Which of the following contains the three posttranscriptional modifications often seen in the maturation of mRNA in eukaryotes?
A) removal of exons, insertion of introns, capping
B) 5'-poly(A) tail addition, insertion of introns, capping
C) 5'-capping, 3'-poly(A) tail addition, splicing
D) 3'-capping, 5'-poly(A) tail addition, splicing
E) heteroduplex formation, base modification, capping
C
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How does RNA polymerase II bind to the DNA?
a. It binds directly to the eukaryotic promoter sequence. b. It binds directly to the TATA box. c. It binds to transcription factors in the nucleus, and the complex then binds to the promoter. d. Transcription factors first bind to the promoter, then recruit RNA polymerase II. e. Some transcription factors bind to the promoter while others bind to RNA polymerase II, then the two groups of proteins bind to each other.
Most of the somatic cells in the body are structurally and functionally specialized and do not divide
a. True b. False
How does Viagra enhance erectile function of the penis?
a) by preventing cGMP production b) by inhibiting guanylyl cyclase activity c) by inhibiting cGMP phosphatase d) by inhibiting nitric oxide release e) by inhibiting cGMP phosphodiesterase
Mutations in genes that affect __________ may cause morphological shifts in a lineage.
Fill in the blank(s) with the appropriate word(s).