Which process seems to be the most similar between eukaryotic and prokaryotic genetic regulations?
A) 5'-capping regulation
B) RNA splicing regulation
C) intron/exon shuffling
D) transcriptional regulation
E) poly(A) tail addition
Answer: D
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In the process of RNA editing adenine or cytosine may be deaminated and the result is
A. Adenine is changed to inosine and cytosine is changed to thymidine B. Although both bases are covalenty changed there is no alteration in the tRNAs the modified bases may engage C. The new bases effectively result in new codons D. Answers adenine is changed to inosine and cytosine is changed to thymidine and the new bases effectively result in new codons are correct (Although both bases are covalenty changed there is no alteration in the tRNAs the modified bases may engage is incorrect) E. Answers adenine is changed to inosine and cytosine is changed to thymidine and although both bases are covalenty changed there is no alteration in the tRNAs the modified bases may engage are correct (The new bases effectively result in new codons is incorrect)
Which of the following likely triggered the Holocene extinction?
a. European colonial expansion in the 1600s b. The rising popularity of zoos in the late 1800s c. A large asteroid hitting Earth more than 250 million years ago d. An unprecedented increase of photosynthetic organisms 2.45 billion years ago
Several species of mice occupy the same meadow. One species remains near the stream; one is found almost exclusively among the dense undergrowth; and a third species is mainly seen in the open parts of the meadow. Since these three species of mice can coexist, they are probably demonstrating
a. competitive exclusion. b. competitive inclusion. c. symbiosis. d. resource partitioning. e. habitat division.
A human cell containing two sets of 23 chromosomes is
A) aneuploid. B) polyploid. C) euploid. D) haploid. E) None of these