Which of the following events occurs during mitosis but not during meiosis?
A) Sister chromatids segregate.
B) Homologous chromosomes pair.
C) Crossing-over occurs between homologous chromosomes.
D) Chromosomes align on the metaphase plate.
E) None of the choices is correct.
E) None of the choices is correct.
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Indifferent gonads develop
A) during the first two weeks of prenatal development. B) during the fifth week of prenatal development. C) during the ninth week of prenatal development. D) when the embryo becomes a fetus.
What must occur before a glucose molecule can be broken down to release energy?
a. One ATP molecule must phosphorylate the six carbon sugar. b. Two ATP molecules must phosphorylate the six carbon sugar. c. Three ATP molecules must phosphorylate the six carbon sugar. d. One ATP molecule must be taken away from glucose. e. Two ATP molecules must be taken away from glucose.
The first trophic level of an ecosystem consists of
A) heterotrophs. B) detritus feeders. C) producers. D) secondary consumers. E) primary consumers.
The CAM pathway ____.
A. involves only the Calvin–Benson cycle B. involves only the C4 cycle C. is used by plants in humid regions D. is also known as photorespiration E. needs day and night for completion