I believe it would be the Hudson bay
can you add me as best answer? <span />
Answer:
<h2>A</h2>
Explanation:
Pepsinogen is an inactive enzyme which is activated into active digestive enzyme known as pepsin. It is a digestive enzyme which causes breakdown of proteins. Active pepsin causes cleavage of more pepsinogen molecule by a positive feedback loop and leads to increase in the concentration of active pepsin molecule.
Its concentration increases according the requirement in the body which is controlled by feedback system.
What are the answer choices?
What polar bears do to keep their temperature at a steady pace in cold temperatures is that they eat enough food to have a steady source and supply/constant amount of fat. Fat acts as an insulating agent and bears have plenty of it. This also explain why a lot of other animals who live in very cold climates have a lot of fat on their bodies.
Answer – D. Facilitated diffusion through protein channels
Glucose molecules are too big to pass through the plasma membrane by direct diffusion, so Glucose gains entrance into a cell by facilitated diffusion through protein channels in the plasma membrane. Since glucose moves with the concentration gradient, the built-in protein channels are only there to facilitate the movement of glucose into the cell and no energy is expended.
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