When homologous replicated chromosomes pair up during meiosis, they form a
A. sister chromatid.
B. centromere.
C. single-stranded chromosome.
D. tetrad.
Answer: D
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The glial cell that defends the body against pathogens is the
A. astrocyte. B. ependymal cell. C. neurolemmocyte. D. microglial cell. E. oligodendrocyte.
The necks of giraffes are the closest extant equivalent to the necks of sauropod dinosaurs
Two hypotheses have been proposed to explain the functional significance of the necks of giraffes, and those hypotheses can be applied to the necks of sauropods: • Competing browsers hypothesis-The long neck makes more food resources available to a giraffe or sauropod by allowing it to reach upward to browse on vegetation that is not available to short-necked browsers. • Necks-for-sex hypothesis-Males giraffes and sauropods use their necks and heads to batter opposing males during intraspecific combat. Thus, long necks increase the fitness of males by increasing their opportunities to mate. What predictions can you make about the relative lengths of the necks of male and female sauropods to test these hypotheses?
Check all of the major hypotheses of aging.
A. Damage to mitochondria B. Presence of a "cell death clock" C. Damage to lysosomes D. Damage to the DNA from free radicals E. Presence of "death genes"
Regardless of the internal diameter, all ET tubes have:
A) a 15/22-mm proximal adaptor. B) an inflatable cuff at the distal tip. C) a pilot balloon on the proximal end. D) black millimeter markings on the side.