A multicellular organism that has a mouth and lives in an animal host is a(n)
a. Alga.
b. Bacterium.
c. Fungus.
d. Helminth.
e. Virus.
Ans: d. Helminth.
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Which compounds serve as major sources of energy for ruminant animals?
A) acetic acid and glucose B) acetic, butyric, and propionic acids C) dimethylsulfoniopropionate, gluconate, and protocatechuate D) glucose and sucrose
A researcher discovers a new antibody. Upon evaluating its sequence, she determines that the antibody is not the result of genomic rearrangement alone. What other processes could have produced this specific antibody? Select all correct choices
A. germ cell hypomutation B. N-nucleotide addition C. alternative mRNA splicing D. somatic hypermutation
In order to be active, a Cdc-cyclin needs to be
A) singly phosphorylated. B) acetylated. C) doubly phosphorylated. D) doubly methylated. E) cleaved by proteases.
The lungs are protected from microorganisms by
A. lysozyme in mucus. B. phagocytic action of alveolar macrophages. C. the ciliated epithelial cells. D. All of the choices are correct.