The most economically useful unicellular fungi are
A. basidiomycetes.
B. mushrooms.
C. actinomycetes.
D. yeasts.
Answer: D
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The cells active in both innate and adaptive immunity develop from common pluripotent precursors in the bone marrow called
A) B cells. B) killer cells. C) stem cells. D) leukocytes.
Which statement about diversity in eye development is not correct?
A. Planaria have the simplest eyes, which are basically pit-shaped cells containing photoreceptors. B. Evolution of the spherical lens improved images as animals evolved. C. Both squids and vertebrates have singlelens eyes, but they are very different in their development, anatomy, and physiology. D. The percentage of living animals possessing true eyes that can produce an image is small. E. Compound eyes consist of hundreds of small lenses arranged on a convex surface.
Restriction enzymes typically recognize
A) sequences in threefold symmetry. B) single-stranded DNA only. C) specific palindromic sequences. D) several nucleotide sequences simultaneously. E) all of the above
AZT and Valaciclovir are antiviral nucleoside analogs that interfere with
A) protein synthesis. B) cell wall synthesis. C) cell membrane component synthesis. D) nucleic acid synthesis. E) viral attachment.