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Molecular Basis of Inheritance · Question 9

NEET (UG) 2025MCQMedium📈 Topic in 75% papers+4−1
1

Which of the following are the post-transcriptional events in a eukaryotic cell? Choose the correct answer from the options given below :

  1. B, C, E only
  2. C, D, E only
  3. A, B, C only
  4. B, C, D only

Answer

(4) B, C, D only

Solution

In eukaryotes the primary transcript (hnRNA) is processed in the nucleus:

B. Splicing – introns are removed and exons are joined.

C. Capping – methyl guanosine triphosphate is added at the 5' end.

D. Tailing – adenylate residues (200–300) are added at the 3' end.

A is wrong because only the fully processed mRNA is transported to the cytoplasm, after splicing. E is not a processing step of hnRNA.

Hence B, C and D are correct.

Answer: (4)

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2

Given below are two statements: In the light of the above statements, choose the most appropriate answer from the options given below :

  1. Statement I is correct but statement II is incorrect
  2. Statement I is incorrect but statement II is correct
  3. Both statement I and statement II are correct
  4. Both statement I and statement II are incorrect
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3

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below :

  1. Statement I is correct but statement II is incorrect
  2. Statement I is incorrect but statement II is correct
  3. Both statement I and statement II are correct
  4. Both statement I and statement II are incorrect
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4

Who proposed that the genetic code for amino acids should be made up of three nucleotides?

  1. Jacques Monod
  2. Franklin Stahl
  3. George Gamow
  4. Francis Crick
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5

Histones are enriched with -

  1. Phenylalanine & Leucine
  2. Phenylalanine & Arginine
  3. Lysine & Arginine
  4. Leucine & Lysine
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6

Which factor is important for termination of transcription?

  1. (rho)
  2. (gamma)
  3. (alpha)
  4. (sigma)
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7

The lactose present in the growth medium of bacteria is transported to the cell by the action of

  1. Beta-galactosidase
  2. Acetylase
  3. Permease
  4. Polymerase
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8

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;

  1. Repressor, Operator gene, Structural gene
  2. Structural gene, Transposons, Operator gene
  3. Inducer, Repressor, Structural gene
  4. Promoter, Structural gene, Terminator
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9

Which of the following statement is correct regarding the process of replication in E. coli?

  1. The DNA dependent DNA polymerase catalyses polymerization in one direction that is 3' 5'
  2. The DNA dependent RNA polymerase catalyses polymerization in one direction, that is 5' 3'
  3. The DNA dependent DNA polymerase catalyses polymerization in 5' 3' as well as 3' 5' direction
  4. The DNA dependent DNA polymerase catalyses polymerization in 5' 3' direction
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10

Match List I with List II Choose the correct answer from the options given below:

  1. A-III, B-II, C-I, D-IV
  2. A-III, B-IV, C-I, D-II
  3. A-II, B-III, C-IV, D-I
  4. A-IV, B-II, C-II, D-III
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11

Which one is the correct product of DNA dependent RNA polymerase to the given template? 3'TACATGGCAAATATCCATTCA5'

  1. 5'AUGUACCGUUUAUAGGUAAGU3'
  2. 5'AUGUAAAGUUUAUAGGUAAGU3'
  3. 5'AUGUACCGUUUAUAGGGAAGU3'
  4. 5'ATGTACCGTTTATAGGTAAGT3'
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