Molecular Biology Genetics MCQs MDCAT 2

Challenge your molecular biology knowledge with this 20-question quiz. Genetics MCQs MDCAT Quiz Covers DNA double helix structure, Okazaki fragments, genetic code degeneracy, mutations, and eukaryotic translation. Let us start with the online Molecular Biology Genetics MCQS MDCAT Quiz Preparation Quiz now

 

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#1. The new strand synthesized in small pieces and then joined together during DNA replication is called

All of these

Leading strand

Dead strand

Lagging strand

#2. The biological process shown in the diagram is

Translation termination

Translation initiation

Replication initiation

Translation elongation

#3. The diameter of the DNA double helix remains constant because of

Phophodiester bond

Deoxyribose sugar

Hydrogen bounding between base paris

Base-pairs always consist of purines and pyrimidine's

#4. Which of the following is non-genetic and is utilized for protein synthesis

None of these

m-RNA

t-RNA

Z-RNA

#5. The DNA molecule had a shape of a helix with a diameter of

2nm

4nm

34A$^\circ$

0.34nm

#6. The three-nucleotide codon system can be arranged into ————— combinations

64

16

20

128

#7. The number of triplet codons having all three bases the same in 64 triplet codons is

2

8

6

4

#8. In RNA, thiamine is replaced by

Adenine

Guanine

Uracil

Thiamine

#9. Each amino acid in a protein is specified by

A codon

An mRNA molecule

Several genes

A promoter

#10. Which of the following is correct regarding the genetic code

Three random nitrogen bases specify the placement of one amino acid

UAA is the nonsense codon which also codes for methionine

UUU is the initiation codon which also codes for phenylalanine

There are 64 triplet codons and only 20 amino acids

#11. UGA codon in mitochondria reads

Methionine

Isoleucine

Tryptophan

Nonsense codon

#12. Length of Okazaki fragments in eukaryotes is a bout

100-200 nucleotides

1000-2000 necleotides

None of these

10-20 nucleotides

#13. The codons which code for the same amino acid are called

Introns

Synonyms

DNA profile

Probes

#14. In a nucleotide having a cytosine base and linked to sugar by a glycosidic bond at carbon number

2

5

1

4

#15. Which of the following RNAs picks up a specific amino acid from the amino acid pool in the cytoplasm to the ribosome during protein synthesis

r-RNA

t-RNA

m-RNA

All of these

#16. What would happen if, in a gene encoding a polypeptide of 50 amino acids, the 25th codon UAU is mutated to UAA?

A polypeptide of 49 amino acids will be formed

Two polypeptides of 24 and 25 amino acids will be formed

A polypeptide of 25 amino acids will be formed

A polypeptide of 24 amino acids will be formed

#17. The number of stop codons which do not code for any amino acids is

3

4

1

2

#18. Which of the following enzymes is present at the replication fork

Ligase

Helicase

DNA polymerase III

Primase

#19. If the DNA in all of the cells of an adult human were lined up end to end, it would stretch nearly

60 times the distance from earth to Jupiter

50 times the distance from earth to jupiter

50 times the distance from earth to moon

60 times the distance from earth to moon

#20. The two polynucleotide chains in DNA are

Discontinuous

Semiconservative

Antiparallel

Parallel

Previous

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Online Molecular Biology & Genetics MCQs MDCAT Quiz

• UGA codon in mitochondria reads
• If the DNA in all of the cells of an adult human were lined up end to end, it would stretch nearly
• The number of stop codons that do not code for any amino acids is
• The number of triplet codons having all three bases the same in 64 triplet codons is
• In a nucleotide having a cytosine base and linked to sugar by a glycosidic bond at carbon number
• The DNA molecule had a shape of a helix with a diameter of
• The diameter of the DNA double helix remains constant because of
• Length of Okazaki fragments in eukaryotes is a bout
• Which of the following enzymes is present at the replication fork
• The codons which code for the same amino acid are called
• In RNA, thymine is replaced by
• Which of the following RNAs picks up a specific amino acid from the amino acid pool in the cytoplasm to the ribosome during protein synthesis
• Which of the following is non-genetic and is utilized for protein synthesis
• Each amino acid in a protein is specified by
• The three-nucleotide codon system can be arranged into ————— combinations
• What would happen if, in a gene encoding a polypeptide of 50 amino acids, the 25th codon UAU is mutated to UAA?
• The biological process shown in the diagram is
• The two polynucleotide chains in DNA are
• Which of the following is correct regarding the genetic code
• The new strand synthesized in small pieces and then joined together during DNA replication is called

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