What is the function of tRNA molecules during translation?
A) They unzip double-stranded mRNA.
B) They serve as the starting point for RNA polymerase.
C) They carry amino acids to the ribosome.
D) They encode the instructions for protein synthesis.
C
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Within chromosomes, DNA is wrapped around proteins called
a. karyotypes. b. chromatids. c. nucleosomes. d. centromeres. e. histones.
Which of the following did plants develop to deter predation by herbivores on land?
a. Metabolizing carbon dioxide b. Developing more rigid cell walls c. The emergence of thorns, spines, and toxic chemicals d. Alternation of generations between haploid and diploid
The three most common shapes of bacteria are:
a. Star-shaped, cubical, and spherical b. Spherical, rod-shaped, and spiral c. Cubical, spiral, and thread-like d. Rod-shaped, star-shaped, and cubical e. Cubical, spherical, and rod-shaped
Ants following a trail to the sugar bowl in your kitchen are doing so because of
A. an innate knowledge of where the sugar can be found. B. a dance done by an ant in the anthill. C. chance alone. D. operant conditioning. E. a pheromone pathway laid down by previous ants.