Refer to Figure 44-2. Which cell type is the source of antibodies?
a. A only
b. B only
c. C only
d. D only
e. both A and B
D
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________ activate repressor proteins, thereby decreasing the synthesis of certain enzymes.
A. Modulators B. Corepressors C. Effectors D. Inducers
Which of the following statements regarding waterborne pathogens is incorrect?
A. Microbes can enter surface water through ordinary exposure to air and soil. B. Waterborne pathogens are primarily Campylobacter, Salmonella, Shigella, Vibrio, and Mycobacterium. C. Waterborne pathogens include bacteria, viruses, and protozoans. D. Encysted protozoans can survive in water for long periods without a human host.
In the Southern Hemisphere, gyres rotate in the ________ direction
Fill in the blank(s) with correct word
Which of the following is NOT characteristic of a fern?
a) Fern sporophyte is the dominant generation in the fern life cycle. b) Eggs are produced in antheridia. c) Fern gametophyte is nonvascular. d) Fern sporophyte leaves first appear in a curled-up form termed a fiddlehead. e) Fern sporophyte is vascular.