If a Drosophila female has a homozygous mutation for a maternal effect gene, _____
A) she will not develop past the early embryonic stage
B) all of her offspring will show the mutant phenotype, regardless of their genotype
C) only her male offspring will show the mutant phenotype
D) only her female offspring will show the mutant phenotype
B
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You arrive late to a biological seminar. However, just as you enter the room, you hear the speaker referring to the "five-prime end" and the "three-prime end" of a macromolecule. Immediately, you know that they are talking about a:
A. carbohydrate. B. protein. C. DNA. D. lipid.
Which one of the following is a major difference between integrins and cadherins?
A. Integrins are integral membrane proteins, whereas cadherins are not. B. Cadherins are found in cellular junctions, whereas integrins are not. C. Integrins allow cells to adhere to extracellular matrix, whereas cadherins do not. D. Cadherins associate with intermediate filaments, whereas integrins do not.
The type of reproductive isolation in which the offspring matures to adulthood but is unable to produce offspring is
A) hybrid infertility. B) gametic isolation. C) temporal isolation. D) mechanical isolation. E) hybrid inviability.
Figure 4.23A
The structure labeled A in the accompanying figure ____.
A. prevent movement of materials between cells B. are found in tissues subjected to stretching C. allow the free passage of materials between cells D. are found mostly in heart muscle E. are found in most tissues except in the stomach