Answer:
541 million years ago
Explanation:
The Phanerozoic Eon is the most recent eon. It started 541 million years ago, and it still lasts, thus we are living in this eon as well. The Phanerozoic Eon has seen lot of changes, from explosion of the life, to big catastrophic events, big changes in climate, changes in the continents and oceans, and most recently the appearance of the most intelligent species, the humans. Through this period the Earth has been dominated by fish, sinapsids, dinosaurs, mammals, all having their fair share of dominance on the planet. The continents have been constantly on the move, creating supercontinents on multiple occasions, but then falling apart and creating numerous small ones. There has been multiple mass extinctions as well, some caused by intense volcanic activity, some by meteorite impacts.
The chemical breakdown of hydrogen-containing compounds requires an input of energy. true or false
The answer is true if I am correct
Answer:
True
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'-'
Which chamber receives blood from all the body veins
Do you know if there is just 1 answer? I think it is both the left atrium and right atrium.
If just 1 answer, try right atrium
All instructions for proteins, like hemoglobin, are stored in our _______, which is located in a cell’s ______________. This DNA must first be turned into __________, through a process called __________________. This process takes place in the _______________. The _______ then takes the message to the _____________, specifically to a ribosome. This is where the process of ________________ takes place. A tRNA matches its _______ to a _______ on the mRNA. The tRNA then drops off its __________. Many of these monomers make up the final _______________ of hemoglobin.
Answer:
1. DNA
2. Nucleus
3. mRNA
4. Transcription
5. Nucleus
6. mRNA
7. Cytoplasm
8. Ribosome
9. Translation
10. anti-codons
11. codon
12. amino acids
13. protein
Explanation:
Deoxyribonucleic acid or DNA hold all the instructions that make up an organism. It determines the physical structure and even the function of the different cells that make up all organisms.
The DNA are all stored in the NUCLEUS of cells. Typically, eukaryotic cells have a nucleus except red blood cells. The nucleus has a nuclear envelope that keeps the DNA stored inside but it has nuclear pores that allows it to interact with the cytoplasm.
In order for DNA to be replicated, it needs to be turned into messenger RNA, otherwise known as mRNA. The mRNA decodes the DNA in order for the cell to use the code. The process is called transcription.
Transcription is done within the nucleus. Before the cell can understand what to do with DNA, mRNA transcribes to know what information it needs to produce specidic proteins.
Once transcription is done, it will then bring the information out of the nucleus and into the cytoplasm. The cytoplasm is the viscous gel-like solution that holds the organelles of the cell. In the cytoplasm you have ribsomes.
Ribosomes is where protein synthesis takes place, this is why it is called the protein factory of the cell. It is a molecule that is made up of ribosomal RNA, which direct the chemical processes involved in protein synthesis. For protein synthesis to happen, it will need another type of RNA, which is the tRNA.
tRNA is transfer RNA and they translate the mRNA sequence into proteins. tRNA have amino acids attached to it.
Each 3 bases of the mRNA are collectively known as codons. These codons correspond with specific tRNA that hold the anticodons. These anticodons code for specific amino acids that they also hold.
When they pair up, the tRNA drop off the amino acid which form a chain with the other tRNA amino acids that complete the code. These chain of monomers then make the protein specific to the DNA code that was copied in the beginning.
A plant cell uses the molecules in the list to synthesize a protein. What role do the
ATP molecules play in the protein synthesis process?
Answer:
The light reactions of photosynthesis use chemiosmosis to produce ATP that will be used in the Calvin cycle.
Explanation:
ATP is one of the most important compounds inside a cell because it is the energy transport molecule. ATP (Adenosine TriPhosphate) is considered a transporter of energy (photosynthesis) because when one of the phosphate groups is broken off, turning it into Adenosine DiPhosphate (the Tri means 3 phosphate groups, the Di means 2 phosphate groups). When a phosphate breaks off, through chemical reactions in a cell, energy (photosynthesis) is released which the plant uses for cellular processes.
ATP molecules provide the energy necessary for protein synthesis, enabling the formation of peptide bonds and the loading of amino acids onto tRNA. It also supports the ribosomal movements during translation. ATP is a critical energy source for cellular functions and protein synthesis cannot occur without it.
The ATP molecules play a crucial role in protein synthesis by providing the energy required for various steps of the process. Protein synthesis, specifically during translation, involves decoding an mRNA message into a polypeptide chain, where amino acids are covalently linked by peptide bonds.
ATP is essential as it supplies the biological energy needed for forming these bonds, as well as for other processes such as loading the amino acids onto tRNA molecules, and driving the conformational changes of the ribosome and associated factors that enable the synthesis to proceed.
ATP releases energy when its phosphate bonds are hydrolyzed, which is then used to power the tRNA charging and the ribosomal movements during synthesis. This makes ATP an indispensable molecule in the high-energy-demanding process of protein synthesis. In summary, without ATP, the complex machinery that orchestrates protein synthesis would not have the energy to perform its task, thereby inhibiting the formation of proteins.
Name three factors that are important in promoting venous return
1.The presence of valves 2.the milking action of skeletal muscles 3. the veins as the muscles contract
Venous return is the rate of back flow of blood to the heart. It mainly depends upon the factors such as blood volume, blood pressure, and the cardiac suction.
What is Venous return?Venous return is the rate at which blood flows back to the heart. It limits the cardiac output. Superposition of the cardiac function curve in an organism and venous return curve are used in hemodynamic model preparation.
Peripheral venous pressure is the pressure in the peripheral veins of the body which drains the body organs and tissues. It is the pressure differential between the peripheral and central veins which determines the venous return.
Venous return is facilitated by a number of different factors, including inspiration, increased blood volume, cardiac suction effect, the presence of venous valves and the skeletal muscle pump of the body.
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Single strand as a template plus 3 prime end to start DNA synthesis. A diagram shows a template strand of DNA as a sequence of bases. On the 3 prime end is an OH. A 3-base primer is attached to the 3 prime end of the DNA template via complementary base pairing; the 5 prime end of the primer lines up with the 3 prime end of the template DNA. An OH is also on the 3 prime end of the primer. Toward the 5 prime end of the DNA template, polymerase works, and DNA synthesis proceeds. The template DNA sequence is (3 prime to 5 prime): G A A T C T G C T G; the primer attached to the three prime end of the template reads (5 prime to 3 prime): C T T. Refer to the figure associated with this question. What bases will be added to the primer as DNA replication proceeds? The bases should appear in the new strand in the order that they will be added starting at the 3' end of the primer.
Cttagacgac is the answer
During which year does one of the projections show the human population reaching carrying capacity?
A. 2045
B. 2020
C. 1960
D. 2080
A 2045 would be the year we would reach capacity
Answer:
The correct answer is option A. "2045".
Explanation:
Many environmental scientist have the projection that the Earth has a maximum carrying capacity of 9 billion to 10 billion people, which would mean that at the point the resources of the Earth would start to decline. By 2045 it is projected that global population will reach nine billion people, therefore, it is believed that by that year the human population would reach its carrying capacity.
What does a monofill store? (Select the best answer.)
Question 1 options:
One specific type of waste
Objects that can be downcycled
Expensive items
New technology
Answer:
New technology
Explanation:
I do not think it would be the other ones
A monofill is designed to store a single type of waste, typically industrial. It does not store downcycled items, expensive items, or technology.
Explanation:A monofill is a type of landfill that is specialized in storing a single type of waste. It does not store downcycled objects, expensive items, or new technology, these are common misconceptions due to the nature of the terminology. Monofill facilities are commonly used for industrial waste disposal where a specific type of waste such as coal ash, dredged material, or construction debris needs containment.
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Cesium is a radioactive element which was released into the ocean after the Fuushima nuclear power plant meltdown in 2011. Cesium's half-life is 30 years, which means that for every unit of cesium, half of it will decay over 30 years. How does this affect the human populations that eat fish from this area?
A.) Cesium's half-life is relatively long, so biomagnification could become a concern.
B.) All of the cesium will decay in approximately thirty years; therefore, humans can just avoid eating the contaminated fish for thirty years.
C.) Cesium levels will be acceptable in a short time, so biomagnification is not a concern and humans can eat fish as normal.
D.) Cesium will only decay by half in fifteen years, so human populations should avoid eating fish in this area and avoid contamination
Answer: Option A
Explanation:
A cesium's half life is relatively long( 30 years) which is quite a long period. This element can enter the food chain of the marine ecosystem and can lead to biomagnification.
Bio magnification can be defined as the phenomenon in which there is an increases in the toxic concentration as we move up in the food chain.
Cesium can enter into plankton and form there the concentration of cesium will increase as we will move towards the upper side of the food chain.
The process of gene cloning involves the transfer of what between organisms?
Answer:
Part of DNA (genetic material)
Explanation:
DNA cloning, as a method in molecular biology, is used for the multiplication of gene (or other piece of DNA). It usually includes steps of DNA insertion into plasmid (prokaryotic circular piece of DNA). That plasmid is than introduced into bacteria via process called transformation.
My boss isn't willing to increase the number of vacation days we get each year. that means she doesn't care about our health. it's wrong not to care about employees' health. she should be replaced with someone who cares about employees' health."
Talk to someone higher than her in status in the job?
Final answer:
Decisions about vacation policies involve various factors; it is not solely a measure of how much employers care about employee health. Supporting employees in work-life balance and understanding the implications of workplace health is becoming increasingly important in modern businesses. Engagement and support from supervisors are crucial in encouraging employees to take their allotted time off.
Explanation:
The assertion that a boss who is not willing to increase the number of vacation days does not care about employee health may not be entirely accurate. There are various factors influencing decisions around employee benefits beyond just caring for employee well-being. However, it is true that there is a growing understanding in the business community about the importance of employee health and work-life balance.
In 2015, according to Project Time-Off, 55% of U.S. workers did not use all of their paid vacation time and as a result, a staggering 658 million vacation days were lost. Businesses are beginning to recognize that unhealthy habits like smoking or being overweight increase health care costs, which in turn affect the company's bottom line. Companies seek to motivate employees to work hard, be productive, behave ethically, and stay healthy. Managers, like your boss, who seek suggestions to make it easier for employees to balance work and nonwork demands, are taking steps towards valuing employee health. The pressures of workload, job security, and affordability of vacations contribute to the hesitance to take time off.
The notion that someone should be replaced for not increasing vacation days is a matter of company policy and employee negotiation. It is important to note that the feeling of support from supervisors can significantly influence an employee's decision to take that much-needed time off.
The principal hormone secreted by the corpus luteum is
The main hormone secreted by the corpus luteum, a temporary gland in the ovaries, is progesterone. It readies the uterus for possible pregnancy and sustains it if fertilization occurs.
Explanation:The principal hormone secreted by the corpus luteum is progesterone. The corpus luteum is a temporary gland formed in the ovaries following the release of an egg during the menstrual cycle. Its main function is to secrete progesterone to prepare the uterus for a potential pregnancy. If no fertilization occurs, the corpus luteum degenerates, leading to a decrease in progesterone levels and the start of menstruation. Progesterone plays a vital role in maintaining the health of the pregnancy as well as preparing the body for childbirth.
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The corpus luteum, that develops post ovulation, primarily secretes progesterone. This hormone is vital for pregnancy as it supports endometrium development and halts formation of new ovarian follicles. It also inhibits GnRH, FSH, and LH production.
Explanation:The corpus luteum is an endocrine structure that develops in an ovarian follicle post ovulation. The principal hormone it secretes is progesterone. This hormone plays a critical role for the establishment and maintenance of pregnancy as it aids in further development of the endometrium and prevents new ovarian follicles from developing. In addition, progesterone inhibits the production of GnRH, LH, and FSH, which also helps maintain pregnancy. If pregnancy does not occur, progesterone levels decrease, causing the stratum functionals to slough off - a process we recognize as menstruation.
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Identify the organ in the digestive system responsible for producing bile, and for detoxifying molecules absorbed from the digestive system into the blood.
gallbladder
pancreas
duodenum
liver
Answer:
Liver
Explanation:
The liver produces bile and detoxifies the body.
Answer: Liver
Explanation: The liver's main job is to filter the blood coming from the digestive tract, before it is distributed to the rest of the body. The liver also detoxifies chemicals and metabolizes drugs. when it does this, the liver secretes bile that ends up back in the intestines.
A small town in New Mexico discovers that a chemical plant outside of town recently learned that one of their underground pipelines had broken without their knowledge and had been leaking a toxic organic compound for over a month. The spill occurred 5m below the surface in a sandstone above a thin shale bed in the local bedrock. The beds are flat lying and this shale crops out 200m from the chemical plant. The town gets is water from deep wells, about 300m deep. What should the town worry about from this spill?
The major concern for the town in the described scenario is that the freshwater they use from the wells may get polluted by toxic organic compounds that will make the water unsafe and dangerous for usage. The toxic organic compounds have been released for a whole month bellow the surface in a sandstone layer. The sandstone is very easy to penetrate through, so the toxic matter will easily go down through it. As it reaches the lower layers, the shale bedrock comes as the only barrier between it and the freshwater used from the wells. The shale is a soft sedimentary rock, so with enough accumulation of the toxic organic compound it will soon have cracks and the toxic matter will reach the water. Once it mixes with the water, it will pollute it, thus making the deep wells unusable, and the people from the town will be left without their primary source of freshwater which can turn into a catastrophe.
Protist arent monophyletic meaning that they don’t a)have one chromosome b)share one common ancestor that isn’t also shared by organisms in other groups c) Live their lifespan in one place but instead can move d) have one mode of reproduction
B. They don’t share ancestors with other organism in the same grouping. Protists belong in a paraphyletic group
Answer:
The correct answer is option B.
Explanation:
Protists are not monophyletic, meaning that they did not represent a single, whole branch of the common life form.
A paraphyletic group is the group of some descendants of a common ancestor. Protists are considered a paraphyletic group.
Example of the monophyletic group is mammals as each and every mammal share a common single ancestor that is not shared by another group of organism.
Thus, the correct answer is option B.
This organelle conducts respiration for the cell. It is also called the powerhouse of the cell. What is this organelle?
Answer:
Mitochondrion
Explanation:
Mitochondria are membrane-bound organelles of eukaryotic cells that generate power by converting energy into forms that are usable by the cell during the process of cellular respiration (Krebs cycle and electron transport chain with oxidative phosphorilation). The energy in the form of ATP that is produced within mitochondrion is required to perform many processes of the cell such as cell division, growth, and cell death.
Mitochondria have oval shape and are enveloped by a double membrane, outer and inner membrane. The inner membrane is folded creating structures known as cristae. Mitochondria are organelles that contain their own DNA-mitochondrial genome.
The energy that excites the photosystems is supplied by
Answer:Light energy enters the process of photosynthesis when pigments absorb the light. In plants, pigment molecules absorb only visible light for photosynthesis. The visible light seen by humans as white light actually exists in a rainbow of colors. Certain objects, such as a prism or a drop of water, disperse white light to reveal these colors to the human eye. The visible light portion of the electromagnetic spectrum is perceived by the human eye as a rainbow of colors, with violet and blue having shorter wavelengths and, therefore, higher energy. At the other end of the spectrum toward red, the wavelengths are longer and have lower energy.
Final answer:
Light supplies the energy that excites chlorophyll molecules in photosystems during the process of photosynthesis. This energy transfer initiates electron excitation necessary for the light-dependent reactions, with electrons in Photosystem II being sourced from the splitting of water.
Explanation:
The energy that excites the photosystems is supplied by light. In the process of photosynthesis, light energy is captured by chlorophyll molecules within the photosystems. Specifically, photons are absorbed by chlorophyll, which then transfers the energy to the primary electron acceptor. This energy then excites electrons, which in Photosystem II are sourced from the splitting of water, resulting in the release of oxygen. In Photosystem I, the excited electron comes from the chloroplast electron transport chain. Both photosystems, which contain a light-harvesting complex and a reaction center, absorb different wavelengths of light and are involved in different stages of the light-dependent reactions of photosynthesis.
A protein may consist of as many as _____ amino acid molecules.
a)500
b)2,000
c)5,000
d)48
2000 is right answer if not sorry
A protein may consist of as many as 5,000 amino acid molecules.
Answer:c
Atoms with certain characteristics are radioactive. which of those below will always be radioactive?
Answer:
All atoms with an atomic number over 83
Explanation:
The electromagnetic repulsion of the protons in the nucleus is overcome by strong nuclear forces that keep the nuclear particles together. However, as the atomic number gets bigger so does the size of the nucleus. Therefore, the repulsive electromagnetic forces become greater than the nuclear forces hence the atom becomes unstable. Instability of the nucleus means the atoms become naturally radioactive.
Answer:
B.
all atoms with an atomic number under 40
Explanation:
just did it
Some transcription signals are located thousands of base pairs upstream of the gene they regulate. How does the distant signal initiate transcription? (2 points) Activation of the transcription signal releases a secondary messenger that binds to the start codon and initiates transcription. Long regions of DNA can loop over to enable regulatory connections. The distance between the transcription signal and the gene allows for preprogrammed delays in the start of transcription. The region between the transcription signal and the gene is an exon that is spliced out following activation of the transcription signal.
Answer:
Long regions of DNA can loop over to enable regulatory connections.
Explanation:
Transcriptional factors (such as activators or repressors) are proteins that regulate gene expression by binding to DNA sequence (such as enhancers and silencers). Consequently, gene transcription might be turned on or off. Usually binding sites are located near the promoter (initiation of transcription). But when they are located far from the gene they regulate DNA flexibility plays a role. Formed DNA loops bring together binding sites and transcription factors.
In which way is biomass similar to fossil fuels?
Answer:Biomass includes wood and food crops such as sugarcane and corn, and also byproducts such as agricultural waste
Fossil fuels (coal, oil and natural gas) have played and continue to play a major role in transforming the world from an agricultural society to the modern industrial world we live in today. Fossil fuels produce electricity, and fuels for heating and transportation. They also provide petrochemicals used in industrial products and plastics.
Explanation:
Answer:
the answer is corn
Explanation:
Hope this helps ap 3x
In horses, a black coat is dominant to a brown coat (B = black, b = brown). Long legs are dominant to short legs (L = long, l = short). A black short-legged horse is crossed with a brown long-legged horse. The offspring of the cross is a brown short-legged horse.
a) Identify the genotypes of all three horses.
Answer:
Bb ll for the black short-legged horse
bb Ll for the brown long-legged horse
bb ll for the offspring
Explanation:
In order for the offspring to have the two recessive traits, the parents must have been carrying the recessive genes on at least 1 allele. The first horse is black, but it must have a little b for the offspring to gain a little b from it. The second horse and the offspring are brown, so they must both have two little b's. The same goes for the length of the legs. The first horse and offspring must have two little l's because they have short legs and the second horse must have 1 little l in order for the offspring to inherit 1.
The genotypes of the horses are as follows: the black short-legged horse is Bbll, the brown long-legged horse is bbLl, and the brown short-legged offspring is bbll. These genotypes reflect the recessive nature of the brown coat and short legs phenotype in the offspring.
The genotypes of the three horses involved in the cross can be determined based on the given phenotypes and the known patterns of inheritance for coat color and leg length in horses. A black coat is dominant (B) over a brown coat (b), and long legs are dominant (L) over short legs (l). Here's how the genotypes can be identified:
The offspring is brown with short legs, indicating a recessive phenotype for both traits. Therefore, its genotype must be bbll.The offspring can only get one set of alleles from each parent. Since it is bb for coat color, each parent must have contributed one b allele.The black short-legged parent must be Bbll, having one dominant allele for coat color and two recessive alleles for leg length.The brown long-legged parent must be bbLl, having two recessive alleles for coat color and being heterozygous for leg length.Summary of Genotypes:
Black short-legged horse: BbllBrown long-legged horse: bbLlOffspring (brown short-legged horse): bbllA surgical procedure where two tiny holes are drilled into the skull and electrodes are implanted in the brain is called _____.
Electric shock therapy
Answer:
Deep brain Stimulation
Explanation:
Which is an example of a vestigial structure?
a. fish gills
b. human arm
c. raccoon tail
d. whale pelvis bone
Answer:D. Whale Pelvis Bone
Explanation:Structures that have no apparent function and appear to be residual parts from a past ancestor are called vestigial structures.
Examples of vestigial structures include the human appendix, the pelvic bone of a snake, and the wings of flightless birds. Hope this helps
Answer:
Whale Pelvis Bone
Explanation:
Apex...
Driving too fast for conditions or exceeding the posted speed limit can kill you.
a. true
b. false
The answer is true
This driver error was the cause, 21 percent occurred from going too fast for road conditions. Speeding also increases the likelihood that a crash will result in injury. ... Teens driving 40 mph in a 30 mph zone may think they're “only” going 10 mph over the posted speed limit.
The answer is A true because you can get in a really bad accident
Bioinformatics includes all of the following except __________.
Answer:The correct option is C.
Explanation: The options attached to this question are given below:
A) Using computer programs to align DNA sequences.
B) Analyzing protein interactions in a species.
C) Using molecular biology to provide biological information to a system so that it gets expressed.
D) Development of computer-based tools for genome analysis.
E) Use of mathematical tools to make sense of biological systems.
Bioinformatic is an interdisciplinary field that deals with the collection and analyzing of complex biological information. Bioinformatic is useful for many reasons. For instance, in molecular biology, bioinformatic technique makes it possible for scientists to extract useful information from very large complex data. Bioinformatic techniques can be used to carry out all the processes given in the options with the exception of option C.
A DNA molecule has the sequence GCATCCGA. What is the mRNA sequence resulting for this DNA code ?
A. CCTAGGCT
B. CGTAGGCT
C. CGUAGGCU
D. GCATCCGA
Answer:
the answer would be C
Explanation:
the letters are just the oppiste except for A and U
What structure receives blood from the efferent arteriole of a juxtamedullary nephron?
Answer:
The glomerulus.
Explanation:
The glomerulus receives blood from the efferent arteriole of a juxtamedullary nephron. It is also, the network known as a tuft, of filtering capillaries, located at the vascular pole, of the renal corpuscle, in Bowman's capsule. Each glomerulus, receives its blood supply, from an afferent arteriole, of the renal circulation. This is the correct answer to this question.
Hope this helps!!!
Kyle.
The efferent arteriole of a juxtamedullary nephron supplies blood to the vasa recta, which is a network of peritubular capillaries that surrounds the loop of Henle in a juxtamedullary nephron.
Explanation:The structure that receives blood from the efferent arteriole of a juxtamedullary nephron is called the vasa recta. This peritubular capillary network surrounds and interacts with the nephron. The efferent arteriole exits the glomerulus and forms this capillary network. In juxtamedullary nephrons specifically, this peritubular capillary network forms a network around the loop of Henle, hence known as vasa recta. These peritubular capillaries, including vasa recta, play a crucial role in reabsorption and secretion processes during urine formation.
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Name one plant, and how it is useful to our world today.
Answer:
money plant
Explanation:
it produces air back in to oxygen. and it also feeds insects.
well I would say Earth
Our existing knowledge of astronomy is essential for these reasons (and many more):
Navigation.
Chronology.
Predicting tides.
Weather prediction.
Communication (think satellites).
Our current and future pursuit of astronomy is important for these reasons (and many more):
To better predict the weather.
To equip ourselves to deal with potentially disastrous collisions in the future.
To predict potential disruptions to communication, etc. caused by sunspot activity and solar flares.
To improve our scientific understanding of the nature of reality by observing the effects of extreme conditions (e.g. black holes).
To understand how to colonise other planets if we need to.
To understand better how life began on this planet, and the diversity of forms it may take in general.
hope this helps :)
In the winter of 1980, a chemical, toxic and fatal to prey but not to the predator, is introduced into the environment; the subsequent effect to the predator will be
Answer:
An interaction that benefits one species but has little or no effect on the other ... **Predators also use chemical warfare to attack ex. venom ... toxic or stinging prey species which are brightly colored advertising that help .... Factors that can kill members of a population while not dependent on the density of population
The population of prey will get decreased due to the use of toxic chemicals that are fatal to them.
The decreased population of prey will negatively impact predators.
Predators population will also get decreased due to lack of prey population and the relationship between predator-prey will get interrupted.
What is predator- prey relationship?It refers to the interaction between two species where one species fed on another species.
The predator is an organism that eats another organism.
The prey is an organism that is being hunted.
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