The rise and fall of hormone levels in the body is an example of:

• A. genetic mutation
• B. negative feedback regulation
• C. passive transport
• D. enzyme inhibition

Answer: (B)

Verified step by step guidance

1. Step 1: Begin by understanding the concept of negative feedback regulation. Negative feedback is a biological mechanism where the output of a system inhibits or reduces the activity of the system to maintain homeostasis. For example, hormone levels are regulated to prevent excessive or insufficient production.
2. Step 2: Compare negative feedback regulation with the other options provided. Genetic mutation refers to changes in the DNA sequence, which is unrelated to the regulation of hormone levels. Passive transport involves the movement of molecules across a membrane without energy input, which is also unrelated to hormone regulation.
3. Step 3: Examine enzyme inhibition. Enzyme inhibition refers to the process where a molecule binds to an enzyme and decreases its activity. While enzymes can play a role in hormone production, this is not the primary mechanism for regulating hormone levels in the body.
4. Step 4: Relate the concept of negative feedback regulation to hormone levels. Hormones like insulin and glucagon are regulated through negative feedback loops to maintain stable blood sugar levels. When blood sugar rises, insulin is released to lower it, and when blood sugar falls, glucagon is released to raise it.
5. Step 5: Conclude that the rise and fall of hormone levels in the body is an example of negative feedback regulation, as this mechanism ensures balance and stability in physiological processes.