The cytoskeleton
A. helps maintain cell shape.
B. anchors organelles.
C. provides architectural support.
D. functions in movements of the cytoplasm.
E. All of the choices are correct.
Answer: E
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During crossing over in meiosis, an unequal exchange of genetic material occurs. This would most likely produce
A. a deficiency in one homologue and a duplication in the other homologue. B. a deficiency in both homologues. C. a deficiency in one homologue and an inversion in the other homologue. D. a reciprocal translocation. E. a duplication in one homologue and an inversion in the other homologue.
This animal has the fewest genes, the simplest
body plan, and only four cell types. It is a
a. planarian. b. placozoan. c. annelid. d. roundworm. e. sponge
The ____ is/are a plant’s main line of defense against viral infection
a. immune cells b. viral toxins within the central vacuole c. membrane proteins that latch onto virus particles d. thick cell wall that prevents viral entry e. nuclear membrane that is impermeable to viruses
How many genes does a human Y chromosome carry?
a. 100 b. 1,400 c. 2,800 d. 14,000 e. 28,000