Answer:
because the blood in the heart gets what's left of oxygenated blood first. first come first serve concept. the heart cells survive longer because they have oxygenated blood longer and more frequently. if the person is not breathing the oxygen in the blood might run out by transferring to cardiovascular cells before it gets to the brain.
Explanation:
The enzyme DNA polymerase works only in the 5′ to 3′ direction. How does this affect the leading strand and the lagging strand?
A. DNA polymerase can work on both the leading and the lagging strand but is much faster on the leading strand.
B. DNA polymerase can work continuously on the leading strand but works discontinuously on the lagging strand, creating Okazaki fragments.
C. DNA polymerase can use only the leading strand as a template. A different enzyme is used to synthesize DNA on the lagging strand.
D. DNA polymerase can work continuously on the leading strand but must flip the lagging strand around before it can work on it
Answer:
B
Explanation:
DNA replication is semiconservative- meaning the old template strand will form a double helix with the newly synthesized strand. The DNA polymerase can only replicate DNA in the 5’ -> 3’ direction on a DNA strand. However, because the two strands of a DNA double helix run antiparallel (and they are replicated together), then during replication, one strand will be oriented in the opposite direction (i.e 3’ -> 5’ direction).
Because DNA polymerase requires a primer to begin replication, the leading strand will require one primer, because replication on this strand occurs continuously. On the lagging strand, many primers are required because replication is done piecemeal forming fragments called Okazaki fragments. The fragments are later joined by DNA ligases.
DNA polymerase can only add nucleotides in the 5′ to 3′ direction, resulting in continuous synthesis of the leading strand and discontinuous, fragmented synthesis of the lagging strand known as Okazaki fragments.
Explanation:The enzyme DNA polymerase works only in the 5′ to 3′ direction during DNA replication. This specificity affects how both the leading and lagging strands are synthesized. The leading strand is synthesized continuously in the direction of the replication fork because it aligns with the directionality of DNA polymerase. However, the lagging strand is synthesized in a discontinuous manner away from the replication fork, resulting in short stretches of DNA called Okazaki fragments. These fragments are later joined to form a continuous strand by the action of DNA ligase. As such, the correct answer to how DNA polymerase affects the leading and lagging strand is option B: DNA polymerase can work continuously on the leading strand but works discontinuously on the lagging strand, creating Okazaki fragments.
The rapid decomposition of organic matter produces evidence which supports: the slow accumulation of coal deposits long ages of the Earth rapid burial of vast amounts of vegetation Biblical account of Noah's flood
Answer:
rapid burial of vast amounts of vegetation
Explanation:
The organic matter is always decomposing, just that it depends on the conditions at what kind of a rate the decomposition will happen. If the climate is warmer and humid, then the decomposition is very quick. This results in a rapid burial of enormous amounts of vegetation. As the vegetation dies out, it piles up constantly, decomposes very quickly, and if there is something that can cover it, like mud for example, it will be buried in the ground. This is actually how the big deposits of coal have got the basis to form in the Carboniferous period.
The rapid decomposition of organic matter produces evidence which supports:
-rapid burial of vast amounts of vegetation
-Biblical account of Noah's flood
In which process is lactic acid formed when there is not enough oxygen present for cellular respiration to take place?
a. photosystem I
b. ATP synthase
c. fermentation
d. glycolysis
Answer:
Fermentation
Explanation:
To find the correct answer, we will review over the definition of each answer choice.
Photosystem I is A membrane in a plant that produces high levels energy from light
Based on the definition, we can conclude that photosystem 1 is not the correct answer.
ATP Synthase are molecules that create ATP
We know that this answer choice is also not correct.
Glycolysis is the process of breaking down glucose to create energy.
Based on the definition provided we know that this answer choice is also incorrect
Fermentation is the process of lactic acid being formed when there is not enough oxygen present for cellular respiration to take place.
Therefore, fermentation is the correct term we are looking for.
The process in which lactic acid is formed when there is not enough oxygen present for cellular respiration to take place is fermentation. The correct option is c.
What is fermentation?Lactic acid fermentation is a metabolic process that converts glucose or other six-carbon sugars (including disaccharides of six-carbon sugars such as sucrose or lactose) into cellular energy and the metabolite lactate, which is lactic acid in solution.
Lactic acid fermentation is a type of anaerobic respiration (or fermentation) in which sugars are broken down to produce energy in the form of ATP.
Because it occurs in the absence of oxygen, it is referred to as anaerobic. Lactic acid is produced as a byproduct of this reaction, giving rise to the name of this type of fermentation.
Anaerobic respiration occurs when human muscle cells do not receive enough oxygen. As a result, lactic acid fermentation occurs to produce energy molecules. Lactic acid is produced as a byproduct of this process.
Thus, the correct option is c.
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FIFTY POINTS!!!
Blood glucose level is regulated by a feedback loop, shown in the diagram below. People with diabetes either cannot make insulin, or their bodies cannot use insulin properly.
What does the diagram suggest about the effectiveness of the feedback loop at regulating the blood glucose level of diabetics? (image below)
A. It is effective because it allows diabetics to produce insulin.
B. It is effective because it allows diabetics to break down glycogen into glucose.
C. It is ineffective because diabetics will not be able to increase their blood glucose level.
D. It is ineffective because diabetics will not be able to uptake glucose or convert it into lipids or glycogen.
Answer:
its D
Explanation:
20. A comet's tail always points away from the Sun because
Dust; the solar wind pushes the particles away from the comet's head
Ion; the solar wind pulls the particles towards the comet's head
Dust; the solar wind pulls the particles towards the comet's head
Ion; the solar wind pushes the particles away from the comet's head
Answer:
Ion; the solar wind pushes the particles away from the comet's head
Explanation:
Eons are the broadest category of geologic time, and we live in the Phanerozoic eon. The Phanerozoic eon is further divided into eras. What divides the three eras of the Phanerozoic eon?
A. The appearance of carbon on Earth and the appearance of atmospheric oxygen separate the three eras from each other.
B. The development of insects and the development of flying insects separate the three eras from each other.
C. The first life on Earth and the first multicellular life on Earth separate the three eras from each other.
D. Mass extinction events separate the three eras from each other.
Answer:
D. Mass extinction events separate the three eras from each other
Explanation:
The Phanerozoic represents an eon, and it is the most recent one. It is further divided into three eras, Paleozoic, Mesozoic, and Cenozoic. The division between the tree eras is because of mass extinction events. The Paleozoic and Mesozoic era are divided by the Permian-Triassic mass extinctions. The Mesozoic and Cenozoic are divided by the Cretaceous-Paleogene extinction. The Cenozoic era is still in existence, as there hasn't been a mass extinction of a magnitude big enough so far.
Answer:
mass extinction
Explanation:
The somatic cell of a cat contains 38 chromosomes (2n = 38). how many chromosomes and how many dna molecules would the secondary spermatocyte of this cat have?
Answer:
19
Explanation:
The secondary spermatocyte is formed in the process of spermatogenesis that occurs in the testis of the cat. It begins with a germ cell/primary spermatocyte that is diploid, that undergoes meiosis I turning it into a haploid secondary spermatocyte. The secondary spermatocyte then undergoes meiosis II to turn it into spermatids.
Which will cause allergies if you inhale them, eat them, or touch them?
antihistamines
bacteria
allergens
antibodies
The only thing here that is capable of causing allergies is an allergen. Hence the name, it stimulates an immune response to a harmless antigen.
An antihistamine is a substance the prevents the swelling of certain areas of the body due to an increase in histamine production in that area.
An antibody is a type of white blood cell that fights disease.
Bacteria are microscopic organisms that are capable of doing a variety of different things, none of which are pertinent to your question.
I hope I helped!
If you'd like me to elaborate on my response, then just leave a comment down below and I'll gladly do so. :)
(I'll also help you with other topics/questions, if needed).
Answer:
allergens
Explanation:
A biologist is constructing a cladogram to show the evolutionary relationships between the animals shown below. if anatomical features are used to construct the cladogram, which animal will be placed farthest from the animal shown?
Answer:
br4oooooooooooooooooooo its d
Explanation:
A membrane protein that spans the phospholipid bilayer one or more times is _____.
Answer:
The right word to fill the blank space is TRANS MEMBRANE PROTEINS.
Explanation:
Membrane proteins are proteins that are found in the cell membranes of living organisms. There are three major types of membrane proteins, these are integral, peripheral and lipid anchored proteins. These proteins perform diverse functions in the transport of materials in and out of the living cells.
The integral proteins refer to those proteins that are permanently anchored to the cell membranes. Integral proteins are attached to the cells in various ways, some integral proteins are attached to only one side of the membrane and do not span across the whole membranes while some span the whole phospholipid bilayers one or more times. The integral membrane proteins that span the phospholipid bilayer one or more times are called TRANS MEMBRANE PROTEINS.
A membrane protein that spans the phospholipid bilayer one or more times is referred to as an integral or transmembrane protein. These proteins interact with the hydrophobic region of the phospholipid bilayer and can span a part of or the entirety of the membrane. Examples include channel proteins.
Explanation:A membrane protein that spans the phospholipid bilayer one or more times is known as an integral protein or transmembrane protein. These proteins integrate completely into the membrane structure, interacting with the hydrophobic region of the phospholipid bilayer. Some of these proteins span only part of the membrane associating with a single layer, while others stretch from one side of the membrane to the other. They usually have a hydrophobic transmembrane segment that consists of 20-25 amino acids and can be found either on the surface or embedded within the phospholipid bilayer. Examples of such integral proteins include channel proteins, which serve as ion channels.
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The part of the eye that closes and opens to let light in is the________ .
Hello There!
This is called the "IRIS"
The iris is the colored part of they eye and it's responsible for focusing light onto the cornea.
A lizard is blown out to sea during a hurricane. This type of storm occurs very infrequently—on average once every 100 years. The lizard washes up on the beach of a small island. The lizard finds some beetles on the beach.
This Question #12: The lizard can get an average of about 20 calories from consuming a beetle. It takes the lizard 10 calories a minute to chase and catch beetles. What is the maximum amount of time that the lizard can spend catching each beetle and still survive?
2 minutes
6 minutes
10 minutes
20 minutes
It would take the lizard 10.minutes to survive
Transcription occurs in the ____________ of a cell. It starts with (A) ______ _______________ racing along (B)_____ strands looking for _____________ factors that have bound to the (B) at the promoter (another word for the promoter is the (D)__________ box). The (A) attaches to the (B) at the (D) box, which is ____ (#) base pairs upstream from the start of the (E)__________. All (E) start with the sequence _______ in their ________ strand. The (A) pulls the two strands apart, counts to _______(#), and then uses the _________ strand as a template to make a _______-stranded copy of the _______ strand (this new strand is called (F)_______). The only difference between the (F) strand and the ________ strand of (B) is that the (F) replaces __________ with _________. The (F) is further processed by adding a 5’_________ (made of a __________ nucleotide hooked on backwards) and a 3’ ________ ____ tail (made of about 200 ____________ nucleotides) to protect the (F) from _____________. Once the (F) is processed, it moves into the _________________ where translation occurs.
Answer:
I want to die
Explanation:
Describe how ecosystems recover from a disturbance
Answer:
Secondary succession in healthy ecosystems following natural disturbances often reproduces the original community, however ecosystems may not recover from human-caused disturbances. Ecological succession is a series of more-or-less predictable changes that occur in a community over time.
Explanation:
Hello There!
Ecosystems recover from a disturbance by ecological succession.
An "Ecological Succession" is a series of changes that occur in an ecosystem after a type of disturbance. This continues until the balance of the eco system is restored.
What is the key to the recognition of codominance?
How can DNA be useful in phylogeny?
A. DNA sequences are rearranged to predict how species could evolve in the future.
B. DNA sequences from different species can be compared, giving us more information about their evolutionary relationships.
C. DNA from every organism in a clade is sequenced to identify genetic mutations that have occurred.
D. DNA isn't useful in phylogeny, as morphological characteristics are used exclusively in phylogeny.
Answer:
B
Explanation:
By comparing DNA it is possible to look at similarities and differences and allow for the classification of species.
Can nonrenewable resources be used sustainably?
A. No, there's a finite amount of nonrenewable resources
B. Yes, nonrenewable resources are always beneficial for the environment
C. Yes, as long as use doesn't exceed availability
D. No, there are only negative effects of using nonrenewable resources
Answer:
The correct answer is C: Yes, as long as use doesn't exceed availability.
Explanation:
Non- renewable resources cannot be used permanently, but these resources can be used sustain-ably over a period of time to meet their needs. The reason is that these non-renewable resources such as oil, gas, and fossil fuels, are being used at a larger rate, but their production is quite slow beneath the earth surface.
Therefore on the surface, it is not possible to use them sustain-ably except exceeding the limit as they are running out.
For example, in 19th-century whale oil was used to meet the energy needs, but gradually this species became distinct, and its population couldn't be protected and restored by human beings.
A population of bears has genetic diversity. Some of the bears have an allele that gives them
thicker fur. Due to climate change, the winters have gotten colder in their habitat. Now the bears with
thicker fur are becoming more common in the population.
a.) which type of bear is selected for in the coldest ecosystem?
b.) what must be the other allele for the type of fur, and what term would you use to describe the fact that the allele is becoming less common in the colder climate?
c.) describe the change in the bear population in terms of changing allele frequencies and phenotypes
d.) is this an example of natural selection
a) The type of bear that would be selected for the coldest ecosystem would be the one with the thickest fur. Since the climate is changing in this scenario and it is becoming colder, the bears that have the allele for thicker fur would be the ones that would become more dominant through natural selection. The reason for that is that those bears will have an advantageous trait that will have them survive int he changing climate and environment.
b) Apart from the allele for thicker fur, the other allele that will accompany it would be the allele doe longer fur. In this way, by having both longer and thicker fur, the bears would have much better isolation from the cold weather, thus being able to function normally and not die out because of the severe cold. The alleles that would be becoming less common in the colder climate would be the ones for shorter and thinner fur, as they will not be suitable for the living conditions in which the bears have found themselves. These alleles would gradually decline, and that process is called natural selection.
c) As the climate will be getting colder and colder, the bear population will also change. The bears that will have the advantageous alleles will have an advantage over the other bears when it comes to survival. Because of this, they will be the ones that would be preferred for matting, as they will guarantee that the offspring will have those alleles too. The bear population will gradually start to become dominated by the bears with the alleles for longer and thicker fur, while the other bears will be in constant decline.
d) This scenario is an excellent example of natural selection. With the changing climate conditions, not all bears will be able to survive, but mostly it will be the ones with the alleles for thicker and longer fur. Apart from being able to survive without any particular problem, the bears with these alleles will be the ones that will be the preferable mating partners, thus the bears will start to select each other by advantageous traits, and push aside the ones that do not posses them. This is a prime example of how the natural selection works, as by selecting the mating partners, the bears are selecting who survives and who doesn't, gradually changing the population in the advantage of some of them, and disadvantage of the others.
If RR is the genotype for the phenotype of right handedness, what would be the phenotype of rr?
Answer: left handedness
Explanation:
It would be the opposite of RR
being left handed because rr is reccessive and being left handed is less common
A muscle producing almost peak tension during rapid cycles of contraction and relaxation is said to be in
Answer:incomplete tetanus
Explanation:
I think this is the answer you are looking for if you are taking AP class.
A caldera forms when the bottom of the magma chamber that fueled the volcano falls further underground.
Question 1 options:
a) True
b) False
Answer:
True I think?
Explanation:
the formation of a caldera happens by collapse which means it is already at the bottom of the magma chamber.
Answer:
True
Explanation:
When the magma has erupted from a volcano in large amount, the strength of volcano to hold its own weight reduces and hence the volcano collapses into itself thereby forming a cladera . Formation of cladera is triggered when the magma chamber start emptying. With the removal of magma, the center of volcano lying with in the ring fracture collapses.
Hence, the given statement is true.
In the absence of oxygen the net gain of atp for each glucose molecule during glycolysis is approximately __________.
In the absence of oxygen, each glucose molecule during glycolysis undergoes a net gain of two ATP. However, these ATP may be used for other processes such as the transport of NADH, therefore the actual ATP gain can sometimes be effectively zero.
Explanation:During glycolysis, glucose is broken down into two molecules of pyruvate. This process generates four molecules of ATP, but consumes two ATP in the early stages, resulting in a net gain of two ATP for each glucose molecule. However, these ATP molecules may be used for other functions, such as transporting NADH from the cytoplasm into the mitochondria, making the net ATP gain zero under certain conditions.
Under anaerobic conditions, where oxygen is not present, the ATP production is limited to those generated by glycolysis. Hence, the net yield remains as two ATP molecules per glucose molecule.
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What do we call an individual that has inherited two identical alleles for the same trait?
A.homozygous
B.heterozygous
C.monozzygous
Homozygous that has inherited two identical alleles for the same trait. thus option A is correct.
What is an allele?Any of two or more genes that can exist alternately at a specific place (locus) on a chromosome is referred to as an allele. Alleles can be found in pairs, or several alleles might influence the expression (phenotype) of a trait.
At a given gene locus, the occurrence of two identical alleles. Two normal alleles or two alleles with the same variation can make up a homozygous genotype.
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What is the common name for danaus plexippus
Answer:
Monarch
Explanation:
Danaus plexippus is a type of butterfly that is very easily recognizable because of its size and color patters. The common name for this butterfly is monarch. The monarch is probably the most recognizable and most famous butterfly from North America. It tends to live in very large colonies consisting of millions of individuals. These butterflies are pollinators, so they can be seen the most in places where there's lot of plants that should be pollinated. The colors of the monarch make it very easy to spot and very beautiful, having a several different patterns of black, orange, and white color. It is also a migratory butterfly, being in the central and northern parts of the US and southern part of Canada in the summer, and then migrating south toward California, Florida, and Mexico for the colder months.
approximately what portion of the foods that we eat have been genetically modified in some way?
A.fewer than 10%
B.about 50%
C.nearly 100%
Nearly 100% (option C) of the foods we eat have been genetically modified in some way. A significant percentage of crops like soy, corn, and cotton are genetically modified, and about 75% of processed foods contain GMO ingredients. The safety and environmental impact of GMOs remain controversial, and there is a lack of mandatory labeling in the U.S.
Approximately what portion of the foods that we eat have been genetically modified in some way? The answer is nearly 100% (option C). Genetically modified organisms (GMOs) are incredibly common in the US food supply. For instance, a high percentage of crops such as soy (94%), corn (89%), and cotton (91%) have been genetically modified for certain traits like herbicide resistance.
Most processed foods contain ingredients derived from GM crops. For example, products like oil, high fructose corn syrup, and sugar often come from genetically modified crops. As a result, it has been estimated that roughly 75% of processed foods on supermarket shelves contain GMOs. This is a significant indicator of how prevalent GMOs are in our diet.
Despite their prevalence, the safety of GMOs for human consumption and their environmental impact are still under debate. In the United States, labeling of genetically engineered ingredients is not mandatory, making it difficult for consumers to know if their food contains GMOs, unless it is labeled as 'organic' or voluntarily indicated as GM-free by some companies.
Select the correct answer. Patients with severe, uncontrolled diabetes can eventually suffer kidney failure. Jack works in a laboratory that is attempting to grow healthy kidney cells from embryonic cells. From which part of an embryo would Jack derive cells that could eventually become kidney cells? A. Trophoblast B. Mesoderm C. Endoderm D. Ectoderm
Answer: B . Mesoderm
Explanation:
The intermediate mesoderm connects the paraxial mesoderm with the lateral plate, eventually it differentiates into urogenital structures consisting of the kidneys, gonads, their associated ducts, and the adrenal glands.
Answer:
B . Mesoderm
Explanation:
The germ layers begin to develop from the fourth to the seventh week, in this period one has an embryo. All cell types will derive from these layers called ectoderm, mesoderm and endoderm.
Mesoderm which is the middle layer of the embryo forms the dermis, smooth and skeletal muscles, the circulatory system: heart, blood vessels, lymphatic tissue, connective tissue; the skeletal system: bones and cartilage; and the excretory and reproductive system: genitals, kidneys, urethra, bladder and gonads.
what do producers do with the disassembled organic matter found in soil?
A.they break it down into carbon,phosphorus and nitrogen
B.they absorb it to make their own food
C.they break it down to its simplest form
Answer:
B. they absorb it to make their own food
Explanation:
Producers absorb the disassembled organic matter found in soil to make their own food.
Answer:
B.they absorb it to make their own food
Explanation:
Producers are set of ecological organisms that have the ability to synthesize their own food via the process of photosynthesis. However, photosynthesis only produces the plant with organic food used to produce energy. The plant still needs other nutrients in form of elements to grow and develop.
These nutrients such as Nitrogen, Phosphorus etc. are obtained from the soil when decomposers like bacteria, breaks down organic matter releasing nutrients into soil. These nutrients are then absorbed by the roots of plants. The plants uses these nutrients to grow and develop important tissues needed to undergo its primary function of photosynthesis i.e making its own food.
Mark is a 25 year old sedentary male who weighs 250 pounds and is 6'0'. His RDA for protein is 90 grams (based on 0.8g/kg). He wants to gain muscle so he starts to lift weights. Which protein intake listed below would meet his needs now that he is strength training? (Choose the BEST answer.)
Answer:
Im jacked and I eat 90G Protein daily but I only weigh like 135 so if mark weighs 250 id say around 160-170g Protein for our buddy
Explanation:
which of the following is not a benefit of genetically modified foods?
A.pest-resistant crops
B.herbicide-resistant crops
C.plants that do not require water?
Plants that do not require water which is not a benefit of Genetically Modified Foods.
What is Genetically Modified Foods?Genetically modified foods are those foods which is derived from the organism whose DNA is modified which does not occur naturally. This type of food is also known as Genetically engineered foods or Bioengineered foods. In short form, it is also called as GM foods.
Some benefits of Genetically modified foods include:
It make more nutritious foodIt also make tastier foodThese are disease and drought-resistant plantsLess use of pesticides are requiredIt will increased supply of food with reduced cost and longer shelf lifeIt allow plants and animals to grow fasterGenetic engineering is a tool which can be used for a variety of purposes like for growing Pest-resistant crops, herbicide-resistant crops etc.
Thus, Plants that do not require water which is not a benefit of Genetically Modified Foods.
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In the _______ cycle, a virus integrates its DNA into the host's DNA, and its DNA is replicated when the host DNA is replicated.
Answer: In the Lysogenic Cyclecycle, a virus integrates its DNA into the host's DNA...
Explanation:
Viruses are infectious agents of living cells, which cause diseases in animals and plants, and are capable of attacking other lower organisms, even bacteria. They differ from all other living things because they do not have a cellular structure, that is, they are not made up of cells. There are two main types of Bacteriophages viruses: those that make the lytic cycle and lysogenic cycle. When bacteriophages do not destroy their host cells, but, their nucleic acid is integrated into the genome of the host cell, and replicates in the host bacterial cell from one generation to the next without cell lysis. This is the lysogenic cycle.