Question

When a molecule of double-stranded dna undergoes replication, it results in
a. one double-stranded dna molecule composed only of entirely new strands.
b. three double-stranded dna molecules, each composed of sections of old and new strands.
c. two double-stranded dna molecules, each composed of one new and one old strand.
d. four double-stranded dna molecules, each composed only of old strands of dna?

Answer 1

two double stranded dna molecules, each composed of one new and one old strand 

Answer 2

Ans. (C). two double-stranded dna molecules, each composed of one new and one old strand.

DNA replication can be defined as a process that involves formation of two DNA replica molecules (exact copies) from one parent DNA molecule.The double-stranded parent DNA molecule gets separated and provides two template DNA strands for daughter strands synthesis.

Enzyme DNA polymerase adds nucleotides complementary to template strands and synthesize daughter strands. Hence, two double-stranded DNA molecules are formed, each having one old and one new strand.