NEET : Multiple Choice questions: Genetic Code
1. Genetic code is three set of nucleotide present on
A. DNA B. mRNA
C. tRNA D. rRNA
C. tRNA D. rRNA
Answer: B Explanation
2. Genetic code is
A. Three set of nucleotide present on mRNA.
B. Used to transform the information present on mRNA in form of polypeptide chain
C. relationship of amino acid sequences in a polypeptide chain and base sequence of DNA.
D. All of the above
Answer: D Explanation
3. Who of the following gave a proposition by 4 x4 x4 = 64 and stated that there are 64 codon to code 20 amino acids
A. George Gamow
B. H. G. Khorana
C. Marshall Nirenberg
D. Ochoa
Answer: A Explanation
4. George Gamow was associated with the field of
A. Chemistry B.Physics
C. Biochemistry D. Genetics
Answer: B Explanation
5. Out of 64 codon or genetic code, twenty amino acids are coded by the what number of codon.
A. 64 B. 61 C. 62. D. 60
Answer: B Explanation
6. Who of the following developed chemical method for the synthesising RNA molecule with a defined combination of bases including copolymers and homopolymers.
7. Marshall Nirenberg deciphered the genetic code used in protein synthesis in
A. Cell free system
B. Bacterial pathogen system
C. Viral system
D. Intra cellular system
Answer: A Explanation
8. Severo ochoa enzyme is helpful in polymerising the RNA with define sequences . This enzyme is called
A. Polynucleotide phosphorylase enzyme
B. Oxidoreductase enzyme
C. Phospho dehydrogenase enzyme
D. Nuclease enzyme
Answer: A Explanation
9. A genetic code "UUU" would code the amino acid phenylalanine from bacteria to human beings. This statement reflect that genetic code is :
A. Universal B. Degenerate
C. Triplet D. Unambiguous
Answer: A Explanation
10. Which of the following pairs is not correctly matched.
A. One amino acid is coded by more than one codon: Degenerate.
B. One genetic code Codes only one amino acid : Unambiguous
C. Genetic code is made up of three nucleotide : Triplet
D. Genetic code is read in continuous manner : universal
Answer: A Explanation
11. Consider the following statement and select the correct code
1. AUG has dual function.
2. It act as initiation codon.
3. It codes phenylalanine
A. 1 and 2 B. 2 and 3
C 1 and 3 D. 1, 2 and 3
Answer: A Explanation
12. Given below are two statements and select the correct option
Statement I : Out of 64 codon, only 61 are used to code amino acids
Statement Il : UAA, UAG, UGA do not code any amino acids.
A. Statement l is true and statement ll is false.
B. Statement l is false and statement ll is true.
C. Both statement I and II is true.
D. Both statement I and II is false.
Answer: C Explanation
13. Which one of the following statement is not correct.
A. UAA, UGA & UAG are non sense or stop codon.
B. They do not code any amino acids.
C. These are absent in Prokaryotes.
D. They terminates the synthesis of polypeptide chain during protein synthesis.
Answer: C Explanation
14. Match the list
( Codon) ( Amino acid)
A. UUU 1. Methionine
B. AUG 2. Valine
C. GAG. 3. Glutamic acid
D. GUG 4. Phenylalanine
A B C D
A. 1 2 3 4
B. 1 3 2 4
C. 4 1 3 2
D. 4 3 1 2
Answer: C Explanation
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