Which of these does not occur in a cell during the mitotic cell cycle?
A. Centromeres separate.
B. Chromosomes line up in single file.
C. Cytoplasm is divided.
D. Sister chromatids pair up and join at the centromere.
E. Two daughter nuclei are formed
Answer: D. Sister chromatids pair up and join at the centromere.
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Fitness is a measure of reproductive success. If an individual with genotype BB produces 6 offspring, and a heterozygous individual (Bb) produces 10 offspring, and a third individual with genotype bb produces 5 offspring, what is the fitness value for the individual with BB genotype?
A. 1.0. B. 0.5. C. 0.6. D. 0.4. E. 1.1
In a case of positive feedback, an increase in the stimulus causes ______ in the response and does not result in homeostasis.
A. a slight decrease B. an increase C. no change D. a large decrease
A scientist performs an experiment in which they create an artificial cell with a selectively permeable membrane through which only water can pass. They inject a 5 M solution of glucose into the cell and then place the cell into a beaker of water. After an hour, what effect do you expect to observe?
A. water moves out of the cell B. glucose moves out of the cell C. glucose moves into the cell D. water moves into the cell E. no net change in cell weight
Terrestrial vertebrates and some fish evolved a form of fertilization in which the male gametes are introduced into the female reproductive tract. What is this called?
A. internal fertilization B. synchronous fertilization C. external fertilization D. asexual fertilization