With respect to the alleles for sickle cell anemia, which genotype(s) is (are) at a disadvantage to persons residing in
tropical areas of Africa?
a. heterozygous
b. homozygous dominant
c. homozygous recessive
d. both heterozygous and homozygous dominant
e. both homozygous dominant and homozygous recessive
e
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The appendix is a vestigial structure that extends off of the ____
a. cecum b. colon c. duodenum d. rectum e. stomach
the figure above to answer questions 12–14
E 12. A body plan lacking a body cavity is indicated by a. A. b. B. c. C. d. A and B. e. none of these.
All of the following are examples of post-transcriptional regulation except
A) cells can regulate translation by affecting how readily ribosomes associate with mRNA to read it. B) in eukaryotic cells, small noncoding RNAs that work in post-transcriptional regulation include microRNAs and short interfering RNAs. C) cells can regulate translation by methylating certain DNA nucleotides. D) in prokaryotic cells, small noncoding RNAs that work in post-transcriptional regulation include small RNAs. E) cells can regulate how mRNA is spliced and exported out of the nucleus before translation occurs.