What is the function of the histones that are found in a chromosome?
A) They bind nucleotides together to form a single strand of DNA.
B) They hold the DNA strands together in a form called the double helix.
C) They contain the genes that code for various traits.
D) They provide support for the DNA to form into a supercoiled structure.
D
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As a biologist, you are researching a population of moles. In the course of your research, you identify a nearby population that occasionally comes into contact with your study population. What best describes the evolutionary process at work?
A. mutation B. natural selection C. artificial selection D. gene flow E. genetic drift
Which of the following is the most error-prone of the repair mechanisms?
A. Photoreactivation B. SOS repair C. Recombination repair D. Postreplication repair
In corn, having ligules (L) is dominant to liguleless (l), and green leaves (G) is dominant to white leaves (g). If a pure-breeding liguleless plant with green leaves is crossed to pure-breeding plant with ligules and white leaves, predict the proportion of F2 progeny with the genotype Ll gg.
A) 1/16 B) 1/8 C) 1/4 D) 1/2 E) Cannot be determined
Which enzyme links nucleotides into a new stand of DNA?
a. DNA ligase b. DNA mutase c. DNA polymerase d. DNA primer e. DNA replicase