Which of the following steps is the third step of the mating-type switch mechanism?
A. A 3' single-stranded overhang is created.
B. The MAT locus is cleaved by a specific nuclease to create a double-stranded break.
C. Strand invasion of HMLa or HML? is mediated by Rad51.
D. As the 3' invading end is extended by DNA polymerase, the HML locus information is copied, whereas the MAT gene information is degraded.
E. When the extension has proceeded far enough, it dissociates and reanneals to its original strand.
C
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A turgid plant cell is one that:
A. lacks a cell wall B. has an extra cell wall layer C. lacks a cytosol D. has excess water in its cytosol E. may be described as flaccid
Which of the following is not true of vectors?
A. They contain a gene for drug resistance. B. An origin of replication (ORI) is present. C. They are easy to manipulate. D. They can detect RNA in cells. E. They must accept DNA of desired size.
The Shine—Dalgarno sequence is a purine-rich region just upstream of a start codon and is necessary for the initiation of protein synthesis in prokaryotes
Indicate whether the statement is true or false
The structure labeled 3 in Figure 51-2 is the:
a. archenteron.
b. endoderm.
c. mesoderm.
d. blastocoel.
e. ectoderm..