DNA replication occurs
a. between the gap phases of interphase.
b. immediately after cytoplasmic division.
c. during prophase of mitosis.
d. between mitosis and G1.
e. after the S phase of interphase
A
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All of the following bones are part of the appendicular skeleton except the ________
a. pelvic girdle b. humerus c. tibia d. vertebral column
What did the researchers conclude based on the data in figure (a)?
A. Endostatin shrunk tumors without development of resistance.
B. Endostatin shrunk tumors but resistance developed.
C. Cyclophosphamide delayed the growth of tumors without development of resistance.
D. Cyclophosphamide delayed the growth of tumors but resistance developed.
E. Tumors in untreated cells shrank in size.
A lipid is a(n) ____
a. polar hydrocarbon b. polar peptide c. nonpolar peptide d. ionic polar hydrocarbon e. nonpolar hydrocarbon
Which of the following best describes the mechanism that causes stomata to open?
A) Water accumulates below the opening and eventually causes the stoma to open. B) A large bubble of oxygen accumulates below the stoma and eventually causes it to open. C) Two guard cells flanking each stoma control its opening by changing shape. D) The internal pressure of xylem sap expands the leaf, stretching the stoma open.