Answer:
Chordate
Explanation:
Chordate are animals of the phylum Chordata. They contain a notochord and a dorsal nerve chord. There are many creatures in this phylum including the tiger, shark, and more.
Answer:
<em><u>Concentration gradients:</u></em>
- Passive transport: In favor ----> Simple Diffusion and facilitated diffusion
- Active transport: Against
<u><em>Phospholipid bilayer</em></u>
- Passive transport: Small particles or molecules can pass through the membrane----> Simple diffusion
- Active transport: Big particles or molecules need proteins to pass from one side to the other of the membrane
<u><em>Membrane proteins</em></u>
- Passive transport: Channel proteins in favor of electrochemical gradient---> Facilitated diffusion
- Active transport: Transporters or carrier proteins help molecules to pass to the other side of the membrane the electrochemical gradient.
Explanation:
<u>Diffusion:</u> Refers to the pass of some small polar hydrophilic molecules through the lipidic bilayer. There are momentary membrane openings that allow small molecules to freely move from one side to the other in favor of the electrochemical gradient. These openings are the result of the lipids movements. The membrane permeability depends on the size of the molecule. The bigger the molecule is, the less capacity to cross the membrane it has. Diffusion is a very slow process, and to be efficient requires short distances and pronounced concentration gradients.
<u>Facilitated diffusion:</u> Occurs when big hydrophilic molecules cannot move freely across the membrane. In these situations, channel proteins are in charge of passive transport. Facilitated diffusion also occurs in favor of electrochemical gradients, meaning that molecules move from the more concentrated side to the less concentrated side.
<em>Simple diffusion and facilitated diffusion are passive transport processes because the cell does not need any energy to make it happen. </em>
<u>Active transport </u>is against the electrochemical gradient, so it does need energy to happen. Molecules move from a lower concentration side to a higher concentration side. This process is always in charge of carrier proteins. In primary active transport, the energy needed comes from the ATP molecule. In secondary active transport, the energy comes from the membrane electric potential.
<u>Transmembrane proteins</u> act in active and passive transport, connecting cells, and participating in signal transduction.
Channel proteins act by passive transport (these proteins do not need energy to carry in or out substances. They do it according to an electrochemical gradient) and carrier proteins act during active transport (these proteins do need the energy to transport substances because they do it against an electrochemical gradient). These transmembrane proteins carry in those substances needed by the cells to properly perform their activities, and they can also carry out waste substances.
Answer: probability that both twins are affected is 0.0625 while the probability that both twins are unaffected is 0.5625
Explanation:
If both parents are heterozygous for albinism, it means they both have one recessive allele (Aa) each.
The possible genotype outcome of one child will be
AA Aa Aa aa
Therefore the possiblility one child will inherit both recessive allele (aa) is 1/4 and the probability that one child is unaffected is 3/4
If the had a dizygoyic twins this means the two children have different DNA.
So also the possibility of the second child to inherit both recessive allele (aa) is 1/4
The probability that both the twins are affected is
1/4 * 1/4 =1/16 = 0.0625
The probability that both are unaffected is
3/4 * 3/4 = 9/16 = 0.5625
Answer:
B
Explanation:
Bulk flow is an energy-requiring mechanisms, whereby water and solutes move through the cell due to its pressure gradient. This process is much faster when compared to osmosis and diffusion.
The answer is B An observation about the number or amount of something