The damage caused by parasites may be due to
A. competition for nutrients.
B. the physical blocking of organs.
C. the direct digestion of host tissue.
D. the host's immune response.
E. All of the choices are correct.
E
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In eukaryotes that lack mitochondria, what structures take over their function to generate ATP?
A. There are no eukaryotes that lack mitochondria. B. There are no structures that generate ATP in eukaryotes that lack mitochondria. C. hydrogenosomes D. chloroplasts E. None of these answer options is correct.
Bacteriophages and animal viruses
A. both may enter a host cell by endocytosis. B. both may enter a host cell by fusion. C. both involve entry of the entire nucleocapsid. D. differ because bacteriophages leave the capsid outside the cell, while animal virus entry involves the entry of the whole nucleocapsid.
A spider's chelicerae _____
a. detect light c. produce silk b. inject venom d. eliminate excess water
Repressors
a. bind to operators. b. lie between operators. c. lie between promoters. d. lie downstream from operators. e. are part of an operon.