Answer:
a
Explanation:
A. Channel and carrier proteins move substances in a certain direction, regardless of their concentration gradients.
Channel and carrier proteins are both types of facilitated transport.
Facilitated diffusion is one of the ways of transporting molecules and is characterized by the use of proteins that are inserted in the plasma membrane, such as ion channels and carriers or permeases.
Ions, amino acids and monosaccharides, among many other molecules, cannot cross the plasma membrane, because they are polar or are very large in size.
So, for the cell to obtain or eliminate these substances, the presence of transporter proteins is necessary.
This diffusion is a type of passive transport, because it takes advantage of the concentration gradient of the molecules and does not waste energy.
Ion channels are integral tunnel-shaped proteins, selective for one, two, or three ions. When a channel opens, ions flow under two principles: the concentration gradient and the electrochemical gradient.Consequently, when an ion channel opens, the potential difference between the two compartments is altered.
Transmembrane proteins mediate the transport of molecules such as bicarbonate or large, polar, uncharged molecules such as glucose.The transport through these proteins occurs in favor of the concentration gradient, and by a reversible conformational change of the proteins that allows the translocation of the molecule to the other side of the membrane.
This type of transport is always without energy expenditure and in favor of the electrochemical gradient, it occurs in the following way:
Uniport, a single molecule translocates in only one direction.Simporte, two molecules that translocate in the same direction.Therefore, we can conclude that channel and carrier proteins are both types of facilitated transport.
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Which statement is true regarding the transmission of sex-linked traits in a population?
O Males cannot carry recessive alleles for sex-linked traits.
O Males cannot express dominant alleles on the X chromosome.
O Males cannot express recessive alleles on the X chromosome.
O Males cannot pass alleles for sex-linked traits to their daughters.
Answer: none of the statements are true
Explanation: Males can have a recessive copy of a X-linked gene, and can pass that on in the X containing gamete and so pass it on to daughters, but not to male offspring. Males will express whichever allele, dominant or recessive that they carry.
Explain why lamarckism is currently not a widely accepted theory
Answer:
Its not really taught in schools that much.
Explanation:
10. What is the difference between predation and parasitism? *
Answer:
Predation involves an indivudal creature hunting, killing, and then consuming an animal. An example of this would be a fox hunting a rabbit and then eating it. A parasite is something that can live on or inside another organism, feeding off of it without outright killing it (at least not right away). An example of a parastie would be a tapeworm.
Answer:
C) Predators typically kill their victim, while parasites mostly want to keep the victim alive for continued resources.
Explanation:
-3-
I need help it’s hard help please
Which of the following is false about DNA?
A. DNA is made up of units called nucleotides.
B. Any base can pair to any other base.
C. DNA contains the instructions to make proteins.
D. DNA is found in a cell's nucleus.
Answer:
b. any base pair can pair to any other base
Explanation:
Any base pair cannot pair with any other base, Adenine pairs with thymine and cytosine pairs with guanine.
• The hereditary material in humans and almost all of the living species is known as DNA or deoxyribonucleic acid.
• The majority of the DNA is present within the nucleus of the cell.
• DNA comprises the instructions to make proteins that helps to perform essential functions within the body of an organism.
• Within the DNA, information is stored in the form of a code formed of four chemical bases, that is, Adenine, guanine, cytosine, and thymine.
• The base pairs present within the DNA pairs up with each other, that is, adenine pairs with thymine only, and guanine pairs with cytosine, no other kind of pairing is found within the DNA. Each base of also attached with a molecule of phosphate and sugar.
• Together, a phosphate, base, and sugar are known as a nucleotide.
Thus, statement B is incorrect.
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What happens to the amount of energy as it moves up through an energy pyramid?
A. Some of the energy is lost.
B. Organisms double their energy as they move up the pyramid
C. Energy is transferred from the top to the bottom
D. The energy levels stay the same
Answer: some energy is lost from the pyramid, energy is transferred from bottom (producers) to top, but in decreasing amounts.
Explanation: total energy is conserved, but not necessarily within the energy pyramid, which is an open system where energy is lost from the pyramid, mainly as heat but also as sound.
Energy is transferred up the pyramid but the amount transferred at each stage is less because of losses outside the pyramid.
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Do you think humans go through a simple life cycle? Explain your reasoning.
Answer: no
Explanation: we complex
an egg cell in a gorilla contains 24 chromosomes. When the egg cell is fertilized, which of the following occurs?
A.
The 24 original chromosomes replicate, resulting in 48 chromosomes in the fertilized egg.
B.
The 24 original chromosomes split at the centromere, resulting in 48 chromosomes in the fertilized egg.
C.
The nucleus of a sperm cell fuses with the nucleus of the original egg cell, resulting in 48 chromosomes in the fertilized egg.
D.
The nucleus of another egg cell pairs with the nucleus of the original egg cell, resulting in 48 chromosomes in the fertilized egg.
Answer:
Its C
Explanation:
DNA from 2 parents, 24 from each parent is combined into one with 48 chromosomes. Hopefully, that makes sense and is correct.
what do Entropy mean
Answer:
lack of order or predictability; gradual decline into disorder.
Explanation:
Answer:
Entropy means the amount of energy in a system that is unable to work
(randomness)
The picture shows a model of a cell. What is the main function of the cell part labelled Y in the model
In other words, how are we speeding up the effects of the competitive exclusion principle and thereby altering the outcome of that ecosystem's natural succession
Answer: Overgrazing, overfishing, and forest fires
Explanation:
Competitive exclusion principle two species which have the same ecological niche cannot exists together as such species will be competing for the same resources. The species which is superior over the other will receive the resources and the other species having no competitive advantage will not survive in future.
According to the given situation, human being is the most superior species on earth and have competitive advantage of thinking ability and intelligence over other species. Succession are the changes that occur in the biotic community of an ecosystem with respect to time.
The human beings can speed up the effects of the competitive exclusion principle by various ways: Overgrazing, overfishing, and forest fires. The overgrazing of the cattle in the field can remove the vegetation cover of the region and the land will become barren so instead of progressive succession in terms of vegetation cover the succession will again re-initiate in terms of primary succession if environment supports.
Overfishing can cause the exclusion of some valuable species of fish and there will not be evolution of such species and will alter the outcome of natural succession.
Forest fires can affect both floral and faunal species some species may tolerate the fire and will survive and some precursors like roots of the plants can support new individual plants. This will again alter the outcome of natural progressive succession in an ecosystem.
Which of the following items may be on the laboratory bench to while doing la work?
Answer:
Disinfection needs to happen after any spill as well as after every work shift. The CDC recommends the use of a ten percent bleach solution as the standard for disinfection, but other products might be preferred for your lab.
Explanation:
Limestone form as ocean water evaporates and leaves calcium carbonate behind, which is the deposited in the seabed. What type of rock can be formed this way?
Answer:
Sedimentary rock.
Explanation:
Limestone form as ocean water evaporates and leaves calcium carbonate behind, which is then deposited in the seabed. Thus, the type of rock that can be formed this way is a sedimentary rock.
The texture of inorganic land-derived sedimentary rocks is fragmental or clastic. Sediments come from land to form inorganic sedimentary rocks.
Some examples of inorganic land-derived sedimentary rocks are conglomerate, brescia and sandstone.
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What do you think the term genetic variation means? How does genetic variation
help a species survive?
Answer:
Genetic variation means that a specific gene has various alleles. ... Genetic variation makes it possible for a species to exhibit various traits related to that specific gene. Having a variety of traits can help species adapt to different environmental conditions over time.
Explanation:
Genetic variation is the presence of differences in sequences of genes between individual organisms of a species.
It enables natural selection, one of the primary forces driving the evolution of life.What is genetic variation?Genetic variation is a term used to describe there variation in the DNA sequence in each of the genomes.Genetic variation is the result of the alleles of genes.Genetic variation is important in evolution.To know more about genetics here
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Among cattle, coat color is controlled by 2 codominant alleles, RR (producing a red coat) and WW (producing a white coat). The 2 alleles together, RW, produce a “roan” coat. The presence or absence of horns is controlled by the alleles H (hornless) and h (horned), with H completely dominant over h. show what the genotypes and phenotypes would be in both the F1 and F2 generations of a cross between RRHH x WWhh parents.
I will mark branliest to the first good answer
whick factor is a density dependent limting factors on poplation of a species
Answer:
I need to see an image of something to help u out
How do you think the systems on Earth work together to create what we see on Earth?
Answer:
Explanation:
Like this
Please help u have to do this today
Answer:
A
Explanation:
Both are igneous because lava/ magma form igneous rocks.
What type of duck only has 2 legs DONT LOOK IT UP
Answer:
dont all ducks have 2 legs?
the image of an object which is 10cm from a lens is formed on the same side as the object. If the image is 10cm behind the object, Find the focal length of the lens.
Answer:
Focal length is 6.67 cm.
Explanation:
Object distance, u, from the lens = 10 cm
Image distance, v, to the lens = 10 cm + 10 cm
= 20 cm
Apply the lens formula to determine the focal length, f, of the lens.
[tex]\frac{1}{f}[/tex] = [tex]\frac{1}{u}[/tex] + [tex]\frac{1}{v}[/tex]
= [tex]\frac{1}{10}[/tex] + [tex]\frac{1}{20}[/tex]
= [tex]\frac{2 + 1}{20}[/tex]
[tex]\frac{1}{f}[/tex] = [tex]\frac{3}{20}[/tex]
Find the inverse of both sides, so that;
f = [tex]\frac{20}{3}[/tex]
= 6.67
f = 6.67 cm
The focal length of the lens is 6.67 cm.
If anyone knows this please let me know and explain??
Answer:
I am pretty sure the answer is Melting
Explanation:
Summary
Food is chemical energy stored in organic molecules.
Food provides both the energy to do life's work and the carbon to build life's bodies.
• Autotrophs make their own carbohydrate foods, transforming sunlight in photosynthesis
or transferring chemical energy from inorganic molecules in chemosynthesis.
Heterotrophs consume organic molecules originally made by autotrophs.
All life depends absolutely upon autotrophs to make food molecules.
Questions:
Use the text above to answer the following questions.
1. Water and carbon dioxide mdlecules are reactants in the process of photosynthesis. Does
this mean they are "food" for plants, algae, and blue-green bacteria? Use the definition of "food
to answer this question.
2. Compare autotrophs to heterotrophs, and describe the relationship between these two grou
3. Name and describe two types of food making found among autotrophs, and give an example of each. which is quantitatively more important to life on earth (Which are there more of)
Order the following words from smallest to largest. Cell, atom, organ, tissue, electron element, molecule, organ system, organism, macromolecule.
Answer:
Electron, Atom, Element, Molecule, Macromolecule, Cell, Tissue, Organ, Organ Systems, Organism
Explanation:
Electron, atom, element, molecule, macromolecule, cell, organ, organ system, organism.
In the organization of life, it is usually arranged from the smallest to the most complex.
The electrons: This is the negative part of an atom that revolves round the nucleus of an atom.
The atom: This is the smallest unit of an element.
The element: This is a substance that is made up of atoms and cannot be further broken down.
The molecule: This is made up of elements that are usually held together by a chemical bond.
The macromolecule: This is a large molecule .which consists of smaller molecules combine together.
The cell: This is the structural and functional unit found in a living organism.
The organ: This is made up of a collection of tissues that carry out the same function.
The organ system: This is made up of different organs that work together to perform a similar function.
The organism: This can either be animal or plants that are capable of functioning independently.
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What are the signs and symptoms of sickle cell anemia?
symptoms
Explanation:
swelling
frequent infections
delayed growth or puberty
vision problems
sickle cells break apart easily and die leaving you with to few red blood cells
Please help me. <><><><><<>
Answer:
I would say D
Explanation:
A sample of a meteorite has a density of 23 g/ml. It takes up a volume of 147 ml.
What is the mass of this unknown sample?
Answer:
3,381 grams
Explanation:
The problem can be solved by using the formula for "Density." The formula for density is: Density (ρ) = [tex]\frac{mass}{Volume}[/tex]
Now that we know the formula, we can get the formula for the "mass."
mass = ρ x VolumeThe given density above is 23 g/mL while the given volume is 147 mL. We have the values of the density and volume, thus, it is easy to solve the problem.
Let's solve.
mass = 23 g/mL x 147 mLmass = 3,381 gramsThe mass of the meteorite is 3,381 grams.
gene expression is a regulated process due to the fact that-
Answer:
-almost all the cells of your body contain the exact same DNA.
Explanation:
Gene regulation is how a cell controls which genes, out of the many genes in its genome, are “turned on”.
Answer:
Genes are regulated to preserve energy and space.
Explanation:
The process of expressing genes is an energy-requiring process since it requires the breaking and synthesis of proteins. When genes are regulated energy is saved as only the gene required to perform a certain job is turned on and after the function is completed it is turned off. Therefore, continuous protein synthesis is not required to express the genes at all times.If the genes were not regulated i.e., turned off and turned on at required times then it would take a never-ending spree of gene expression which in turn would require a lot of time in transcription and translation.For more information:
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What are the energy producing organelles and under what conditions do they produce energy
Answer: mitochondria are the site of aerobic respiration, for which of course, they require oxygen.
Explanation: mitochondria are the site of aerobic respiration and energy production for which they require a supply of oxygen
The energy-producing organelle is the mitochondria, and the mitochondria make the energy in the aerobic cellular respiration where the cell uses oxygen and makes the energy that is the ATP.
What is the function of the mitochondria?The mitochondria are cellular organelles in which energy is produced, which happens when the cell gets enough oxygen and the glucose is broken down completely to form ATP. The ATP is formed due to the proper oxygenation of the glucose, and the proton gradient is formed. The proton gradient gives the energy to the cell for energy production, and the energy is used by the cell for the overall body metabolism and growth.
Hence, the energy-producing organelle is the mitochondria, and the mitochondria makes the energy in the aerobic cellular respiration where the cell uses oxygen and makes the energy that is the ATP.
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What portion of the DNA molecule is variable and serves as the “GENETIC CODE
what insects are missing from the tundra
Answer:
ant
Explanation: