In lactation, milk production is stimulated by _______, while milk release is stimulated by ___________.
A. oxytocin, prolactin
B. progesterone, oxytocin
C. prolactin, oxytocin
D. prostaglandin, oxytocin
E. progesterone, prolactin
C. prolactin, oxytocin
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Which one of the following is a signal that induces multicellularity of choanoflagellates?
A. the presence of predators in the environment B. the presence of the preferred prey/food source in the environment C. the developmental signal molecules that induce differentiation D. the cell migrations that take place in the developmental phases of growth
Which of the following statements is false?
A. Peptide hormones act on time scales of days to months. B. Amine hormones are more abundant than steroid hormones. C. Peptide hormones can evolve through changes in their amino acid sequence. D. Peptide hormones and amine hormones are both derived from amino acids. E. Steroid hormones are hydrophobic, whereas amine hormones are hydrophilic.
HIV infection and the subsequent destruction of which cell type is most devastating to overall immune system function?
A. cytotoxic T cells B. memory B cells C. helper T cells D. monocytes E. natural killer cells
Genomics studies have shown that humans and rice share about ____ percent of their genomes.
A. 1 B. 4 C. 8 D. 15 E. 25