In a mutation,
a. the new codon may specify a different amino acid, but may not change the function of the
new protein produced.
b. the new codon may specify the same amino acid as the old codon.
c. the new codon and resulting amino acid may destroy the function of the protein specified.
d. the new codon may have no effect.
e. all of these
E
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Which of the following human mutations correlates with resistance to plasmodial infections in West Africa?
A) hemoglobin S B) one particular MHC class I gene C) one particular set of MHC class II genes D) hemoglobin S and particular class I and class II genes
Examine the electron micrograph of the mitochondrion on the right.
(a) What portions of aerobic respiration occur in region a? (b) What substance is produced as hydrogen ions cross from the space between the inner and outer membranes into region a? (c) What portion of cellular respiration takes place in the cytoplasm outside of this cell?
Gamma irradiation has been used to sterilize certain types of foods. There are, however, certain limitations on its effectiveness. One of these is that it will only work on
A. foods that are not in metal cans. B. moist foods. C. dry foods. D. It is effective with all foods.
The two types of bonding found in a DNA
molecule are
a. ionic and covalent. b. covalent and peptide. c. ionic and hydrogen. d. peptide and hydrogen. e. covalent and hydrogen