The process of joining together different $DNA$ fragments is often referred to as

After $4$ $PCR$ cycles,how many $DNA$ molecules are formed from one $DNA$ template molecule?

$A$: To extract $RNA$ from tomato cells,it must first be treated with cellulase,protease,and then deoxyribonuclease.
$R$: Deoxyribonuclease will digest $DNA$ while $RNA$ will be intact.

Which of the following is not present in a bioreactor?

In a continuous culture system,cells can be maintained in which physiological phase?

In which of the following methods is a probe allowed to hybridize to its complementary $DNA$ in a clone of cells?