Which mutant gene is responsible for resistance to HIV in some humans?
A. CCR5
B. HIV-1 group O
C. HIV-group M
D. SIV
Ans: A. CCR5
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Archaea that have been cultured in the laboratory include ____
a. Crenarchaeota and Euryarchaeota b. Crenarchaeota and Korarchaeota c. Euryarchaeota and Korarchaeota d. Euryarchaeota and Nanorarchaeota e. Nanoarchaeota and Korarchaeota
There has been a lot of discussion about stem cell research in mainstream literature (i.e., newspapers and magazines). Stem c ells come from all of the following except:
a) umbilical cord b)embryos c) bone marrow d) Stem cells can come from all of these sources
You have isolated a bacterium that grows in a medium containing only inorganic nutrients. Ammonia is oxidized to a nitrate ion. This bacterium is
A) gram-negative. B) using anaerobic respiration. C) a chemoautotroph. D) a photoautotroph. E) a photoheterotroph.
The structure of ATP includes each of the following except:
A) the nitrogenous base adenine. B) phosphate groups. C) the nitrogenous base adenosine. D) the sugar ribose.