Hensen's node is located:a
in the walls of the archenteron.
b. at the end of the primitive streak.
c. on the outer side of the chorion.
d. inside a blastomere.
e. inside the neural groov
B
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The ability of cells to control their level of gene expression is called
A. gene transformation. B. gene regulation. C. gene splicing. D. gene addition. E. gene correction.
An example of antibody-mediated immunity is:
a. phagocytosis. b. macrophage release. c. T-cell activation. d. B-cell activation.
In __________, one of the sperm cells in the pollen
tube fertilizes the egg, forming a zygote; the other fuses with the endosperm mother cell and gives rise to __________. Fill in the blank(s) with the appropriate word(s).
Which of the following is MOST likely to be vaccinated against Bacillus anthracis?
a. cattle b. farm dog c. livestock worker d. wool sorter