Which of the following is directly involved in removing Spo11 that is covalently bound to the 5'-ending strand during meiosis?

A. RPA
B. ExoI
C. Rad50
D. Sgs1
E. Dmc1


C

Biology & Microbiology

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Which observation(s) of the medium ground finch (Geospiza fortis) by Peter and Rosemary Grant verify Darwin's selection hypothesis? Check all that apply.  

_____  Considerable variation existed in the beak size and shape of this finch. _____  The medium ground finch showed assortative mating according to beak size and shape. _____  Beak shape (depth) varied with the dryness of the year. _____  Offspring were similar to parents in beak size and shape.

Biology & Microbiology

Which of the following is not a function of the Drosophila Sxl protein?

A. prevention of the splicing machinery from recognizing the splice junctions of the E1 or L3 exons of the Sxl mRNA B. mediation of alternative splicing that produces transcripts for functional Tra protein C. binding specifically to the regulated 3' splice site of the tra transcript D. mediation of the splice variant of the dsx transcript leading to repression of female-specific genes

Biology & Microbiology

Which is the main antibody in secretions of exocrine glands?

a. IgA b. IgD c. IgE d. IgG e. IgM

Biology & Microbiology

In the experiment above, guppy color patterns (spots) were measured in populations exposed to increasing amounts of predation.  From this you could conclude that ________.

A. predators are less likely to catch and eat brightly colored guppies B. predators do not affect the color patterns of guppies C. predators are more likely to catch and eat brightly colored guppies D. evolutionary changes take millions of years to appear E. brightly colored guppies are more likely to reproduce in the presence of predators

Biology & Microbiology