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

Biology & Microbiology

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_______________ are constructed of all four basic tissue types.

(a) Organs. (b) Systems. (c) Cells. (d) Organelles.

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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

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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

Biology & Microbiology

The epithelial tissue of animal cells is most similar to the ________ of plant cells?

A. ground B. dermal C. xylem D. vascular E. phloem

Biology & Microbiology