Tarun Sir
Time- 10 min
12th Molecular basis of inheritance
1. Select the incorrectly matched pair.
(1) Initiation codons - AUG,
(2) Stop codons - UAA,UAG, UGA
(3) Methionine - AUG and GUG
(4) Anticodons -tRNA
2. Which of the following is a function of r RNA?
(1) It is a carrier of genetic information from DNA to ribosomes synthesizing polypeptides.
(2) It carries amino acids to ribosomes.
(3) It is a constituent component of SER
(4) Catalytic role
3. Some amino acids are coded by more than one codon, hence the genetic code is
(1) overlapping (2) degenerate
(3) universal (4) unambiguous.
4. In a mRNA molecule, untranslated regions (UTRs) are present at
(1)5’end (before stopcodon)
(2) 3’- end (after stop codon)
(3) no UTRs present in mRNA.
(4) In between stop and start codon
5. With regard to mature mRNA in eukaryotes
(1) both exons and introns are absent
(2) both exons and introns are present
(3) exons present, introns absent
(4) introns present, exons absent.
6. Which RNA carries the amino acids from the amino acid pool to mRNA during protein synthesis ?
(1) rRNA (2) adaptor
(3) snRNA (4) hnRNA
7. Which RNA has longest life span?
(1) tRNA (2) rRNA
(3) mRNA (4) SnRNA
8. At which end of mRNA translation always begins ?
(1) After UTR at 3’ end
(2) 5’ end before UTS
(3) anywhere on mRNA
(4) 5’ end after UTR
9. All charged tRNA comes at …….. site in Elongation step of translation
(1) P-site (2) A-site
(3) R-site (4) O-site
10. 5 - methyl uracil is name of -
(1) Thymine (2) Uracil
(3) Adenine (4) Guanine
11. Okazaki fragments produced on -
(1) leading strand of DNA
(2) lagging strand of RNA
(3) RNA
(4) lagging strand of DNA
12. Which of the given character is not applicable to tRNA?
(1) Adaptor
(2) smallest
(3) Soluble
(4) catalytic
13. The triplet UUU codes for :
(1) leucine (2) glycine
(3) methionine (4) phenylalanine
14. What would happen if in a gene encoding a polypeptide of 100 amino acids, 2t7th 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) A polypeptide of 26 amino acids will be formed
(4) Two polypedtides of 24 and 25 amino acids will be formed
15. In tRNA, CCA sequence is found at 3’ end and G at 5’ end. This CCA group is
(1) Present from the beginning of tRNA formation
(2) Added after transcription
(3) Added after translation
(4) Added before transcription
16. Clover leaf structure ofrRNA is of
(1) Primary (2) secondary
(3) Tertiary (4) none
17. Ribosome have enzyme to make peptide bond
(1) small subunit
(2) 29s tRNA on large subunit in bacteria
(3) 23s rRNA on large subunit in bacteria
(4) 28s rRNA on large subunit in bacteria
18. Which of these plays an important structural and catalytic role during translation?
(1) tRNA (2) Sn RNA
(3) Genetic RNA (4) rRNA
19. Translation absent in
(1) Eubacteria (2) Eukaryotes
(3) Viruses (4) Archaebacteria
20. Which of the following codons is known asunambiguous ?
(1) UAG (2) UGA
(3) UAA (4) UUU
1. Answer key of DOPA will be available along with
This DOPA
2. 100 days total 100 dopa
3. Syllabus of each DOPA is mentioned on top of each
DOPA
4. DOPA is a random check to give insight of your
preparation level
5. Every DOPA carry new questions based on ncert
6
Answer Key
1.(3)
2.(4)
3.(2)
4.(2)
5.(3)
6.(2)
7.(2)
8 (4)
9 (2)
10 (1)
11. (4)
12. (4)
13. (4)
14. (3)
15. (2)
16. (4)
17. (3)
18. (4)
19. (3)
20. (4)
