One of the advantages of chorionic villus sampling (CVS) over amniocentesis is that CVS


A) samples amniotic fluid.

B) can never be lethal.

C) poses lesser risk to the fetus.

D) provides earlier results.


D) provides earlier results.

Biology & Microbiology

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Transcription in prokaryotes is carried out by ______, which unwind(s) and transcribe(s) the gene.  

A.  RNA synthetase B.  RNA polymerase II C.  RNA polymerase III D.  transcription factors E.  RNA polymerase

Biology & Microbiology

Monoclonal antibodies may be used to

a. treat mononucleosis. b. screen for prostate cancer. c. produce genetically modified bacteria. d. clone interferons. e. treat infected lab mice.

Biology & Microbiology

What type of enzyme seals the newly added (repaired) DNA to the rest of the DNA molecule?

A. ligase B. helicase C. DNase D. primase E. polymerase

Biology & Microbiology

The enzyme used to make a DNA copy complementary to processed mRNA is

A. reverse transcriptase. B. transcriptase. C. DNA polymerase. D. RNA polymerase.

Biology & Microbiology