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Over [174]
4 years ago
6

Explain why there is a lagging strand (during DNA Replication).

Biology
2 answers:
posledela4 years ago
4 0

Answer:

DNA strands have a directionality, and the different ends of a single strand are called the "3' end" and the "5' end." These terms refer to the carbon atom in ribose to which the next phosphate in the chain attaches. In addition to being complementary, the two strands of DNA are antiparallel: they are orientated in opposite directions. This directionality has consequences in DNA synthesis, because DNA polymerase can only synthesize DNA in one direction by adding nucleotides to the 3' end of a DNA strand.

in DNA replication, the leading strand is defined as the new DNA strand at the replication fork that is synthesized in the 5'→3' direction in a continuous manner.

on the other hand ,The lagging strand is the DNA strand at the opposite side of the replication fork from the leading strand, running in the 3' to 5' direction. Because DNA polymerase III cannot synthesize in the 3'→5' direction, the lagging strand is synthesized in short segments known as Okazaki fragments.

Explanation:

Nadya [2.5K]4 years ago
3 0

there's a lagging strand during DNA replication when the DNA synthesis becomes discontinuous.

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Which RNA sequence will result from the transcription of the DNA sequence AAT TTC CGA ATG GGA?
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Answer:

A. UUA AAG GCU UAC CCU

Explanation:

Transcription is the first process of Gene expression, which involves the synthesizing of a mRNA molecule from a DNA strand. This process (transcription) which is carried out or catalyzed by an enzyme called RNA polymerase, uses the complementary base pairing rule to synthesize nucleotides.

The complementary base pairing rule as proposed by Chargaff states that Adenine base (A) should bond with Thymine base (T). Likewise for Guanine (G) and Cytosine (C). Hence, in a DNA strand with sequence: AAT TTC CGA ATG GGA, the following RNA will result:

UUA AAG GCU UAC CCU.

Note that, Uracil base replaced Thymine base in the mRNA molecule.

Since; A-U and G-C

AAT TTC CGA ATG GGA ---------- DNA

UUA AAG GCU UAC CCU --------- RNA

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