Which of the following enzymes is responsible for transcribing tRNA in eukaryotic cells?

A) RNA polymerase I
B) RNA polymerase II
C) RNA polymerase III
D) primase
E) RNase H


Answer: C

Biology & Microbiology

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If an infant is being fed only its mother’s breast milk and if the woman has not experienced her first postpartum menses, then breastfeeding provides _______ protection from pregnancy in the first 6 months following a birth.

If an infant is being fed only its mother’s breast milk and if the woman has not experienced her first postpartum menses, then breastfeeding provides _______ protection from pregnancy in the first 6 months following a birth. [A] 78-85% [B] 70-78% [C] 70% [D] > 98% [E] 85-92% [F] 92-98%

Biology & Microbiology

Which primary succession event led to the formation of the tundra?

a. large tsunamis b. glacial retreat c. volcanic activity d. the breaking up of Pangaea e. large earthquakes

Biology & Microbiology

In cultivated stocks, the cross of a variety of white flower plants produced all red flowers in the F1

generation, but the F2 generation produced 87 red flowers, 31 cream flowers, and 39 white flowers. Explain these results by giving the genotypes possible for each phenotype. What will be an ideal response?

Biology & Microbiology

Restriction enzymes are naturally produced by and isolated from

A. bacteria. B. bacteriophages. C. human cells. D. plant cells.

Biology & Microbiology