In sickle cell Hb, which chain is affected?
Correct answer B. Beta Chain
Topic / 40 questions
Chromosome and DNA MCQs
Chromosome and DNA MCQs cover the structure of DNA, how it is copied, how chromosomes package it, and the classic experiments that proved DNA is the genetic material. They are aimed at MDCAT and NEET candidates, and every question shows the correct answer the moment you choose an option.
- Biological Molecules 74
- Coordination and Control 72
- Biology Diagnostic 70
- Cell Structure and Function 67
- Biotechnology 65
- Reproduction 58
- Bioenergetics 55
- Circulation 50
- Inheritance 48
- Digestion 45
- Immunity 45
- Support and Movement 45
- Acellular Life (Viruses) 45
- Homeostasis 45
- Respiration and Gaseous Exchange 45
- Evolution 45
- Enzymes 45
- Cell Cycle 41
- Chromosome and DNA 40
- Biology Introduction 38
- Ecosystem 27
X-Ray diffraction pattern of DNA was prepared by
Correct answer A. Rosalind Franklin
Which of the following cal kill mice if injected separately?
Correct answer C. Live S type pneumococcus
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Centromere represents
Correct answer A. Primary constriction
A sugarcane cell has ____ chromosomes.
Correct answer D. 80
Sex chromosomes were 1″ discovered in
Correct answer C. Fruitfly
Which is incorrect about nucleosome
Correct answer B. 8 histones as acidic proteins
Molecular basis of sickle cell anaemia was found by
Correct answer C. Vernone Ingram
Phenylketonuria is due to deficiency of
Correct answer B. Phenylalanine hydroxylase
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Strand of DNA which is not transcribed is called
Correct answer C. Coding
Point mutations are represented as
Correct answer C. Alteration in sequence of DNA nucleotide
Examples of chromosomal aberrations are
Correct answer D. Both a and b
Initiation complex in translation is composed of
Correct answer A. Ribosome and aminoacyl-tRNA
Three nucleotide sequence on tRNA that specifies an amino acis is
Correct answer B. Anticodon
In mitochondria UGA is/specifies as
Correct answer B. Tryptophan
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Methionine is specified by
Correct answer D. Both b and c
Which 3 codons are nonsense codons?
Correct answer B. UGA,UAG,UAA
In eukaryotes newly synthesized mRNA
Correct answer D. Both a and c
Human cell contains ____ different kinds of tRNA molecules
Correct answer C. 45
In prokaryotes there are
Correct answer D. Both a and b
About Chromosome and DNA MCQs
This topic sits at the heart of molecular biology in entry test syllabi. Questions cover the components of DNA, including deoxyribose sugar, phosphate and the bases adenine, guanine, cytosine and thymine, and the semi-conservative model of replication confirmed by Meselson and Stahl. Griffith's transformation experiment with smooth and rough pneumococcus strains in mice also appears, together with the enzymes of replication in E. coli such as DNA polymerase III. You will also see the gene as a nucleotide sequence coding for a polypeptide and the molecular basis of sickle cell anaemia identified by Vernon Ingram. These facts are frequently tested in medical entry tests.
Exams that include Chromosome and DNA MCQs
Pakistan
- MDCAT
- ETEA
- NTS
- Lecturer tests
India
- NEET UG
- CUET
- ICAR AIEEA
Bangladesh
- Medical admission test (MBBS)
- University admission tests (DU, RU, JU)
Frequently asked questions
What does semi-conservative replication of DNA mean?
Semi-conservative replication means each new DNA molecule contains one original parental strand and one newly made strand. The two strands of the double helix separate, and each acts as a template for a complementary strand. Meselson and Stahl confirmed this model in 1958 using heavy and light nitrogen isotopes in E. coli.
Which enzyme is the main replicating enzyme in E. coli?
DNA polymerase III is the main enzyme that synthesises new DNA strands during replication in E. coli. DNA polymerase I removes RNA primers and fills the gaps, while DNA ligase joins Okazaki fragments on the lagging strand. Exam questions often test which polymerase does which job.
How many Chromosome and DNA MCQs are on MCQs360?
MCQs360 currently offers 41 Chromosome and DNA MCQs in its MCAT Biology section. You can attempt them free without signing up, and each shows its answer instantly, which helps you revise genetics facts quickly before MDCAT or NEET.
Last reviewed October 2026