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3 years ago

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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1 year ago

If an average person produces 2 million red blood cells per second, how many red blood cells will be produced in a 24 hours peri

asambeis [7]

I believe the answer is 172,800,000,000 per day (24 hours)

How I Got That Answer:

I calculated 2 million times 60

=120000000 per minute

Then I calculated that times 60 again

=7200000000 per hour

Then I calculated that times 24

=172800000000 per day

8 0

3 years ago

What are the 5 roles of bacteria in nature?

Anuta_ua [19.1K]

Bacteria are involved in oxygen and food production, environment recycling and cleanup, and in health maintenance and medicine production.

7 0

2 years ago

In dna replication, the new strand of dna that is synthesized in one continuous piece .

leva [86]

In DNA replication, the new strand of dna that is synthesized in one continuous piece is called the leading strand

6 0

2 years ago

Which of the following processes occurs in eukaryotic gene expression?RNA polymerase requires tRNA to elongate the molecule.mRNA

nignag [31]

Answer:

A cap is added to the 5 end of the mRNA

Explanation:

In prokaryotes, the translation process takes place simultaneously with the transcription but the mRNA molecule after synthesis undergoes some post-translation modification which protects the mRNA from the cytosolic environment.

One of these modifications is known as capping which refers to the addition of the cap at 5' end of the mRNA. This cap is added by an enzyme called guanyl transferease and protects the end of the mRNA.

Thus, the selected option is correct.

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3 years ago