The following are all functions of a typical plasma membrane except
A. expression of cellular identity
B. selective transport of certain molecules and material
C. reception of information
D. transport of water and bulk material
E. Be permanent in composition
Ans: E. Be permanent in composition
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The Drosophila homeotic genes typically contain the homeobox. The homeobox is a sequence of 180 nucleotides. The number of amino acids coded for by this sequence is
A. 30. B. 60. C. 90. D. 120 E. 180.
The Kd values of antibody-to-antigen binding range from 10-12 M to 10-8 M. Antibody X binds to wild-type E. coli ssDNA-binding protein, showing a value of Kd =10-11 M
When antibody X binds to a mutant derived ssDNA-binding protein that contains a single amino acid substitution, a value of Kd = 10-7 M is determined. We can conclude that: A. the amino acid substitution has increased the affinity of antibody X. B. the amino acid substitution has decreased the affinity of antibody X. C. the amino acid substitution has increased the affinity of ssDNA-binding protein to DNA. D. the amino acid substitution has decreased the affinity of ssDNA-binding protein to DNA. E. None of these choices is correct.
What is the cause of global warming of the earth? a. The accumulation of carbon dioxide, methane, and chlorofluorocarbons
b. The increase of sea temperatures. c. Absorption of radiant energy to the atmosphere. d. The reradiation of energy in the atmosphere.
DNA synthessis
What will be an ideal response?