Back to MOLECULAR BASIS OF INHERITANCE

Your Progress

0 / 201 Answered

Correct

Incorrect

Accuracy

NEET • BIOLOGY • MOLECULAR BASIS OF INHERITANCE

Molecular basis of inheritance practice · Medium

Choose an answer to check it, or open “View answer” to study the explanation. Sign in to save progress to your account.

Practice format and chapter quiz

The practice player uses single-correct-answer MCQs. Chapter quizzes help you review a topic; they are not full-length NEET mock papers.

Take a chapter quiz →

Showing 151-180 of 201 questions

Preparing practice and saved progress…

151 Medium

151 of 201

Understanding +4 | -1

Promoter in a transcription unit is located at

View answer and explanation

Correct option: C

{5^1}

end upstream of coding strand

Option C (

{5^1}

end upstream of coding strand) is correct because the promoter is located at the 5' end upstream of the coding strand in a transcription unit.

152 Medium

152 of 201

Application +4 | -1

The base sequence in mRNA transcribed from DNA having base sequence

5^{\prime}

CTTAG

3^{\prime}

in its coding strand would be

View answer and explanation

Correct option: D

5' CUUAG 3'

Option D (5' CUUAG 3') is correct because mRNA is transcribed from the template strand, and the coding strand is identical to the mRNA sequence (with U replacing T).

153 Medium

153 of 201

Understanding +4 | -1

In lac operon which gene transcribe mRNA for polypeptide synthesis.

View answer and explanation

Correct option: C

Structural gene

Option C (Structural gene) is correct because the structural genes (lacZ, lacY, lacA) are transcribed into a single mRNA molecule, which is then translated into the respective polypeptides.

154 Medium

154 of 201

Remembering +4 | -1

Which of the following enzyme is used in DNA multiplication?

View answer and explanation

Correct option: D

DNA polymerase

Option D (DNA polymerase) is correct because DNA polymerase is the enzyme responsible for synthesizing new DNA strands by adding nucleotides to the 3' end of a growing strand.

155 Medium

155 of 201

Understanding +4 | -1

DNA can be formed by

View answer and explanation

Correct option: C

RNA dependent DNA polymerase

Option C (RNA dependent DNA polymerase) is correct because it describes the enzyme that synthesizes DNA using an RNA template.

156 Medium

156 of 201

Understanding +4 | -1

From his transformation experiment Griffith concluded with transforming principle might be?

View answer and explanation

Correct option: D

None

Option D (None) is correct because Griffith concluded that there was a transforming principle, but he didn't identify it as DNA. He only knew that something was being transferred from the heat-killed S strain to the R strain.

157 Medium

157 of 201

Analyzing +4 | -1

Assertion: RNA produced during transcription
in eukaryotic cells cannot be straight away used
in photosynthesis.

Reason: RNA splicing phenomena helps in the
removal of exons.

View answer and explanation

Correct option: C

If Assertion is true but Reason is false

Option C (If Assertion is true but Reason is false) is correct because RNA produced during transcription in eukaryotic cells needs processing, but RNA splicing removes introns, not exons.

158 Medium

158 of 201

Understanding +4 | -1

(A) : Retroviruses mutate and evolve faster

(R) : Retrovirus have RNA genome

View answer and explanation

Correct option: A

Both (A) and (R) are true and (R) is the correct explanation of (A)

Option A is correct because retroviruses mutate faster due to their RNA genome, which lacks proofreading mechanisms.

159 Medium

159 of 201

Remembering +4 | -1

Among the pyrimidines, this is common for both DNA and RNA?

View answer and explanation

Correct option: B

Cytosine

Option B (Cytosine) is correct because cytosine is a pyrimidine base found in both DNA and RNA.

160 Medium

160 of 201

Remembering +4 | -1

In bacterium, permease is located in?

View answer and explanation

Correct option: C

cell membrane

Option C is correct because permease is a membrane protein located in the cell membrane of bacteria.

161 Medium

161 of 201

Remembering +4 | -1

In bacterium E. Coli function of this is clearly not known?

View answer and explanation

Correct option: A

Transacetylase

Option A is correct because the function of transacetylase in E. coli is not clearly known.

162 Medium

162 of 201

Understanding +4 | -1

Choose the correct pair of RNA type and its function.

View answer and explanation

Correct option: B

rRNA – Plays catalytic role during translation

Option B (rRNA – Plays catalytic role during translation) is correct because rRNA, specifically within the ribosome, catalyzes the formation of peptide bonds during translation.

163 Medium

163 of 201

Analyzing +4 | -1

Identify the statements pertaining to the regulatory genes (R), associated with the lac operon that are incorrect.

(i) mRNA is transcribed from the R gene whether lactose is present or not.

(ii) mRNA is transcribed from the R gene only when the lactose is present.

(iii) mRNA is transcribed from the R gene only when the lactose is not present.

(iv) Lactose inhibits the translation or R gene mRNA.

View answer and explanation

Correct option: D

(ii), (iii) and (iv)

Option D ((ii), (iii) and (iv)) is correct because the regulatory gene (R) is transcribed constitutively (always), and lactose does not inhibit its translation.

164 Medium

164 of 201

Application +4 | -1

RNA formed from the transcription of DNA has base sequence

5^{\prime}

AUUAUGAAA

3^{\prime}

. What would be the sequence of coding strand of DNA?

View answer and explanation

Correct option: C

5' ATTATGAAA 3'

Option C (5' ATTATGAAA 3') is correct because the coding strand of DNA has the same sequence as the RNA transcript, except T replaces U.

165 Medium

165 of 201

Understanding +4 | -1

DNA replication is
(A) Polymerization of nucleotides by DNA-dependent DNA polymerase activity
(B) Energetically very expensive process.
(C) Polymerization of ribonucleotides in 5'→3' direction

View answer and explanation

Correct option: B

Only (A) and (B) is correct

Option B is correct because DNA replication involves polymerization by DNA-dependent DNA polymerase and is energetically expensive.

Explore Other Chapters in BIOLOGY

View All →

ANIMAL KINGDOM 756 MCQs PLANT KINGDOM 415 MCQs ANATOMY OF FLOWERING PLANTS 404 MCQs CHEMICAL COORDINATION AND INTEGRATION 387 MCQs PRINCIPLE OF INHERITANCE AND VARIATION 374 MCQs EVOLUTION 362 MCQs

166 Medium

166 of 201

Remembering +4 | -1

\mathrm{hn}

RNA undergoes two additional processing. Out of which, in one of them an unusual nucleotide (methyl guanosine triphosphate) is added to the 5’ – end of

\mathrm{hn}

RNA. This is known as

View answer and explanation

Correct option: A

Capping

Option A (Capping) is correct because it describes the addition of methyl guanosine triphosphate to the 5' end of hnRNA.

167 Medium

167 of 201

Remembering +4 | -1

In the structure of polynucleotide chain, phosphoester linkage joins

View answer and explanation

Correct option: B

A phosphate group to nucleoside

Option B (A phosphate group to nucleoside) is correct because the phosphoester linkage connects a phosphate group to the sugar (nucleoside) in the polynucleotide chain.

168 Medium

168 of 201

Remembering +4 | -1

Ribose sugar is present in

View answer and explanation

Correct option: D

RNA and ATP

Option D (RNA and ATP) is correct because ribose sugar is a component of both RNA and ATP molecules.

169 Medium

169 of 201

Remembering +4 | -1

Expressed Sequence Tags (ESTs) refers to:

View answer and explanation

Correct option: A

Genes expressed as RNA

Option A (Genes expressed as RNA) is correct because Expressed Sequence Tags (ESTs) are short DNA sequences that correspond to genes that are actively being transcribed into RNA.

170 Medium

170 of 201

Remembering +4 | -1

In E. Coli, complete DNA replication requires?

View answer and explanation

Correct option: C

19 minutes

Option B is correct because, under optimal conditions, E. coli can complete DNA replication in approximately 20 minutes.

171 Medium

171 of 201

Understanding +4 | -1

The process of translation of mRNA to proteins begins as soon as :

View answer and explanation

Correct option: B

The small subunit of ribosome encounters mRNA

Option B (The small subunit of ribosome encounters mRNA) is correct because translation begins when the small ribosomal subunit binds to the mRNA.

172 Medium

172 of 201

Application +4 | -1

Template strand of DNA has -GAG- in normal case. If it is mutated to -GTG- which amino acid will be incorporated in the polypeptide

View answer and explanation

Correct option: D

Valine

Option D (Valine) is correct because the mutated DNA sequence -GTG- corresponds to the mRNA codon CAC, which codes for valine.

173 Medium

173 of 201

Understanding +4 | -1

Assertion : Genetic code is universal.

Reason : Genetic code is same for all organisms.

View answer and explanation

Correct option: A

If both Assertion and Reason are true and
Reason is the correct explanation of Assertion

Option A (If both Assertion and Reason are true and Reason is the correct explanation of Assertion) is correct because the genetic code being universal means it's the same across all organisms.

174 Medium

174 of 201

Remembering +4 | -1

During splicing of hnRNA, introns are removed by the help of

View answer and explanation

Correct option: B

An SnRNA and protein complex

Option B (An SnRNA and protein complex) is correct because snRNPs (small nuclear ribonucleoproteins), which are complexes of snRNA and proteins, are responsible for splicing hnRNA.

175 Medium

175 of 201

Remembering +4 | -1

Number of base pairs of DNA helix in a typical nucleosome?

View answer and explanation

Correct option: A

200

Option A (200) is correct because a typical nucleosome contains approximately 200 base pairs of DNA.

176 Medium

176 of 201

Application +4 | -1

What will be the sequence of mRNA produced by the following stretch of DNA?
3’ ATGCATGCATGCATG 5’ Template strand
5’ TACGTACGTACGTAC 3’ Coding strand

View answer and explanation

Correct option: B

5’ UACGUACGUACGUAC 3’

Option B (5’ UACGUACGUACGUAC 3’) is correct because the mRNA sequence will be the same as the coding strand, except that Thymine (T) is replaced by Uracil (U).

177 Medium

177 of 201

Understanding +4 | -1

Sickel – cell anemia is?

View answer and explanation

Correct option: B

Caused by a change in a single base pair of DNA

Option B (Caused by a change in a single base pair of DNA) is correct because sickle cell anemia is caused by a single nucleotide substitution in the beta-globin gene.

178 Medium

178 of 201

Understanding +4 | -1

Select the correct statement regarding protein synthesis

View answer and explanation

Correct option: A

When the small subunit of the ribosome encounters an mRNA the process of translation begins

Option A (When the small subunit of the ribosome encounters an mRNA the process of translation begins) is correct because the binding of the small ribosomal subunit to mRNA is the first step in translation.

179 Medium

179 of 201

Understanding +4 | -1

Which of the following is not applicable to genetic code?

View answer and explanation

Correct option: B

Ambiguous

Option B (Ambiguous) is correct because the genetic code is specific, meaning each codon codes for only one amino acid, thus it is not ambiguous.

180 Medium

180 of 201

Understanding +4 | -1

In E. Coli, the lac operon gets switched on when?

View answer and explanation

Correct option: A

Lactose is present and it binds to the repressor

Option A (Lactose is present and it binds to the repressor) is correct because lactose, when present, binds to the repressor protein, preventing it from binding to the operator and allowing transcription to occur.

Revision notes and key takeaways

Review MOLECULAR BASIS OF INHERITANCE in your textbook or class notes, then use this set to check your understanding.

Showing 151-180 of 201 questions

Your Progress

Molecular basis of inheritance practice · Medium

Explore Other Chapters in BIOLOGY

Continue Your Practice

Your practice