Why do karyotypes always show chromosomes at the point when cell division is about to occur?
A) The chromosomes are easier to see when they are elongated and uncondensed.
B) This is the time at which the chromosomes are being duplicated.
C) This is the only cell cycle point in which the chromosomes are unduplicated.
D) The chromosomes are fully condensed as cell division approaches.
Answer: D
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In a DNA molecule, the base pairs provide information, and the sugar-phosphate backbone does not, because
A) the base pairs are all the same, but the sugar-phosphate backbone varies. B) there are eight types of base pairs. C) the bases form a sequence, and the sugar-phosphate backbone does not. D) the sugar-phosphate backbone is highly unstable.
In fungal reproduction, sexual fusion refers to
a. the combining of cells of opposite mating types. b. fusion between spores of different mating types. c. fusion between hyphae from fungi of different mating types. d. fusion between haploid nuclei in a dikaryon. e. the dominance of the haploid phase in the fungal life cycle.
Many intracellular receptors are transcription factors; when activated, they activate or repress specific _____
a. genes b. neurons c. kinases d. enyzmes e. ribosomes
The oncogene that causes Burkitt's lymphoma results from:
A. A translocation that moves a proto-oncogene next to an antibody gene B. An inversion that places a proto-oncogene next to a transcription factor gene C. A point mutation in a proto-oncogene D. A virus that inserts next to a proto-oncogene E. A deletion of an anti-oncogene