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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology