There are trillions of cells within the human body, many of which are specilalized to perform specific functions. Red blood cells contain no nucleus or other organelles so allowing room for the oxygen carrying haemoglobin, smooth muscle cells are elongated and can shorten to allow for muscle contraction. Within all cells (except the RBCs) are organelles such as the nucleus and mitochondrion, and these organelles perform functions that are essential to life.
Answer:
The tail allows it to travel to the egg.
Explanation:
The structure of the sperm is divided into three parts head, body and tail. The head region consists of many enzymes and the tail region of the sperm helps in providing mobility to the sperm.
The structure of tail adds propelling movement by whipping and undulating the sperm. The sperm moves through the reproductive tract to reach the egg.
how long can a rat live without food
Answer:
Rats can survive several days without food but only 48 hours without water.
Explanation:
Also, for anyone who didn't know this, rats eat even when they are not hungry. So, if you feed them constantly, they will eat constantly
It's very likely that most would survive for a week but no more than two weeks, without having anything to eat.
the forrested areas of new england today resemble this satellite image of a connecticut location. rapid population growth directly impacts biodiversity on Earth by ALL BUT one of these issues. That is
Answer:
The correct answer is D.) fossil fuel consumption
Explanation:
Answer: The correct answer is D
how does bacterial resistance illustrate evolution in action in modern times.
The bacterial resistance is a perfect example of how the evolution works, though it is much quicker between the bacteria than it is at the bigger and more complicated life forms. Since the modern medicine has started to be used, lot of medications have been used to kill the bacteria in order to prevent or cure diseases among the people. It has been noticed though that the bacteria needs very short period to adjust to the medications so that they are harmless to it, thus developing resistance. This is a nice example of how the bacteria is evolving in order to be able to survive and thrive in a new environment where there's something that destroys it, thus it is developing advantageous traits to be able to survive.
How does overtillage harm soil?
a.
Overtillage can increase the rate of humus decomposition.
b.
Overtillage can increase the water carrying capacity of soil.
c.
Overtillage can result in increased soil compaction.
d.
Overtillage can increase the organic material in soil.
Answer:
A. Overtillage can increase the rate of humus decomposition
Explanation:
We refer to humus as any material of an organic nature that undergoes soil degradation. Humus is very important for agriculture because it has high nutrient levels that it provides to all crops. This causes more crop productivity, increases the producer's profit and increases the number of food available to the population.
Humus is a difficult to decompose material, but under favorable conditions it can decompose quite easily. Due to the presence of large amount of burnt organic matter in the soil, it is sometimes difficult to increase the humus content, so the exhaustion of this organic matter is caused by over tillage, especially in regions of tropical and sub-tropical climate, poorly managed. farmer protection and unprotected effects of erosion.
Answer:
A
Explanation:
overtillage can increase the rate of humus decomposition
rhizobium bacteria are important in soil fertility because plants
Rhizobium bacteria fix nitrogen after becoming established inside the root nodules of plants(such as legumes)
Answer:
Rhizobia are soil bacteria that have the ability to do just that - convert nitrogen into ammonia. They multiply and form nodules attached to the plant roots of leguminous plants such as peas and beans. There are multiple species of rhizobia and not all can form nodules in all leguminous plants.
Hoped i helped lol
Explanation:
At the tip of each bronchiole is _____. - the epiglottis - alveoli -bronchi -the trachea
Answer:
At the tip of each bronchiole is Alveoli.
Explanation:
In respiratory system Bronchiole are an important part. They function as a passage for the transport of air coming from the nose and mouth towards alveoli. Smooth muscles present in Bronchiole control the air flow by contraction and relaxation. At the tip of each Bronchiole air sacs called Alveoli are present. The function of alveoli is to exchange oxygen and carbon dioxide to and from blood.
Answer:
alveoli
Explanation:
What type of RNA is a major component of the structure at which protein synthesis occurs?
A. Transfer RNA
B. Ribosomal RNA
C. Messenger RNA
D. Nuclear RNA
Answer:
Answer is A because of The Messenger RNA (mRNA) molecules carry the coding sequences for protein synthesis and are called transcripts; ribosomal RNA (rRNA) molecules form the core of a cell's ribosomes (the structures in which protein synthesis takes place); and transfer RNA (tRNA) molecules carry amino acids to the ribosomes during protein ...
Explanation:
Ribosomal RNA (rRNA) is integral to protein synthesis as it makes up the structure of ribosomes, aligns mRNA, and catalyzes peptide bond formation.
Explanation:The type of RNA that is a major component of the structure at which protein synthesis occurs is ribosomal RNA (rRNA). rRNA is not only a structural component of ribosomes, but it also has enzymatic functions. It is essential for the proper alignment of messenger RNA (mRNA) and ribosomes, and it catalyzes the formation of peptide bonds between amino acids during protein synthesis. This makes rRNA indispensable in the translation process where proteins are synthesized according to the code carried by mRNA.
Which is a difference between a compound light microscope and a scanning electron microscope?
A.The scanning electron microscope can view the internal part of a cell, while the compound light microscope views the surface of a cell.
B.The scanning electron microscope specimens can be stained for contrast, while the compound light microscope specimen appears black and white.
C.The scanning electron microscope is used for dissections, while the compound light microscope is not.
D.The scanning electron microscope uses an electron beam and a layer of gold to view the surface of the cell, while the compound light microscope uses light and lenses.
I need the answer right away please.
Answer:
The answer is D.The scanning electron microscope uses an electron beam and a layer of gold to view the surface of the cell, while the compound light microscope uses light and lenses.
Explanation:
Electron microscopes use an electron beam instead of a light beam to form an image, so they can only offer black and white images; while the compound microscope is based on optical lenses, which is also known as a light microscope; It has a lens system that focuses the light from the source towards the small point of the specimen.
The difference between a compound light microscope and a scanning electron microscope is: D. The scanning electron microscope uses an electron beam and a layer of gold to view the surface of the cell, while the compound light microscope uses light and lenses.
A microscope can be defined as an optical device that is typically used to make an enlarged (magnified) image of a minute (small) object in order to reveal all the littlest information about the object that cannot be seen by the natural human eye.
Generally, there are different types of microscopes and these include;
Inverted microscope.Polarizing microscope.Compound light microscope.Scanning electron microscope.A compound light microscope refers to an upright microscope that has more than one lens and a visible light source to enlarge an image of a small object.
On the other hand, a scanning electron microscope is a type of microscope that is designed to have a focused high-energy electron beam and a layer of gold to scan the surface of a specimen.
In conclusion, difference between a compound light microscope and a scanning electron microscope is that the former uses light and multiple lenses while the latter uses an electron beam and a layer of gold to view the surface of a specimen.
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Compared to the mid-ocean ridge, sediment near the continents is: thicker thinner older the same
Answer:
older
Explanation:
thick & thin sediments are formed on old and younger crust. the sediments formed in the oceanic ridge are young, so their thickness is less than the thickness of sediments in the continental regions. also, the continental regions are near to lithogenous sediment, therefore they consists of thick sediment deposits formed since ages.
Sediment near the continents is thicker compared to the mid-ocean ridge due to the longer accumulation period and the proximity to the source of sediments, which is the erosion of continental material.
Compared to the mid-ocean ridge, sediment near the continents is thicker. This makes sense considering the geological processes at play. The oceanic crust is constantly being created at mid-ocean ridges through the process of sea-floor spreading. As the newly formed crust moves away from the ridge, more time is available for sediment to accumulate on top of it. The sediments near the mid-ocean ridges are thinner because this area is geologically younger and has had less time for sediment deposition. In contrast, sediments adjacent to the continents can be much thicker, as they often consist of eroded material from the continent itself, and they have accumulated over a much longer period, given that continental crust can be billions of years old.
Identify each of the following molecules as reactants or products of the Krebs cycle.
Answer:
Reactants: Acetyl CoA, NAD+, FAD
Products: Carbon dioxide, NADH, FADH2
Explanation:
Krebs cycle is the second stage of aerobic cellular respiration. Pyruvate enters the Krebs cycle as acetyl CoA. Decarboxylation of acetylCoA during Krebs cycle forms CO2 and H2O. The redox reactions of the cycle forms NADH and FADH2 which in turn enter the oxidative phosphorylation to drive ATP synthesis.
The reactant in the Krebs cycle is Acetyl CoA, and the products are carbon dioxide, NADH, FADH2, and ATP or GTP.
Explanation:The Krebs cycle, also known as the citric acid cycle or TCA cycle, is a central metabolic pathway that occurs in the mitochondria of eukaryotic cells. It oxidizes acetyl-CoA derived from carbohydrates, fats, and proteins, producing ATP, NADH, FADH2, and carbon dioxide while facilitating the release of stored energy for cellular processes. The molecules that are products of the Krebs cycle are:
Carbon dioxideNADHFADH2ATP or GTPThe reactant in the Krebs cycle is:
Acetyl CoALearn more about Reactants and products of the Krebs cycle here:https://brainly.com/question/17928326
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Many industries rely on coal production. Among the fossil fuels, coal is the most widely used fuel in
Answer:
Electricity generation
Explanation:
Coal is burnt to release high amount of energy which is further used to convert water into steam. The steam produced turns the turbines thus generating electricity.
Answer: Coal is most widely used in generating electricity.
Explanation:
Many industries rely on coal production. Among the fossil fuels, coal is the most widely used fuel in generating electricity.
As coal is known for thermal energy.
When coal is heated , it turns water into stream and that stream makes the turbine move to generate electricity.
Hence, among the fossil fuels, coal is the best in generating electricity.
Both food webs and energy pyramids show relationships between organisms in an ecosystem. A pyramid is preferred when showing the
amount of energy transferred from one group to another.
amount of light energy needed by primary producers.
amount of heat energy used by organisms at each level.
individual feeding relationships between organisms.
Answer:
individual feeding relationships between organisms.
Explanation:
When we try to explain the abundance accumulated by each link in the food chain, it can be observed that both the magnitude of individuals and biomass decrease rapidly from plants to predators. By sorting the information in this way, we get a graph in the form of a "pyramid".
Which is a sex-linked recessive disorder that could be represented by the pedigree chart?
Answer:
The answer is hemophila.
Answer:
A. hemophilia
Explanation:
A normal polypeptide includes the following sequence of amino acids(Note:Each amino acid is named by a three-letter abbreviation.)
Iso-Leu-Pro-Val-His-Ser-Thr-Met
After a mutation, the amino acid sequence becomes the following:
Iso-Leu-Pro-Val-Tyr-Arg-Iso-Gly
Which of the following changes to a nitrogenous base in mRNA is most likely to have occured?
a. A cytosine(C) was replaced with uracil(U).
b. A uracil(U) was replaced with a thymine(T)
c. An adenine( A) was removed and not replaced
d. The codon ACU was removed and not replaced
Answer:
C
Explanation:
The mutation seen is most likely due to a frameshift mutation. A nucleotide was added or removed without replacement. This shifted the codon reading sequence by one nucleotide. Therefore the codon downstream of the mutation will code for different amino acids.
Answer:
C
Explanation:
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Which food or drink item is a homogeneous mixture?
A. A handful of trail mix
B. A tossed salad
C. A cup of black coffee
D. A bowl of cereal with milk
the correct answer would be C. Coffee is a homogenous mixture.
A cup of black coffee is a homogenous mixture.
Answer: Option C
Explanation:
The mixture in which the solvent and solution present cannot be distinguished from one another as they are uniformly distributed and it is called as homogenous mixture.
In case of heterogeneous mixture it is very easy to identify the component present in it. Among the mixtures given in the options, a cup of black coffee is homogenous mixture as the components present are not differentiated.
what advantages did sweat glands and less body hair provide in our ancestors environment?
Early man were mainly hunters and gatherers. These tasks were extraneous hence demanded a lot of energy. The body required to lose some heat expended during high cellular respiration (such as during hunting). Therefore, sweat glands and less body hair allowed for heat to lost effectively collagen the body to homeostatic temperatures.
Why are people on the donor list given a lung allocation score and which factor has been eliminated as a reason for a transplant?
Answer:
A score is assigned to you called the LAS. The LAS is used to help direct donated organs to people who would most benefit from a transplant. Your score is determined by calculating the patients age, oxygen requirement, pulmonary function test results, distance walked in 6 minutes, and the type of lung disease the patient has.
Explanation:
Answer:
The LAS determines who would benefit most from a transplant.
The LAS is based on age, oxygen requirement, pulmonary function and the distance walked in 6 minutes.
The amount of time on the donor list is no longer a factor in determining need.
Explanation:
A 6th grader begins to make his sandwich for lunch. There are two loaves of bread in the pantry. When he opens the first loaf, he notices a growth of mold on the first slice on bread. When he opens the second loaf, all of the slices are mold-free. What can he infer about the two loaves of bread?
Answer:
It has been exposed to something fungal.
Explanation:
Answer: The first slice of bread might have been exposed to the outer environment is infected with fungus.
Explanation:
The fungus appear on the surface of bread that may be left open in the normal conditions. The spores of fungus germinate form hyphae that beings to grow on the bread by absorbing all the nutrients from the bread.
The other loafs of bread is not contaminated because it was packed well and no moisture reached there inside the packed.
hence, only the first loaf was infected by fungus and others were not infected.
What is the main difference between primary and secondary succession?
Primary succession is the process in which plants and animals first colonize a barren habitat. Secondary succession differs from primary succession in that it begins after a major disturbance—such as a devastating flood, wildfire, landslide, lava flow, or human activity (farming, road or building construction, or the like)—wipes away part of a landscape.
Answer:
Primary succession occurs on barren land, and secondary succession occurs where soil is present.
Explanation:
Primary succession occurs on barren land. This process generally begins with soil production. Fungus and lichens colonize bare rock, secrete acid, and break down the rock into sediments. Then, pioneer species move in and continue to alter the environment. The process of primary succession is very slow and could take thousands of years to reach a climax community.
Secondary succession occurs where soil is present. This process is caused by a local disturbance, such as a forest fire, that causes an ecological set back. Since it begins with soil and organisms are already present, secondary succession takes less time than primary succession.
African penguins, which inhabit the coasts of southern Africa, were classified as an endangered species in 2010. Two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. Overfishing depletes the food supply of African penguins.
The best method to reduce the threat of overfishing would be to____
1. Construct a corridor to connect penguins and fish
2. Limit the harvest of particualr fish species
3. perform a population survey on several fish species
The risk of oil spills could be reduced by increasing the use of
1. Natural resoureces
2. Renewable energy sources
3. Nonrenewable energy sources
, which should help______ oil consumption
1. Increase
2. Decrease
. If an oil spill does occur, __________ could be used to help remove the oil so the ecosystem may more quickly recover.
1. Bioremediation
2.reforesation
3. recyclng
Answer:
The correct answer to the first question is 2. Limit the harvest of particular fish species
-By limiting the harvest of the fish that penguins feed on will increase the biomass of that fish and the increased biomass of that particular fish can support the higher population of penguins.
The correct answer to the second question is -2. Renewable energy sources.
-Use of renewable source like solar energy reduce the pressure on the use of fossil fuels therefore it also decrease the risk of oil spills.
The correct answer to the third question is - 2. Decrease.
The use of a renewable source of energy decrease the oil consumption because consumption of renewable source of energy can be used as an alternative to oil consumption.
The correct answer to question four is- 1. Bioremediation
Bioremediation is the process in which the pollution is cleaned by using live organisms. Bioremediation by microbes is used to remove oil spills in oceans.
The best method to reduce the threat of overfishing would be to2)Limit the harvest of particualr fish species. The risk of oil spills could be reduced by increasing the use of 2) Renewable energy sources, which should help 2) Decrease oil consumption. If an oil spill does occur, 1)Bioremediation could be used to help remove the oil so the ecosystem may more quickly recover.
African penguins, which inhabit the coasts of southern Africa, face significant threats from oil spills and overfishing. These issues endanger their food supply and survival.
The best method to reduce the threat of overfishing would be to:To further support the conservation efforts, BirdLife South Africa and CapeNature are introducing rehabilitated African penguins to new sites to establish colonies buffered from negative effects like climate change and fluctuating fish populations.
Why do we use the term climate change instead of global warming?
Answer:
Climate Change is more siencetific.
Explanation:
Both of the terms in question are used frequently in the scientific literature, because they refer to two different physical phenomena. As the name suggests, 'global warming' refers to the long-term trend of a rising average global temperature
Is the following sentence true or false? The cells that make up animal bodies are eukaryotic
Answer:
true
Explanation:
The answer to this questions is true.
This is a picture of a U-shaped ________ formed by a glacier through these mountains. A) canyon B) cavern C) plateau D) valley
D) valley (or morena)
Four different segments of a DNA molecule are represented below
the answer is false.
Calculate the concentration of sugar in g/L in a solution that contains 40 g of sugar in 100 mL of solution. (There are 1,000mL in 1 L...don't forget to convert your mL to L)
Answer:
The answer is 4 g /L.
Step by Step Explanation:
As the solution has 40 g of sugar and the volume is 100 ml.
to convert the units into liter we consider the equation,
C1 V1 = C2 V2 where,
C1 = initial concentration
V1= initial Volume
C2= required concentration
V2 = final volume
So if we put the values.
(40g) (100 ml) = C2 (1000 ml)
4000/1000 = C2
4 = C2
as 1000 ml = 1 L
so the concentration will be 4 g in 1 L
Final answer:
The concentration of sugar in the solution is 400 g/L, calculated by dividing 40 g of sugar by the volume of the solution in liters (0.1 L).
Explanation:
To calculate the concentration of sugar in grams per liter (g/L), you first need to convert the volume from milliliters (mL) to liters (L), keeping in mind that there are 1000 mL in 1 L.
We have 40 g of sugar in 100 mL of solution. To find the concentration in g/L, we use the following steps:
Convert the volume of the solution from mL to L: 100 mL × (1 L / 1000 mL) = 0.1 L.
Use the formula for concentration: Concentration (g/L) = amount of solute (g) / volume of solution (L).
Plug the values into the formula: 40 g / 0.1 L = 400 g/L.
Therefore, the concentration of sugar in the solution is 400 g/L.
Alien species often displace native species because alien species
I think it is because they are invasive species
Answer:
Alien species often displace native species because alien species _____.
Outcompete native species
Explanation:
Gradpoint
Which of these is a characteristic of sexual reproduction
Answer:
hello, are there any options?
Answer:
C: it results in offspring with genetic variation
Explanation: Because I got it right!
2. Which process or theory explains how life could have arisen from nonliving materials?
O A. Cambrian explosion
O B. Abiogenesis
O C. Differentiation
O D. Photosynthesis
Answer:
Explanation:
Biogenesis is the production of new living organisms or organelles. Conceptually, biogenesis is primarily attributed to Louis Pasteur and encompasses the belief that complex living things come only from other living things, by means of reproduction. That is, life does not spontaneously arise from non-living material, which was the position held by spontaneous generation.[1][2] This is summarized in the phrase Omne vivum ex vivo, Latin for "all life [is] from life." A related statement is Omnis cellula e cellula, "all cells [are] from cells;" this conclusion is one of the central statements of cell theory.
Answer: b) abiogenesis
Explanation: Abiogenesis is A theory that explains how living organisms might arise from non-living material
Select all the correct answers
The map shows the regions of the United States that suffered from drought in 2012. Which of the regions marked on the map are most in need of
dam construction, levee removal of water desalinization?
Answer: Option (1)
Explanation: In the given picture, we can mark the location or the area where a dam must be constructed.
At region 1, where there is extreme moisture and water content comparatively high, a dam should be constructed which will facilitate the water to flow from the dam to the drought affected areas such as region 2 and 3.
Water salinity can also be reduced and thus the place possibly won't face drought.
Thus the correct answer is option (1).
What holds one strand of DNA together?
Answer:
Nucleotides and bases.
Hope this helps!
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