Ionizing radiation alters DNA by
A) deleting bases.
B) removing nitrogen from the bases.
C) breaking the sugar-phosphate backbone.
D) reversing replication forks.
C) breaking the sugar-phosphate backbone.
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A patient presents with bleeding gums, loss of teeth, and slow wound healing. The doctor diagnoses the patient as having a deficiency in vitamin ___ and suggests that he increase the amount of ___ in his diet
A. C; fruit B. C; eggs C. D; dairy products D. E; fruit E. E; vegetables
Plasmodium falciparum is a protistan parasite, borne by mosquitoes, that constitutes a serious health problem for humans. The disease it causes is:
A. diabetes B. malaria C. yellow fever D. dengue fever E. Lyme disease
Bioluminescence is:
A. the production and emission of light by organisms B. the capture of moonlight for nocturnal photosynthesis C. the absorption of light by pigments for transfer to chlorophyll a D. the ability to detect and move away from sources of light E. the ability to detect and move toward sources of light
The active site of an enzyme ____
a. is where the coenzyme is located b. is a specific bulge or protuberance on an enzyme c. is a groove or crevice in the structure of the enzyme complementary to the substrate d. will react with only one substrate no matter how many molecules may resemble the shape of the substrate e. rigidly resists any alteration of its shape