HEREDITY
MUTATIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A DNA sequence is read by RNA polymerase, which produces another RNA strand complementary to the first strand.
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Two free-floating single strands of DNA are joined by polymerase. The polymerase finds the point at which the two strands will match up into a double strand.
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Messenger RNA are decoded by a ribosome to produce an amino acid chain. In the cell’s cytoplasm, transfer RNA join the messenger RNA, forming a polypeptide.
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A double-stranded DNA molecule is unwound into single strands. Polymerase matches the right nucleotides to the single strand so that each forms a double strand of DNA.
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Detailed explanation-1: -Replication occurs in three major steps: the opening of the double helix and separation of the DNA strands, the priming of the template strand, and the assembly of the new DNA segment. During separation, the two strands of the DNA double helix uncoil at a specific location called the origin.
Detailed explanation-2: -So, the correct answer is ‘DNA synthesis takes place mainly by DNA–polymerase I in E. coli’.
Detailed explanation-3: -Each new double strand consists of one parental strand and one new daughter strand. This is known as semiconservative replication. When two DNA copies are formed, they have an identical sequence of nucleotide bases and are divided equally into two daughter cells.
Detailed explanation-4: -This 3D animation shows you how DNA is copied in a cell. It shows how both strands of the DNA helix are unzipped and copied to produce two identical DNA molecules.