AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

DNA MAKES RNA MAKES PROTEIN

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What must happen to the DNA molecule before mRNA can be created?
A
DNA must duplicate itself
B
the 2 DNA strands must separate
C
DNA needs to exchange bases with RNA
D
nothing needs to happed to the DNA molecule
Explanation: 

Detailed explanation-1: -This mRNA molecule carries DNA’s message from the nucleus to ribosomes in the cytoplasm, where proteins are assembled. However, before it can do this, the mRNA strand must separate itself from the DNA template and, in some cases, it must also undergo an editing process of sort.

Detailed explanation-2: -First, a so-called initiator protein unwinds a short stretch of the DNA double helix. Then, a protein known as helicase attaches to and breaks apart the hydrogen bonds between the bases on the DNA strands, thereby pulling apart the two strands.

Detailed explanation-3: -The two DNA strands must be separated before DNA replication or transcription can occur. is double-stranded, whereas DNA is not. may double back and base pair with itself, whereas DNA does not. is never single-stranded, whereas DNA may or may not be.

Detailed explanation-4: -DNA biosynthesis occurs when a cell divides, in a process called replication. It involves separation of the DNA double helix and subsequent synthesis of complementary DNA strand, using the parent DNA chain as a template.

There is 1 question to complete.