PYQSide ExamsMy practice

Molecular Basis of Inheritance · Question 140

AIPMT 2004MCQMedium📈 Topic in 75% papers+4−1
1

The following ratio is generally constant for a given species :-

  1. A+CT+G
  2. G+CA+T
  3. A+GC+T
  4. T+CG+A

Answer

(2) G+CA+T

Solution

As per Chargaff's rule, in double-stranded DNA A = T and G = C.

⇒ A+GC+T, A+CT+G and T+CG+A are all equal to 1 in every organism, so they do not characterise a species.

⇒ The ratio G+CA+T differs from species to species but is constant for a given species.

Answer: (2)

AIPMT 2004

Keep practising — Molecular Basis of Inheritance

2

DNA fingerprinting refers to :-

  1. Techniques used for molecular analysis of different specimens of DNA
  2. Analysis of DNA samples using imprinting devices
  3. Molecular analysis of profiles of DNA samples
  4. Techniques used for identification of fingerprints of individuals
AIPMT 2004
3

The telomeres of eukaryotic chromosomes consist of short sequences of

  1. Adenine rich repeats
  2. Cytosine rich repeats
  3. Thymine rich repeats
  4. Guanine rich repeats
AIPMT 2004
4

What would happen if in a gene encoding a polypeptide of 50 amino acids, 25th codon (UAU) is mutated to UAA?

  1. A polypeptide of 49 amino acids will be formed
  2. A polypeptide of 25 amino acids will be formed
  3. Two polypeptides of 24 and 25 amino acids will be formed
  4. A polypeptide of 24 amino acids will be formed
AIPMT 2003
5

What does "lac" refer to in what we call the lac operon?

  1. The number 1,00,000
  2. Lac insect
  3. Lactase
  4. Lactose
AIPMT 2003
6

During translation initiation in prokaryotes, a GTP molecule is needed in:

  1. Association of 30S-mRNA with formyl-met-tRNA
  2. Formation of formyl-met-tRNA
  3. Association of 50S subunit of ribosome with initiation complex
  4. Binding of 30S subunit of ribosome with mRNA
AIPMT 2003
7

Which one of the following triplet codes, is correctly matched with its specificity for an amino acid in protein synthesis or as 'start' or 'stop' codon?

  1. UUU – Stop
  2. UAC – Tyrosine
  3. UGU – Leucine
  4. UCG – Start
AIPMT 2003
8

During transcription, the DNA site at which RNA polymerase binds is called:

  1. Receptor
  2. Regulator
  3. Enhancer
  4. Promoter
AIPMT 2003
9

Degeneracy of a genetic code is attributed to the:

  1. Second member of a codon
  2. Third member of a codon
  3. First member of a codon
  4. Entire codon
AIPMT 2003
10

In the genetic code dictionary, how many codons are used to code for all the 20 amino acids:

  1. 64
  2. 20
  3. 60
  4. 61
AIPMT 2003
11

In a DNA percentage of thymine is 20% then what is the percentage of guanine : -

  1. 40%
  2. 20%
  3. 30%
  4. 60%
AIPMT 2002

All Molecular Basis of Inheritance PYQs →

PDFDownload Molecular Basis of Inheritance PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All NEET Botany chapters
Class 11The Living WorldBiological ClassificationPlant KingdomMorphology of Flowering PlantsAnatomy of Flowering PlantsCell: The Unit of LifeCell Cycle and Cell DivisionTransport in PlantsMineral NutritionPhotosynthesis in Higher PlantsRespiration in PlantsPlant Growth and Development
Class 12Reproduction in OrganismsSexual Reproduction in Flowering PlantsPrinciples of Inheritance and VariationMolecular Basis of InheritanceStrategies for Enhancement in Food ProductionMicrobes in Human WelfareOrganisms and PopulationsEcosystemBiodiversity and ConservationEnvironmental Issues
Other chaptersBiomolecules (Biology)