The calculation for determining sex ratio is
A) averaging the percentage of students who are female in many large school populations.
B) the number of males divided by the number of females multiplied by 1,000 for people of a particular age.
C) 1,000 minus the number of whichever sex is in excess.
D) the number of Y chromosomes in a population divided by one-third the number of X chromosomes.
B) the number of males divided by the number of females multiplied by 1,000 for people of a particular age.
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All of the following hormones are lipids derived from cholesterol EXCEPT
A. melatonin. B. estradiol. C. cortisol. D. aldosterone. E. testosterone.
In the cyclic pathway, electrons ejected from photosystem I return to:
a. photosystem II b. photosystem I c. the stroma d. the outer chloroplast membranes e. ATP synthase
In a hypotonic environment, a plant cell will do which of the following?
a. swell b. stay the same size c. shrink d. cannot be determined
All the following are true of B vitamins EXCEPT
a. they are water soluble. b. they serve as coenzymes. c. they can be lost during food processing and preparation. d. they are stored in adipose tissue.