Which of the following is NOT a function of the human gut microbiome?
A) production of essential amino acids and vitamins
B) production of volatile fatty acids from polysaccharides
C) iron and trace metal absorption
D) maturation of the gastrointestinal tract
Answer: C
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Humans have 22 pairs of autosomes plus one sex chromosome pair. How many autosomes are present in a normal human primary spermatocyte?
A) 22 B) 23 C) 44 D) 45 E) 46
Nonsteroid hormones differ from steroid hormones in that they
A) cause a change to occur in the target cell. B) bind to an intracellular receptor. C) are water insoluble. D) cannot be stored. E) bind to a receptor on the outer surface of the cell membrane.
Which of the following ions is most likely to passively cross the plasma membrane of a resting neuron?
A. Na+ B. Cl- C. Mg2+ D. Ca2+ E. K+
Figure 12.7
The accompanying illustration shows one possible outcome of the random alignment of homologous chromosomes at metaphase I. How many OTHER possible arrangements exist?
A. None B. One C. Two D. Seven E. Eight