One map unit is equal to a recombination frequency of
A) 1%.
B) 5%.
C) 10%.
D) 50%.
E) 100%.
A
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If K+ can exit the cell through leak channels, why don't they flow out until there are equal concentrations on both sides of the membrane?
A. K+ can act as an enzymatic cofactor, and most K+ ions are bound to cellular enzymes. B. The leak channels allow a very slow leak that cannot keep pace with active import of K+ ions. C. Chelator molecules trap K+ on the inside of the membrane. D. The negative electrical potential inside the cell creates a force that holds the K+ ions in.
In viruses, the capsid
a. is composed of DNA or RNA. b. destroys the viral DNA or RNA. c. is never present. d. consists of many genes. e. may be involved in attachment of the virus.
Let us suppose that someone is successful at producing induced pluripotent stem cells (iPS) for replacement of pancreatic insulin-producing cells for people with type 1 diabetes. Which of the following could still be problems? I
the possibility that, once introduced into the patient, the iPS cells produce nonpancreatic cells II. the failure of the iPS cells to take up residence in the pancreas III. the inability of the iPS cells to respond to appropriate regulatory signals A) I only B) II only C) III only D) I, II, and III
Nutrients reach cells in the epidermis by ________
A) moving out of blood vessels that originate in the hypodermis and extend into the epidermis B) moving out of blood vessels in the epidermis C) moving out of dermal blood vessels and diffusing through tissue fluid to the epidermis D) All of the above are true.