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
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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.
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
Which is the main antibody in secretions of exocrine glands?
a. IgA b. IgD c. IgE d. IgG e. IgM
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