If you view a cell in which the genetic material is beginning to be visible as separate bodies, and the nucleolus has disappeared from view, you may surmise that the cell is in
a. telophase.
b. anaphase.
c. prophase
d. metaphase
e. interphase.
C
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Which of the following statements about communication in the White-Crowned Sparrow is not correct?
A. The White-Crowned Sparrow's song is an advertisement display behavior. B. The White-Crowned Sparrow's song is learned by imprinting, a sensitive period that takes place about 10–50 days after hatching. C. During the learning phase, the White- Crowned Sparrow's subsong is a sequence of unstructured twittering. D. If a tape of another species song, for example the Swamp Sparrow, is played during the sensitive period, the White- Crowned male will learn that song. E. If deprived of hearing the adult male's song during the early sensitive period, the bird will continue to sing an unstructured twittering throughout its life.
If the frequency of PKU, an autosomal recessive disease, is 1% in males, what is the frequency of females with PKU? (You may assume that the population is in Hardy-Weinberg equilibrium.)
What will be an ideal response?
Suppose that the human insulin protein that was produced by the bacteria was much shorter than it should be. Upon further investigation, it was found that the DNA of the human insulin gene had a mutation while in the bacterial cells. What type of
mutation could not result in these observations? A) nucleotide insertion B) silent mutation C) nucleotide deletion D) nonsense mutation
Which of the following statements is TRUE of the ligands of nuclear receptors?
a) They are usually large peptides b) They directly activate transcription factors. c) They prevent receptors from entering the nucleus d) They are blocked by the cell membrane