The trp operon is an example of which type of transcriptional regulation?
A. post translational
B. methylation
C. a repressor which is activated by the presence of the amino acid tryptophan
D. none of the above
C. a repressor which is activated by the presence of the amino acid tryptophan
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_______________ are constructed of all four basic tissue types.
(a) Organs. (b) Systems. (c) Cells. (d) Organelles.
The epithelial tissue of animal cells is most similar to the ________ of plant cells?
A. ground B. dermal C. xylem D. vascular E. phloem
After processing of pre-mRNAs is complete, some regions are retained in finished mRNAs. What are these regions called?
a. exons b. snRNPs c. UTRs d. domains
Enteric hepatitis is fatal for 20% of people in which of the following groups?
A) infants under the age of 1 year B) teenagers C) young adults D) pregnant women E) elderly men