The most ancient paths of information flow are
a. located in the midbrain.
b. reflex arcs.
c. found in the lower part of the brain.
d. found in the autonomic nervous system.
e. the circuits from sense receptors to the brain.
Answer: b
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What is the pollen to ovule ratio for species B?
a. 100 b. 10,000 c. 100,000 d. 100,000,000
Suppose the experiment of Meselson and Stahl was performed on a sample of 8 cells, each containing one copy of its circular double-stranded DNA genome, and that had been growing on normal 14N medium. You then grew the cells for 3 generations in medium containing 15N. The outcome would be
A) 8 cells with single-stranded DNA molecules with 14N, and 24 cells with single-stranded DNA molecules with 15N. B) 16 cells with double-stranded DNA molecules with equal amounts of 14N and 15N, and 48 cells with double-stranded DNA molecules with 15N. C) 8 cells with double-stranded DNA molecules with equal amounts of 14N and 15N, and 24 cells with double-stranded DNA molecules with 15N. D) 8 cells with double-stranded DNA molecules with equal amounts of 14N and 15N, and 32 cells with double-stranded DNA molecules with 15N. E) 65 cells with single-stranded DNA molecules with 15N.
After responding to complement, the main function of dendritic cells is to present antigen to which cells in an adaptive immune response?
A. Mast cells B. Basophil C. B cells D. NK cells E. T cells
What is the difference between whole-chromosome aberrations and point mutations?
A) Point mutations affect a single base pair in the genome; aberrations affect a large section. B) Aberrations are not permanent changes in the DNA; point mutations are permanent. C) Point mutations are not permanent changes in the DNA; aberrations are permanent. D) Point mutations are the loss of parts of chromosomes; aberrations are the loss of whole chromosomes.