Based on what you know about resistance to infection, why are some people resistant to HIV?
A) They have a strong immune system that clears the virus completely.
B) They have been immunized in an experimental program.
C) They can't be infected with HIV even when exposed.
D) They never engage in risky behavior and thus can't become infected.
C
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If she moves the repressor gene (lacI), along with its promoter, to a position at some several thousand base pairs away from its normal position, we would expect the _____
A) repressor will no longer be made B) repressor will no longer bind to the operator C) repressor will no longer bind to the inducer D) lac operon will be expressed continuously E) lac operon will function normally
“Smaller teeth and jaws, presence of a chin, thin
facial bones, and rounder, higher skull” would be a partial description of a. Australopithecus robustus. b. Australopithecus boisei. c. Homo habilis (early Homo). d. Homo erectus. e. Homo sapiens.
Although most biologists do not consider viruses to be alive, viruses do share some characteristics with living things. Which of the following is the requirement for life that viruses lack?
A) The ability to reproduce on their own B) The ability to move C) Having genetic material D) Having highly ordered structure
Osmoconformers would most likely be found in:
a. estuaries. b. coastal zones that receive freshwater. c. freshwater. d. terrestrial habitats. e. open ocean waters.