Why can the mrna strand made during transcription be thought of as a mirror image of the dna strand from which it was made?

Biology

2 answers:

Marta_Voda [28]3 years ago

8 0

Answer: The mRNA chain is complementry to the DNA molecule and yet it is not identical to it

Explanation:

Expression of a gene implies manufacturing its corresponding protein. It is a multilayered process and this multilayered process has two maib steps. In the first step, the information in DNA is transferred to a messenger RNA (mRNA) molecule by way of a process called transcription. In the transcription process, the DNA of a gene serves as a template for complementary base-pairing, and an enzyme called RNA polymerase II catalyzes the formation of a pre-mRNA molecule, which is then processed and results in the formation of mature mRNA.

The resulting mRNA is a single-stranded copy of the gene, which next must be translated into a protein molecule. During translation, which is the second main step in gene expression, the mRNA is "read" according to the genetic code, which relates the DNA sequence to the amino acid sequence in proteins. Each group of three bases in mRNA comprises of a codon, and each codon specifies a particular amino acid. The mRNA sequence is thus used as a template to assemble in order the chain of amino acids that form a protein. This portion of mRNA is located in between the first nucleotide that is transcribed and the start codon (AUG) of the coding region, and it doesn't affect the sequence of amino acids in a protein.

weqwewe [10]3 years ago

3 0

Answer: because its sequence is complementary to that of the dna

Explanation:

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Answer:

The prokaryote divides by asexual mode of reproduction.

Explanation:

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Following the rules of complementary base pairing, which of these DNA bases could successfully bond with adenine?

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Answer:

Thymine

Explanation:

Adenine is a Purines together with Guanine .

Purines always pair with Pyrimidines ; which are cyosine and Thymine.

This is a complementary base pairing that hold the two strands of DNA bases together by weak hydrogen bonds for flexibility and easily unwind during replication

Purines are larger in size beaxuae they have 2 ring structures while Pyrimidines aee smaller because of one ring structure.

Therefore two purines (Adenine and Guanine can not pair together;

It must be a Purines -Pyrimidines pairs.

Therefore Adenine must pair with Thymine and cyosine with Guanine

In RNA, Thymine are replaced with URACIL as Pyrimidines.

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2 years ago

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A,B AND D are definantly wrong because food and diesease are differences. I belive C is your answer.

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