The initial effect of ionizing radiation on a cell is that it causes
A) DNA to break.
B) bonding between adjacent thymines.
C) base substitutions.
D) the formation of highly reactive ions.
E) the cells to get hot.
D
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The earliest RNA probably functioned in
A) catalysis. B) self-replication. C) both catalysis and self-replication. D) neither catalysis nor self-replication.
What typically stops the process of translation?
A. Rho proteins B. Aminoacyl tRNA synthase C. rRNA D. Stop codons E. Introns
Fleshy fruits, such as blueberries, usually aid seed dispersal by ____
a. catching in the hair or feathers of animals b. being buried by animals c. falling directly under the parent plant d. floating away from the parent plant e. being eaten by animals
The lateral line is part of the system to
a. process light. b. sense electrical currents in the water. c. control balance. d. detect vibrations. e. detect dissolved substances.