Question

■ The sequence of nitrogen bases in a # segment of a coding strand of DNA is ’ AATGCTTAGGCA. What will be the
sequence of nitrogen bases in the wRNA transcribed by it?
(a) UUA CGA AUC CGU
(b) AAU GCU AAC CGA
(c) AAU GCA AUC CGU
(d) AAU GCU UAG GCA

■ The promoter site and the terminator site for transcription are located at

(a) 3′ (downstream) end and 5′ (upstream) end, respectively of the transcription unit.
(b) 5′ (upstream) end and 3′ (downstream) end, respectively of the transcription unit.
(c) the 5′ (upstream) end.
(d) the 3′ (downstream) end.


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Answer 1

Answer:

The answer will be option (a) for question 1 and option (b) for question 2

Explanation:

A forms H- bond with U and G forms H bond with C in a RNA.

Hope it helps..

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Answer 2

Answer:

For 1st question:

The correct answer is option (A) UUA CGA AUC CGU.

For 2nd question:

The correct answer is option (B) 5′ (upstream) end and 3′ (downstream) end, respectively of the transcription unit.

Explanation:

For question 1:

• DNA forms mRNA by transcription process.

• Here, a sequence of nitrogen bases in DNA is given.

• Nitrogen bases bind to another nitrogen bases in the following way:

1. Adenine binds with thymine and guanine binds with cytosine in case of DNA.
2. Adenine binds with uracil, guanine to cytosine and thymine to adenine in case of RNA.

• Here, from DNA, mRNA is transcribed.

• So, AAT CGA TAG GCA is transcribed to UUA CGA AUC CGU.

For question 2:

• The promoter site is present on 5' to the upstream to initiate the transcription process.

• While the terminator site is present on 3' site to the downstream and terminate or stop the process of transcription.

So, the correct option is 5′ (upstream) end and 3′ (downstream) end, respectively of the transcription unit.

To learn more about DNA polymerase,

https://brainly.in/question/7095592

To learn more about functions of DNA,

https://brainly.in/question/22838312

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