The HPA axis is a stress response that consists of three steps: (i) secretion of (A)____ from the hypothalamus, (ii) secretion of (B)_____ from the pituitary, and (iii) secretion of (C)_____from the adrenal cortex.
a. (A) ACTH (B) CRH (C) cortisol
b. (A) cortisol (B) CRH (C) ACTH
c. (A) CRH (B) ACTH, (C) cortisol
d. (A) cortisol (B) ACTH (C) CRH
e. (A) ACTH (B) cortisol (C) CRH
Answer: c. (A) CRH (B) ACTH, (C) cortisol
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A. an endotoxin. B. modified mucus. C. flagella. D. an exotoxin.
As a child grows, the lungs increase in size as well. Hypothesize what the pressure of the gases within the lungs would be if the lung volume of an individual goes from 3000ml to 4000ml.
A. gas pressure would decrease B. gas pressure would increase C. gas pressure would be unchanged
Which one of the following factors would not influence the productivity of an ocean community?
A. Fertilizer runoff B. The season of the year C. The presence of nitrogen-fixing cyanobacteria D. Levels of autotrophs E. The amount of rainfall
The octameric histone core is composed of four different histone proteins, assembled in a stepwise manner. Once the core octamer has been formed, DNA wraps around it to form a nucleosome core particle
Which of the following histone proteins does not form part of the octameric core? (a) H4 (b) H2A (c) H3 (d) H1