A membrane protein that is embedded in the plasma membrane is called
a) integral
b) peripheral
c) stationary
d) allosteric
Ans: a) integral
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A plasmid cloning vector and DNA fragments containing the XYZ gene, each digested with the same restriction
enzyme, are mixed with DNA ligase. Which product(s) will result?
a. recombinant plasmids only b. nonrecombinant plasmids only c. joined-together copies of the DNA fragment containing the XYZ gene only d. a mixture of recombinant plasmids, nonrecombinant plasmids, and joined-together copies of the DNA fragment containing the XYZ gene e. no reaction will occur because DNA polymerase rather than DNA ligase is needed to insert the DNA fragments into the plasmid cloning vector
Referring to the figure showing helper T cell function, which statements are true? (Check all that apply.)
_____ Cytokines are produced in both diagrams.
_____ Antigens play a role in both diagrams.
_____ Naïve cells are involved in diagram I.
_____ The humoral response is represented in diagram II.
Body cells of human males contain _____
a. one X chromosome b. two X chromosomes c. one Y chromosomes d. two Y chromosomes e. one X and one Y chromosome
The value of inserting human genes suspected of
causing Alzheimer disease into mice is to a. make mice act more human. b. make antibodies, which can be injected into suffering patients. c. develop mice that can serve as models for study of this condition. d. use the mice for production of a vaccine for the disease. e. accomplish all of these.