The floating assemblage of microbes, plants, and animals that drifts on or near the surface of large bodies of water is the _______ community.
a) Abyssal
b) Benthic
c) Littoral
d) Plankton
Ans: d) Plankton
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A motor unit is a ____
a. single muscle fiber activated individually b. complete set of muscle fibers in a single muscle c. single sarcomere d. sequence of muscle fibers activated in order e. group of muscle fibers activated as a block
A frameshift mutation results in
a. a normal protein due to the redundancy of the genetic code. b. errors in DNA replication c. errors in DNA splicing d. a change in all mRNA codons downstream from the mutation e. a change in the third position of one codon
A chylomicron is a:
a. hormone. b. digestive enzyme. c. protein-covered fat droplet. d. component of bile. e. component of fiber.
Class I MHC genes code for
A. all HLA antigens. B. markers that display unique characteristics of self. C. receptors located primarily on macrophages and B cells. D. certain secreted complement components. E. All of these choices are correct.