Retrotransposons reverse the effects of transposons.

a. true
b. false


Ans: b. false

Biology & Microbiology

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Which of the following is true of the structure

labeled “A”? a. It is composed of tubulin subunits. b. It is composed of actin subunits. c. It is a microtubule. d. It is an intermediate filament. e. It is a major component of muscle cells.

Biology & Microbiology

Nucleosomes are best described as:

a. eukaryotic DNA associated with histone proteins. b. prokaryotic DNA associated with nonhistone proteins. c. eukaryotic DNA associated with nonhistone proteins. d. prokaryotic DNA associated with histone proteins. e. eukaryotic DNA associated with scaffolding proteins.

Biology & Microbiology

Which of the following is a normally correct base pairing in transcription? 

A. (DNA)A...U(mRNA) B. (mRNA)C...G(tRNA) C. (DNA)U...A(mRNA) D. (DNA)A...T(tRNA)

Biology & Microbiology

The structure that absorbs nutrients from the small intestines and delivers the nutrients in the blood to the liver is the

A. hepatic portal vein. B. hepatic portal artery. C. renal vein. D. None of the choices are correct.

Biology & Microbiology