All of the red squirrels living on a college campus would be a(n)
A) genus.
B) family.
C) population.
D) ecosystem.
E) community.
C
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Based on the fossil record, which of the following structures likely evolved first as plants made the transition to land?
A. leaves B. branches C. roots D. flowers
Which factor is NOT characteristic of a city primarily plagued by industrial smog?
a. high concentration of sulfur oxides b. fossil fuels used for manufacturing c. cold, wet winters d. high concentration of nitrogen oxides e. large factories of heavy industry
Identify the correct sequence of events that occur during the reproduction of HIV.
A. virus attaches to a host cell - the virus enters the cell - viral DNA is incorporated into the host DNA - reverse transcriptase occurs - viral / host DNA is turned into a viral mRNA code - the viral RNA forms into a mature virus - mature viruses leave the host cell B. virus attaches to a host cell - the virus enters the cell - viral DNA is incorporated into the host DNA - reverse transcriptase occurs - the viral RNA forms into a mature virus - viral / host DNA is turned into a viral mRNA code - mature viruses leave the host cell C. virus attaches to a host cell - the virus enters the cell - reverse transcriptase occurs - viral DNA is incorporated into the host DNA - viral / host DNA is turned into a viral mRNA code - the viral RNA forms into a mature virus - mature viruses leave the host cell D. virus attaches to a host cell - the virus enters the cell - viral / host DNA is turned into a viral mRNA code - viral DNA is incorporated into the host DNA - reverse transcriptase occurs - the viral RNA forms into a mature virus - mature viruses leave the host cell
What determines the primary structure of a DNA molecule?
a. the sugar-phosphate backbone b. complementary base pairing and the formation of hairpins c. the sequence of deoxyribonucleotides d. the sequence of ribonucleotides