Found in the nucleus, a _______ is an association of DNA and proteins.
a) cell plate
b) ribosome
c) chromosome
d) centromere
Ans: c) chromosome
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If an organism were a glucose and lactose fermenter, the LIA reaction would be:
a. K/A. b. A/K. c. A/A. d. K/K.
Which type of bonds hold the two chains of DNA together in a DNA molecule?
a. hydrogen b. polar covalent c. nonpolar covalent d. ionic e. peptide
Which of the following statements about the regulation of gene expression in bacteria is false?
a. Genes can be turned on and off as environmental conditions change. b. Constitutive genes producing enzymes that are more stable are transcribed at a slower rate. c. Most gene regulation in bacteria occurs at the level of translation. d. Constitutive genes encoding proteins required in large amounts are transcribed more rapidly than genes for proteins required in smaller amounts. e. Constitutive genes with "strong" promoters bind RNA polymerase more frequently than genes with "weak" promoters
Although most biologists do not consider viruses to be alive, viruses do share some characteristics with living things. Which of the following is the requirement for life that viruses lack?
A) The ability to reproduce on their own B) The ability to move C) Having genetic material D) Having highly ordered structure