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Molecular Basis of Inheritance · Question 44

NEET (UG) 2022 (Phase 2)MCQMedium📈 Topic in 50% papers+4−1
1

If DNA contained sulfur instead of phosphorus and proteins contained phosphorus instead of sulfur, what would have been the outcome of Hershey and Chase experiment?

  1. Radioactive phosphorus in bacterial cells
  2. No radioactive sulfur in bacterial cells
  3. Both radioactive sulfur and phosphorus in bacterial cells
  4. Radioactive sulfur in bacterial cells

Answer

(4) Radioactive sulfur in bacterial cells

Solution

In the Hershey–Chase experiment only the genetic material (DNA) of the bacteriophage enters the bacterium; the protein coat stays outside and is removed by blending and centrifugation.

Given case: DNA contains sulfur ⇒ DNA would be labelled with radioactive sulfur; protein contains phosphorus ⇒ protein would be labelled with radioactive phosphorus.

∴ DNA (radioactive sulfur) enters the bacterial cells, while the protein (radioactive phosphorus) remains in the supernatant.

⇒ Radioactive sulfur would be found in the bacterial cells.

Answer: (4)

NEET (UG) 2022 (Phase 2)

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2

Against the codon 5' UAC 3', what would be the sequence of anticodon on tRNA?

  1. 5' GUA 3'
  2. 5' AUG 3'
  3. 5' ATG 3'
  4. 5' GTA 3'
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3

If A and C make 30% and 20% of DNA, respectively, what will be the percentage composition of T and G?

  1. T : 20%, G : 20%
  2. T : 20%, G : 30%
  3. T : 30%, G : 20%
  4. T : 30%, G : 30%
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4

Complete the flow chart on central dogma. [figure]

  1. (a) - Transduction; (b) - Translation; (c) - Replication; (d) - Protein
  2. (a) - Replication; (b) - Transcription; (c) - Transduction; (d) - Protein
  3. (a) - Translation; (b) - Replication; (c) - Transcription; (d) - Transduction
  4. (a) - Replication; (b) - Transcription; (c) - Translation; (d) - Protein
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5

What is the role of RNA polymerase III in the process of transcription in eukaryotes?

  1. Transcribes only snRNAs
  2. Transcribes rRNAs (28S, 18S and 5.8S)
  3. Transcribes tRNA, 5S rRNA and snRNA
  4. Transcribes precursor of mRNA
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6

DNA fingerprinting involves identifying differences in some specific regions in DNA sequence, called as

  1. Polymorphic DNA
  2. Satellite DNA
  3. Repetitive DNA
  4. Single nucleotides
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7

Identify the correct statement.

  1. Split gene arrangement is characteristic of prokaryotes
  2. In capping, methyl guanosine triphosphate is added to the 3' end of hnRNA
  3. RNA polymerase binds with Rho factor to terminate the process of transcription in bacteria
  4. The coding strand in a transcription unit is copied to an mRNA
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8

If Adenine makes 30% of the DNA molecule, what will be the percentage of Thymine, Guanine and Cytosine in it?

  1. T : 20 ; G : 25 ; C : 25
  2. T : 20 ; G : 30 ; C : 20
  3. T : 20 ; G : 20 ; C : 30
  4. T : 30 ; G : 20 ; C : 20
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9

Which of the following RNAs is not required for the synthesis of protein?

  1. siRNA
  2. mRNA
  3. tRNA
  4. rRNA
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10

Which is the "Only enzyme" that has "Capability" to catalyse Initiation, Elongation and Termination in the process of transcription in prokaryotes?

  1. DNase
  2. DNA dependent DNA polymerase
  3. DNA dependent RNA polymerase
  4. DNA Ligase
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11

Which one of the following statements about histones is wrong?

  1. Histones carry positive charge in the side chain
  2. Histones are organized to form a unit of 8 molecules
  3. The pH of histones is slightly acidic
  4. Histones are rich in amino acids - Lysine and Arginine
NEET (UG) 2021

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