Which of the following statements about the strands of a newly replicated DNA molecule is correct?
A. Both strands are made up of newly
assembled nucleotides.
B. One strand is new and the other is from
the original molecule.
C. Both strands contain some nucleotides
from the original molecule.
D. The sugar-phosphate chains are
conserved and new bases are inserted
between them.
E. The base pairs are conserved and new
sugar-phosphate backbones are built up on
them.
B
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Which of the following has been associated with a form of liver cancer?
A. Human T-cell lymphotropic virus B. Hepatitis A virus C. Human papilloma virus D. Hepatitis B virus
When two organisms do not mate because they breed at different times of the year, they are exhibiting ____
reproductive isolation.
a. behavioral b. ecological c. gametic d. mechanical e. temporal
Cultivated wheat is descended from three distinct species, each with a diploid set of 14 chromosomes. Thus, it is
A) an allotriploid with 21 chromosomes. B) an allotriploid with 42 chromosomes. C) an allohexaploid with 84 chromosomes. D) an allohexaploid with 42 chromosomes. E) an autotetraploid with 28 chromosomes.
Impetigo can be caused by
A) Staphylococcus aureus. B) Staphylococcus epidermidis. C) Streptococcus pyogenes. D) both Staphylococcus aureus and Streptococcus pyogenes. E) both Staphylococcus epidermidis and Streptococcus pyogenes.