What type of normal human cell contains 22 autosomes and a Y chromosome?
A) egg cell
B) somatic cell of a female
C) somatic cell of a male
D) sperm cell
D
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Which of the following is not true of the three operators of the lac operon?
A. One of the operators is contained within the lacZ gene. B. All three operators are bound simultaneously by the Lac repressor to repress the expression of the operon. C. The DNA between the operators bound by the Lac repressor is looped out to sterically hinder RNA polymerase. D. Two of the three operators are upstream of the transcriptional start site.
The plural for genus is
a. genus. b. geni. c. genera. d. gena. e. genae.
You are studying an individual with very low levels of insulin in her blood. Further analysis indicates that cells of her pancreas are producing normal levels of this protein, but it is accumulating in the cytoplasm rather than being secreted from the cells. Which hypothesis makes the most sense to explain this observation?
A. A missense mutation has caused premature termination during translation of this protein. B. A missense mutation has altered the ribosome-binding sequence at the 5' end of the mRNA. C. A two-base deletion near the middle of the gene has altered the reading frame during translation of the protein. D. A small deletion has removed the nucleotides that code for the signal sequence at the amino terminus of the protein. E. A chromosomal segment that includes the gene for insulin has been inverted.
Which of the following determines the molecular properties and the types of chemical reactions in which a molecule participates?
A) Functional group B) Hydrogen ion concentration C) Hydrogen atoms D) Carbon skeleton