It is difficult to make a vaccine against HIV because
a. the virus mutates rapidly.
b. it is too expensive.
c. it is a retrovirus.
d. not enough is known about it.
e. it contains reverse transcriptase.
A
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Based on the characteristics of crenarchaeote archaeons and euryarchaeote archaeons, these organisms likely evolved in oxygen-poor habitats
A. true B. false
Which of these affects allele frequencies the least?
A) Natural selection B) Mutation C) Migration D) Genetic drift
Excretion refers to the
A) Extrusion of sweat from the skin B) removal of metabolic waste from the body C) Elimination of bacteria from the body D) Discharge of feces from the body
In every DNA molecule:
A) the number of adenine molecules is the same. B) the total number of nitrogen-containing bases is the same. C) the sugar is deoxyribose. D) the order of nitrogen-containing bases is the same. E) a single sugar-phosphate backbone is present.