Male gametophytes are produced by which of the following processes?
A. gametogenesis
B. microsporophyte generation
C. meiosis
D. neither mitosis nor meiosis
E. mitosis
Answer: E
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Vinblastine, a chemotherapeutic drug used to treat breast and testicular cancers, interferes with the assembly of
microtubules. Speculate how this drug works to inhibit cancer cell growth.
a. Vinblastine inhibits transition from G1 to S. b. Vinblastine inhibits transition from S to G2. c. Vinblastine inhibits cytokinesis. d. Vinblastine disrupts mitotic spindle formation and consequently mitosis. e. Vinblastine inhibits cyclin production.
During exhalation, the diaphragm _______.
A. contracts and moves down B. relaxes and moves up C. relaxes and moves down D. contracts and moves up
The structure in Figure 41-1 that is specialized to receive stimuli and send signals to the cell body islabeled:a
1.
b. 4.
c. 5.
d. 6.
e. 7.
Evolutionary adaptations for survival on land produced tetrapods, which later evolved into
A) amphibians only. B) amphibians, reptiles, and mammals. C) reptiles only. D) birds only.