NEET · Biology · STD 12 - 5. molecular basis of inheritance

A transcription unit in \(DNA\) is defined primarily by the three regions in \(DNA\) and these are with respect to upstream and down stream end;

A Structural gene, Transposons, Operator gene
B Inducer, Repressor, Structural gene
C Promotor, Structural gene, Terminator
D Repressor, Operator gene, Structural gene

Verified Solution

Answer & Solution

Correct Answer

(C) Promotor, Structural gene, Terminator

Step-by-step Solution

Detailed explanation

A transcription unit of \(DNA\) is defined primarily by the three regions in the \(DNA\): (\(i\)) A promoter

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Match the following enzymes with their functions

\((a)\) Restriction endonuclease	\((i)\) Joins the \(DNA\) fragements
\((b)\) Restriction exonuclease	\((ii)\) Extends primers on genomic \(DNA\) template
\((c)\) \(DNA\) ligase	\((iii)\) Cuts \(DNA\) at specific position
\((d)\) Taq polymerase	\((iv)\) Removes nucleotides from the ends of \(DNA\)

Select the correct option from the following

NEET 2019 Medium

In sea urchin \(DNA\), which is double stranded, \(17\%\) of the bases were shown to be cytosine.The percentages of the other three basesexpected to be present in this \(DNA\) are

NEET 2015 Medium

Match List I with List II:

List - I	List - II
(a) Alfred Hershey and Martha Chase	(i) Streptococcus pneumoniae
(b) Euchromatin	(ii) Densely packed and dark-stained
(c) Frederick Griffith	(iii) Loosely packed and light-stained
(d) Heterochromatin	(iv) DNA as genetic material confirmation

Choose the correct answer from the options given below:

NEET 2025 Medium

Match the following organisms with the products they produce

\((a)\) Lactobacillus	\((i)\) Cheese
\((b)\) Saccharomyces cerevishe	\((ii)\) Curd
\((c)\) Aspergillus niger	\((iii)\) Citric Acid
\((d)\) Acetobacter acet \(\quad\)	\((iv)\) Bread
	\((v)\) Acetic Acid

Select the correct option. \((a)\quad (b)\quad (c)\quad (d)\)

NEET 2019 Medium

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From NEET

Match List \(I\) with List \(II\) .

List \(I\)	List \(II\)
\(A\). Frederick Griffith	\(I\). Genetic code
\(B\). Francois Jacob and Jacque Monod	\(II\). Semi-conservative mode of DNA replication
\(C\). Har Gobind Khorana	\(III\). Transformation
\(D\). Meselson and Stahl	\(IV\). Lac operon

Choose the correct answer from the options given below:

NEET 2024 Medium

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