C. He compared two groups of finches to illustrate natural selection
(although it was actually 4 groups of finches from 4 different islands)
The lock-and-key mechanism was first proposed by Emil Fischer which described as the enzymatic reactions whereby an enzyme with a single substrate binds temporarily to form a substrate complex. Just like a lock and key the enzyme as the lock and the substrate as the key is said to fit together
Answer:
C. A phosphate group from ATP is added to a transport protein, changing its shape and facilitating transport.
Explanation:
ATP hydrolysis drives the active transport of substances through membrane proteins. During the process, the released phosphate group from ATP is added to the nucleotide-binding site present on the membrane protein to trigger a conformational change in it.
For example, the binding of a phosphate group from ATP to the nucleotide-binding site of NA-K+ ATPase brings about a conformational change in the protein. The phosphorylates pump has more affinity for K+ and lower affinity for Na+. It facilitates the release of bound Na+ from one side of the membrane to another.
