Before cell division of somatic cells, each chromosome must be replicated. After replication, the resulting two parts of each chromosome are held together by cohesin at the centromere. These two parts are referred to as
A. genes.
B. homologous chromosomes.
C. daughter chromosomes.
D. sister chromatids.
E. kinetochores.
Answer: D
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Which site on the ribosome is never occupied by a tRNA linked to a nascent polypeptide chain?
A. the A site B. the P site C. the E site
Four of the five choices listed below are derived
from the same germ layer. Select the exception. a. lining of intestinal tract b. circulatory system c. liver d. pancreas e. stomach
A large region of the F plasmid (~33 kb) is called the transfer region (tra) and contains about 40 genes necessary for conjugation. The gene traA codes for the protein pilin that is polymerized to form a pilus, using a number of other tra genes
The pilus is a hollow cylinder whose units disassemble once contact is made in order to "reel in" the recipient cell. What other functions of the tra genes are required for transfer? A) DNA unwinding, and prevention of contact with F+ cells B) enzymatic DNA replication C) resistance to phage infection D) integration of F genes into the recipient's chromosome E) integration of F genes into the recipient's plasmid
What ecosystem has the highest rate of primary productivity?
a. savanna b. agricultural land c. algal beds and reefs d. boreal forest e. tropical rain forest