In replication, once the DNA strands have been separated, reformation of the double helix is prevented by:
a. DNA helicase enzyme.
b. single-strand binding proteins.
c. DNA polymerases.
d. ATP.
e. DNA primase.
b
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Which of the following methods of genetic recombination is common to both eukaryotic and bacterial cells?
A. Crossing over B. Vertical gene transfer C. Gamete fusion D. All of the choices are correct.
You are a genetic counselor, and a couple comes to you with concerns that if they have a child together, he or she
could have hemophilia. The man has an X-linked recessive form of hemophilia, but the woman does not. Genetic tests reveal the woman is not a carrier for hemophilia. How should you advise them?
a. Half of their children will have hemophilia. b. All of their sons and half of their daughters will have hemophilia. c. None of their children will have hemophilia, but all of their daughters will be carriers for hemophilia. d. Each of their sons will have a 50% chance of having hemophilia, and each of their daughters will have a 50% chance of being carriers.
e. All of their sons will have hemophilia, and all of their daughters will be carriers.The pituitary gland is controlled by the
a. pons. b. corpus callosum. c. medulla. d. thalamus. e. hypothalamus.
A single-ring nitrogenous base found in DNA and RNA
What will be an ideal response?