The distance in the DNA from +1 to the polyadenylation signal for a human gene is 40,000 nucleotide pairs. However, the size of the mature mRNA found associated with a ribosome during translation is 3,000 nucleotides. The most likely explanation for this difference is?
a. a missense mutation in the gene
b. a mutation in the AUG codon to CUG
c. loss of the 5' cap of the mRNA
d. the presence of one or more introns in the gene
Ans: d. the presence of one or more introns in the gene
You might also like to view...
A eukaryotic gene that is regulated by three activator proteins is said to be under
A. triplet regulation. B. individual control. C. self-regulation. D. combinatorial control. E. elastic control.
Referring to the above diagram, what structure
is labeled "C"?
a. the appendix b. the cecum c. a polyp d. a portion of the small intestine e. the colon
In about 9 months, a human develops from a fertilized egg into a fully formed human. During which phase of pregnancy do the lungs complete development?
A) second trimester B) third trimester C) after birth D) first trimester
The ________ and ________ give rise to all of the other cells of the adult plant.
A. bud primordia; leaf primordia B. vascular cambium; cork cambium C. phloem; xylem D. pericycle; bud primordia E. shoot apical meristem; root apical meristem