Why are most of the trees in temperate rain forests evergreens?
What will be an ideal response?
There is abundant precipitation in winter months and the ground seldom freezes, so there is little need for the trees to lose their leaves.
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How many vacancies does carbon have?
a. two b. three c. four d. five e. six
Which is a characteristic of a plasmid used as a cloning vector? (Select all that apply.)
A) contains a selectable marker B) contains an origin of replication C) has several unique recognition sites for restriction enzymes D) integrates into the host chromosome E) can hold an insert of up to 300 kb
The BRCA2 protein functions in double-strand break repair. If a woman is heterozygous for a loss-of-function allele of BRCA2, she
A) will develop cancer because two functional copies of BRCA2 are needed in every cell. B) will not get cancer because BRCA1 can compensate for the loss of BRCA2. C) will develop cancer after several mutations occur, even if the mutations occur in different clonal populations of cells. D) may develop cancer because mutation of the wild-type BRCA2 allele could destroy an important DNA repair mechanism.
During which stage of the cell cycle does the M checkpoint occur?
A. telophase B. metaphase C. S phase D. G1 E. prophase