I would say the answer is C
Galaxy
- It is a collection of billions of stars.
- Resembling human beings or animals.
- There are billions of galaxies in the Universe.
- There are not many galaxies, which are visible to the naked eyes.
Constellation
- It is a collection of only a few stars.
- Stars in the constellation are arranged in patterns resembling human beings or some animals.
- There are only about 88 constellations.
- There are many constellations, which can be observed with the help of naked eyes.
when a prokaryote reproduces, it will duplicate its self and make another one just like it. like a carbon copy. they dont get to be diverse because they dont reproduce sexually, which would mix up genes making it more diverse.
I think it’s C) Group of organisms in a particular place
Answer:
Low phenylalanine concentration:
- If the enzyme is inactive, PAH will look like its inactive form, with phenylalanine located in the allosteric site / inactive site so that PAH is a different shape. This will not allow as much phenylalanine to be converted into tyrosine, as we wait for Phe levels to increase.
High phenylalanine concentration:
- If the enzyme is active, PAH will look like its regular form, with an open active site that's the size of phenylalanine so that reactions can occur. (Like a hand fitting into a glove, or a lock into a key.) Phenylalanine will be the substrate, the thing acted upon by the enzyme. This will eventually raise the amount of tyrosine that's created and lower the concentration of phenylalanine.
Think about it like this. Ever heard of homeostasis? That's how the body likes to be the same, keep everything regulated, all the time. So if there are high levels of something, the body is going to try to keep that something down, and if there are low levels, it's going to try to increase the concentration of that thing.