In prokaryotes, the form of RNA polymerase that can accurately initiate synthesis of RNA is called
A. RNA polymerase II.
B. the holoenzyme.
C. the core polymerase.
D. RNA polymerase III.
E. the sigma subunit.
Answer: B
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Genes that encoded for polymerases, gyrases, ribosomal proteins, and other proteins essential to replication, transcription, and translation are present on
A) chromosomes. B) plasmids. C) chromosomes and plasmids. D) neither chromosomes nor plasmids.
The major function of the body of the vertebra is
A) transferring weight along the axis of the vertebral column. B) allowing twisting motions. C) protection of the spinal cord. D) providing support. E) providing a passageway for nerves.
What happens at higher altitudes?
a. The concentration of oxygen decreases.
b. The concentration of carbon dioxide increases. c. The partial pressure of oxygen decreases. d. The partial pressure of carbon dioxide increases. e. There is no change in the concentration or partial pressures of atmospheric gases.
Which of the following features characterizes diatoms?
a. laminarin and oils as food reserves b. protective plates of cellulose in their cells c. chlorophylls a and c and carotene d. paramylon as a food storage molecule