Major gene reshuffling takes place during
a. prophase I.
b. metaphase I.
c. anaphase I.
d. metaphase II.
e. anaphase II.
A
You might also like to view...
Collagens are associated with which of the following types of cellular junctions?
A) gap junctions B) tight junctions C) plasmodesmata D) adhesive junctions E) none of the above
When enzyme action stops due to a buildup of end product that acts as a regulatory molecule, this control is called ________.
A. enzyme repression B. enzyme induction C. noncompetitive inhibition D. competitive inhibition
Interspecific hybrids differ from intraspecific hybrids in that
A. interspecific hybrids are common and intraspecific hybrids are rare. B. interspecific hybrids are fertile and intraspecific hybrids are not. C. interspecific hybrids can introduce new genetic material to a population and intraspecific hybrids cannot. D. None of the choices is correct.
The repair of mismatched base pairs or damaged nucleotides in a DNA strand requires a multistep process. Which choice below describes the known sequence of events in this process?
(a) DNA damage is recognized, the newly synthesized strand is identified by an existing nick in the backbone, a segment of the new strand is removed by repair proteins, the gap is filled by DNA polymerase, and the strand is sealed by DNA ligase. (b) DNA repair polymerase simultaneously removes bases ahead of it and polymerizes the correct sequence behind it as it moves along the template. DNA ligase seals the nicks in the repaired strand. (c) DNA damage is recognized, the newly synthesized strand is identified by an existing nick in the backbone, a segment of the new strand is removed by an exonuclease, and the gap is repaired by DNA ligase. (d) A nick in the DNA is recognized, DNA repair proteins switch out the wrong base and insert the correct base, and DNA ligase seals the nick.