Which cell does NOT belong with the others?
a. erythrocytes
b. neutrophils
c. lymphocytes
d. eosinophils
e. macrophages
A
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The helix-turn-helix motif found in many regulatory proteins fits into the side of a DNA molecule. If a
newly discovered enzyme has a helix-turn-helix motif, you would predict that
a. this enzyme has multiple peptide chain subunits. b. this enzyme is probably able to bind to RNA, too. c. this enzyme probably binds to DNA. d. this enzyme has an allosteric regulator. e. this enzyme is a polymerase that helps synthesize new DNA sequences.
The brief reversal of the electric gradient
across a neuron’s plasma membrane is called a(an)
a. action potential. b. resting potential. c. kinetic potential. d. threshold potential. e. energy potential.
The first amino acid of a new polypeptide chain is
a. alanine. b. cysteine. c. variable. d. phenylalanine.
e. methionine.Which of the following describes the delivery of pollen to the stigma?
A) fertilization B) double fertilization C) germination D) pollination