Succession in “old fields” is often reconstructed using ______
a. field experiments
b. laboratory experiments
c. historical records
d. evolutionary records
e. fossil records
C
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High concentrations of nucleic acids in the diet may lead to high levels of uric acid in the blood
Indicate whether this statement is TRUE or FALSE.
If a restriction endonuclease cuts a circular DNA three times, how many fragments should there be after the DNA is
subjected to electrophoresis through an agarose gel?
a. 1 b. 2 c. 3 d. 4 e. 5
A receptor on the cell surface usually has several domains. The function of the external domain is:
a. transmitting the signal to the inside of the cell. b. holding the receptor within the membrane. c. attaching the receptor to the DNA. d. functioning as an enzyme. e. binding the signaling molecule.
During bacterial conjugation, little circular chromosomes of DNA called plasmids are transferred from one bacterial cell to another. Why does this mechanism not fit the common definition of sexual reproduction?
a. No new offspring is produced. b. No new allelic combinations are formed. c. The cell receiving the plasmid does not contain genetic material from both parents. d. The plasmid can recombine with the recipient cell's chromosome.