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DNA and Genetic Code

Covers the properties of genetic code including codon structure, degeneracy, termination signals, translation machinery, and related molecular biology concepts.

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

When an amino acid is represented by more than one codon, it is called __________.

  1. deaminate
  2. degenerate
  3. universal
  4. commaless
  5. non-overlapping
Question 2 Multiple Choice (Single Answer)

Which of the following codons codes for the same information as UGA?

  1. UAA
  2. AAU
  3. UUU
  4. UCG
  5. UGG
Question 3 Multiple Choice (Single Answer)

Degeneration of genetic code is attributed to __________.

  1. first member of the codon
  2. second member of the codon
  3. third member of the codon
  4. entire codon
  5. the code is non-degenerate
Question 4 Multiple Choice (Single Answer)

UGA, UAG and UAA are called as termination codons because __________.

  1. they terminate anticodons
  2. they are present at the beginning of mRNA
  3. they indicate initiation of translation
  4. they do not specify any amino acid
  5. they terminate mRNA
Question 5 Multiple Choice (Single Answer)

Which of the following has function similar to UGA and UAA?

  1. AUG
  2. UAG
  3. GUG
  4. UUU
  5. AGG
Question 6 Multiple Choice (Single Answer)

Exons help in the synthesis of __________.

  1. proteins
  2. fatty acids
  3. fats
  4. carbohydrates
  5. glycogen
Question 7 Multiple Choice (Single Answer)

Which statement is false about genetic code?

  1. Genetic code is ambiguous.
  2. Genetic code is non-overlapping.
  3. Genetic code is degenerate.
  4. Genetic code is universal.
  5. Genetic code has start/stop signals.
Question 8 Multiple Choice (Single Answer)

Sigma factor is associated with _________.

  1. RNA polymerase
  2. RNA ligase
  3. DNA polymerase
  4. DNA ligase
  5. DNA methylase
Question 9 Multiple Choice (Single Answer)

What is the meaning of triplet codon?

  1. Presence of only three bases in r RNA
  2. A sequence of three bases in m-RNA
  3. A sequence of three bases in t-RNA
  4. A sequence of three bases in DNA.
  5. A sequence of three bases present in m, t or r RNA.
Question 10 Multiple Choice (Single Answer)

What does the degeneracy of genetic code refer to?

  1. One codon has many meanings.
  2. Many codons have the same meaning.
  3. Only two codons share many amino acids.
  4. Third base is not stable.
  5. During translation the genetic code is read one after the other in a sequence.
Question 11 Multiple Choice (Single Answer)

Nonsense codons are called so because they _________.

  1. code for non-essential amino acids
  2. code for initiator amino acid, which is removed later
  3. are never present in the RNA
  4. do not code for any amino acid
  5. code for some special amino acids
Question 12 Multiple Choice (Single Answer)

Out of the total 64 codons, 61 codes for 20 amino acids this suggests ___________.

  1. degeneracy of codons
  2. overlapping of codons
  3. redundancy of codons
  4. ambiguous nature of codons
  5. polarity of genetic code
Question 13 Multiple Choice (Single Answer)

Which pair is correctly matched?

  1. UGG-start codon
  2. UUU-stop codon
  3. AGU-leucine
  4. UUC-isoleucine
  5. UAC-tyrosine
Question 14 Multiple Choice (Single Answer)

Tay sachs disease is an example of which kind of mutation?

  1. Frame shift mutation
  2. Deletion mutation
  3. Addition mutation
  4. Missense mutation
  5. Nonsense mutation
Question 15 Multiple Choice (Single Answer)

Which statement is not true regarding translation machinery?

  1. Anticodon consists of three nucleotides.
  2. Anticodon may pair with more than one codon.
  3. It is the basic unit of genetic code.
  4. tRNA is an adaptor molecule composed of RNA, typically 76 to 90 nucleotides in length.
  5. The covalent attachment to the tRNA 3’ end is catalyzed by enzymes called aminoacyl tRNA synthetases.
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