Which of the following is true of introns?
A. RNA II polymerase transcribes the intronsequences along with exon sequences.
B. More DNA of the human genome is devoted to exons than to introns.
C. Introns are not found in bacteria or archaea, only eukaryotes.
D. When annealing mature mRNA to corresponding chromosomal DNA sequences, the mRNA will form loops with intron sequences looped out.
A
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The gas tail of a comet always
a. trails behind the head along the orbital path. b. extends ahead of the head along the orbital path. c. points toward the Sun. d. points away from the Sun. e. points perpendicular to the orbital path.
If houseplants must be left unattended for a length of time, some people recommend placing plastic bags over them. What is the reasoning behind this?
a. Water tension will decrease. b. The plants won't freeze. c. Photosynthesis will increase because of trapped carbon dioxide. d. Transpiration will be slowed and more water will be retained in the soil. e. The bag will trap oxygen.
Inhibitors of bacterial translation, such as chloramphenicol and erythromycin, usually (Select all that apply.)
A) inhibit mitochondrial protein synthesis. B) inhibit chloroplast protein synthesis. C) inhibit eukaryotic cytoplasmic protein synthesis. D) have no effect on mitochondrial protein synthesis. E) have no effect on chloroplast protein synthesis.
The number of electron pairs shared between carbon 2 and 3 in the accompanying figure is:
a. one.
b. one and a half.
c. two.
d. three.
e. four