19. 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 allows scientists to turn off one gene specifically to study its effect.
b. rnai is observed in nature, but it can't be used in laboratories
c. rnai has been used in laboratories to make bacteria more susceptible to antibiotics, but has limited application in eukaryotic cells
d. rnai is a powerful tool for degrading mrna, but because it doesn't degrade other types of rna, its use is limited.

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

Explanation:

RNAi is widely used technique for silencing the genes by targeting them and then degrading their mRNA. It silence the genes so that their functions could be studied. It is extensively used in research and can be utilized for any gene just by designing RNAi for that specific gene. It can silence a single genes which make it more useful not only in labs but also in therapeutic approaches for treatment of diseases, cancers etc.

surface mining destroys mountain tops, landscapes, forests and wildlife habitats. on top of that, it leads to soil erosion and destruction of agricultural land. the landscape changes can also disrupt river channels and streams, which leads to flooding. which, can destroy plant life and other animals as well.

explanation: