What happens when cells cannot repair the damage caused by a mutagen?
a. the organism is not affected
b. the organism is affected temporarily
c. the DNA base sequence is not affected
d. the DNA base sequence changes permanently
Ans: d. the DNA base sequence changes permanently
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The immediate ancestors of plants were:
A. charophyceans B. red algae C. kelp D. cyanobacteria E. dinoflagellates with plastids
The photic zone in aquatic environments is typically about how deep?
A. 10 m B. 50 m C. 100 m D. 500 m E. 1000 m
Four of the five answers listed below possess electrons in the third orbital. The atomic number is at the
right of the element. Select the exception. a. sodium (11) b. magnesium (12) c. chlorine (17) d. nitrogen (7) e. sulfur (16)
Cyclin-dependent kinases (Cdk's) catalyze the phosphorylation of targeted proteins, a process that
a. decreases the mass of the protein. b. makes the targeted proteins hydrophobic. c. changes the shape and function of the targeted proteins. d. gives the proteins a three-dimensional shape. e. blocks the cell cycle from proceeding.