When is the length of day always the greatest?
A) during the September equinox
B) during the March equinox
C) during the winter solstice
D) during the summer solstice
D
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Point mutations in the hemagglutination (HA) or neuraminidase (NA) genes during viral ribonucleoprotein (RNP) replication give rise to new strains. This mechanism is known as the antigenic:
a. drift. b. shift. c. re-assortment. d. modification.
Movement of a molecule against a concentration gradient occurs in:
a. simple diffusion b. facilitated diffusion c. osmosis d. active transport e. passive transport
X chromosome inactivation in humans occurs ____
a. after fertilization but before cell division begins b. just after cleavage begins c. at implantation d. gestational week 1 e. just after birth
Which process does not return carbon to the atmosphere?
a. animal respiration b. photosynthesis c. combustion
d. plant respiration e. decomposition