12:During DNA electrophoresis, DNA molecules pass through agarose or acrylamide

Question

12:During DNA electrophoresis, DNA molecules pass through agarose or acrylamide gel, which separates the molecules according to size. True or False

13.Reverse Transcriptase synthesizes a DNA molecule from an RNA template. True or False

14. In active transport, the affinity of any given bindinding site for the molecule to be transported changes as the site goes from facing one side of the membrane to facing the other side. True or False

15. Because of the active transport of Na+ and K+ , the intracellular concentration of Na+ is lower than the the extracellular concentration, whereas the reverse is true for

K+. True or False

NOTE: Please the above questions are True or False questions. Which ones are Tue and which ones are false

Explanation / Answer

12. TRUE.

(Explanation - Gel electrophoresis is a lab technique which is used to separate charged molecules with respect to their size. This occurs because the movement of the smaller molecules is much faster than the larger molecules which travel very slowly. This difference in pace of movement of the molecules separates them by size.)

13. TRUE
(Explanation - The generation of DNA from a RNA template catalysed by an enzyme known as reverse transcriptase is called Reverse Transcription. It mainly takes place in retroviruses. It is so named because it causes reversion of the flow of normal genetic information i.e. from DNA to RNA.)

15. TRUE.

(Explanation - Active transport helps the body to maintain the balance of intracellular and extracellular ion concentration. The intracellular Na+ concentration is much lower than the extracellular Na+ concentration . As a result of which, Na+ enters the cell through Na+ channels by passive transport. On the other hand, K+ concentration is much higher inside of the cells which result in exit of K+ ions from the cells. )

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