The structure labeled 3 in Figure 35-2 is:
a. the secondary xylem.
b. formed by the division of the vascular cambium.
c. found adjacent to the pith.
d. usually referred to as wood.
e. the cork cambium.
B
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Which of the following is not true of the stringent response?
A. Uncharged tRNA binds to the A site of the ribosome. B. Stringent factor binds to the ribosome. C. ppGpp nucleotide is synthesized in two steps. D. ppGpp binding to the ribosome increases rRNA gene expression.
The peptides presented by MHC class II peptide molecules are
A. from plasma cells. B. exogenous antigens. C. endogenous antigens. D. from T helper cells.
The width of a DNA double helix
a. is constant. b. is narrower where adenine is present than where cytosine is present. c. is wider where purines are present than where pyrimidines are present. d. varies randomly. e. is wider where pyrimidines are present than where purines are present.
According to the text, __________ major mass
extinction(s) and recovery(ies) has(have) taken place in the past. a. 1 b. 2 c. 3 d. 4 e. 5