Question

16.   RNAi is a technique that silences genes by targeting them and degrading their mRNA. How can this technique be used in scientific laboratories?

A. RNAi has been used in laboratories to make bacteria more susceptible to antibiotics, but has limited application in eukaryotic cells.

B. RNAi is a powerful tool for degrading mRNA, but because it doesn't degrade other types of RNA, its use is limited.

C. RNAi allows scientists to turn off one gene specifically to study its effect.

D. RNAi is observed in nature, but it can't be used in laboratories.

17.   _______ was a key technique used to explain the structure of DNA.

   A. NMR spectroscopy

B. Electron diffraction

C. X-ray crystallography

D. Electron microscopy

18.   _______ physically links the amino acid with the transcribed mRNA.

A. siRNA

B. tRNA

C. mRNA

D. rRNA

19.   A red and a white snapdragon are crossed, and their offspring is pink. This is an example of

   A. Mendel's law of independent assortment.

B. codominance.

C. Mendel's law of dominance.

D. incomplete dominance

20. The rearrangement of genetic information so that offspring can inherit new genetic combinations is called

A. recombination.

B. replication.

C. gene editing.

D. gene expression.

Answer 1

16- RNA i allows scientist to turn off one gene specifically to study its effect . C

17- X ray crystallography C

18- Codominance B

19- Recombination A