The ____ is/are a plant’s main line of defense against viral infection

a. immune cells
b. viral toxins within the central vacuole
c. membrane proteins that latch onto virus particles
d. thick cell wall that prevents viral entry
e. nuclear membrane that is impermeable to viruses


ANSWER: d

Biology & Microbiology

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Several butterfly species that are edible to birds have very similar color patterns to the generally inedible monarch butterfly. This is best described as an example of what?

A. Müllerian mimicry B. Batesian mimicry C. crypsis D. intimidation E. aposematic coloration

Biology & Microbiology

Estuaries in which river flow is strong and prevents the flow of seawater upstream are called:

a. fjords. b. salt-wedge estuaries. c. well-mixed estuaries. d. tectonic estuaries. e. drowned river valleys.

Biology & Microbiology

Enzyme activity may be affected by

a. temperature. b. the presence of chemicals that fit into allosteric sites. c. feedback inhibition. d. metabolic conditions in the cell. e. all of these.

Biology & Microbiology

Figure 2-2 represents:


a. elemental helium.
b. molecular hydrogen.
c. molecular helium.
d. a water molecule.
e. molecular oxygen.

Biology & Microbiology