Insulin is a peptide hormone that controls the level of glucose in the blood. It is released from the pancreas as soon as you eat, even before blood glucose levels rise. This is an example of:
A. conditioning.
B. positive feedback.
C. negative feedback.
D. feed-forward regulation.
Answer: D
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About how many bases of DNA wrap around a histone complex?
A. <50 B. 150 C. 200 D. >1,000
The process used to control the level of water and ions in body fluids is termed
A. thermoregulation. B. mechanoregulation. C. chemoregulation. D. hemoregulation. E. osmoregulation.
The gross reproductive rate is
A) the total number of offspring born to a population. B) the total number of offspring born to a population each year. C) the average number of female offspring born in a year. D) the average number of female offspring born to her over her lifetime.
Hemoglobin, the protein responsible for binding and transporting oxygen, forms a tetramer. What is the protein composition of the most common form of hemoglobin, hemoglobin A (HbA)?
A) ?1?1 B) ?1?2 C) ?2?1 D) ?2?2 E) ?2?S