Gap genes of Drosophila embryos:a
organize the embryo into broad regions and influence the activity of pair-rule genes.
b. are missing from the chromosomes of mutant flies.
c. are genes that have moved to gaps on other chromosome during meiosis.
d. cause gaps in the cell cycle.
e. cause the death of embryos before they hatch.
A
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An obligate anaerobe is an organism that:
A. is poisoned by oxygen B. requires oxygen C. can use oxygen but can get along without it D. does not use oxygen but is not poisoned by it E. produces oxygen
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.
If a scientist is conducting a study of how a male bird's song and the female bird's response evolved, what type of causation is she exploring?
A. ultimate causation B. proximate causation C. stereotyped causation D. ethnological causation E. fixed action pattern causation
Ricin is a neurotoxin that is derived from:
A) a synthesized virus or bacterium. B) mash that is left from the castor bean. C) the leaves of the purple foxglove plant. D) the seeds from a wide variety of fruits.