During the splicing reaction, the intron-exon junctions are recognized by
A. miRNAs.
B. the lariat.
C. the branch point.
D. snRNPs.
E. SRP RNAs.
Answer: D
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All of the following are model organisms, except
A) Saccharomyces cerevisiae. B) Drosophila melanogaster. C) Caenorhabditis elegans. D) Arabidopsis thialana. E) Homo sapiens.
Which of the following statements is
CORRECT?
a. A population cannot exceed the carrying capacity even temporarily. b. An organism can occupy more than one trophic level, depending upon the feeding habits of the organism. c. Once populations of organisms become isolated, they remain so by various types of isolation mechanisms. d. The limits of a population are all traced to climatic or physical factors. e. Organisms with different evolutionary backgrounds can occupy the same niche at the same time.
Which of the following is NOT true of
gametophytes? a. They are haploid plants. b. They produce gametes. c. They are the result of sexual reproduction. d. They are a stage in the life cycle of plants. e. Their gametes are either male or female.
Secretion of potassium and ammonium ions occurs mainly in the portion of Figure 48-3 labeled:
a. 2.
b. 5.
c. 7.
d. 9.
e. 10.