Perforin is produced by
A. B cells.
B. macrophages.
C. NK cells.
D. T helper cells.
E. macrophages AND NK cells.
C
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Which one of the following statements about Chlamydia and Chlamydophila spp. is false?
A) They are obligate intracellular pathogens. B) They are considered to be “energy parasites.” C) The diseases they cause are all arthropodborne. D) They are considered to be Gram-negative bacteria.
In prokaryotes, most of the control of gene expression is at the ____ level
a. transcriptional b. transcript processing c. transport d. translational e. post-translational
Molluscs that live in a tusk-like shell that is open at both ends belong to the class:
a. Polyplacophora. b. Scaphopoda. c. Cephalopoda. d. Gastropoda. e. Bivalvia.
Lost traps to collect shellfish have a large impact on
a. marine mammals. b. marine birds. c. marine turtles. d. lobster and crabs. e. plankton.