- Diagram represents“flow of information in the cell”.
Choose correct combination of labels.
(A)Replication(E)(D)(C)(B)(a) B - Indicates dsRNA
(b) E - Translocation
(c) D - Enzyme reverse transcriptase
(d) C - Polyamide/Polypeptide- Microbe incapable of growing on minimal nutrient medium is
(a) heteroorganotroph (b) auxotroph
(c) prototroph (d) autotroph. - T ψ C terminus of tRNA is called
(a) ‘most specific’ part of tRNA
(b) enzyme attachment site
(c) ribosomal attachment site
(d) aminoacyl attachment site. - Arrange the following in descending order according to
their sizes.
(a) DNA → Cistron → mRNA → Muton →Recon
(b) DNA → mRNA → Cistron → Recon → Muton
(c) Muton → Recon → Cistron → mRNA → DNA
(d) DNA → Cistron → mRNA → Recon → Muton - Read the following statements (i) to (v).
(i) In transcription, adenine pairs with uracil.
(ii) Human genome has about 98% junk DNA.
(iii) Human gene on an average contains 3000 bps and
there are about 30,000 genes in human genome.
(iv) Y-chromosome of human genome has least number of
genes, i.e., 321 in human genome.
(v) Western blot is used to detect proteins.
How many statements are correct?
(a) 4 (b) 5 (c) 2 (d) 3 - An anticodon of tRNA can recognise more than one codon
of mRNA. It is
(a) Wobble base hypothesis
(b) gene flow hypothesis
(c) template hypothesis
(d) Richmond and Lang effect.- Which of the following is an initiation codon during protein
formation?
(a) 3 ′ GUA 5′ (b) 3 ′ AUG 5′
(c) 5 ′ UAC 3′ (d) 3 ′ UAC 5′ - Polymerisation rate of nucleotides in prokaryotes is _____
during replication of DNA.
(a) 200 bp per minute (b) 2000 bp per second
(c) 200 bp per hour (d) 2000 bp per day - Transcription refers to the
(a) transfer of genetic code of DNA to RNA
(b) formation of DNA from RNA
(c) formation of protein
(d) polymerisation of deoxyribonucleotides in cell-free system. - Identify A, B and C strands.
5 ′
5 ′5 ′^5 ′3 ′3 ′3 ′
3 ′A
BC(a) A-Discontinuous strand, B-Continuous strand,C-Template
strand
(b) A-Leading strand, B-Lagging strand, C-Parental strand
(c) A-5′ – 3′ strand, B-3′ – 5′ strand, C-Parental strand
(d) All of these- Which of the following is/are true regarding genetic code?
(i) 1 st codon decoded was UUU coding for amino acid
phenylalanine.
(ii) There are five punctuations and sixty one coding codons.
(iii) UAA, UGA and AUG are non-sense codons.
(iv) It is non-overlapping, colinear and ambiguous.
(v) Two codons decoded by Hargobind Khorana were UGU
and GUG coding for amino acid cysteine and valine
respectively.
MPP-8 CLASS XII ANSWER KEY
- (d) 2. (b) 3. (a) 4. (a) 5. (c)
- (c) 7. (b) 8. (d) 9. (b) 10. (c)
- (a) 12. (c) 13. (d) 14. (b) 15. (b)
- (b) 17. (c) 18. (d) 19. (a) 20. (a)
- (a) 22. (a) 23. (b) 24. (b) 25. (a)
- (b) 27. (c) 28. (a) 29. (d) 30. (b)
- (d) 32. (b) 33. (b) 34. (c) 35. (d)
- (d) 37. (d) 38. (a) 39. (b) 40. (c)
- Haematococcus nivalis Pg. 15
- Pteridosperms Pg. 20
- Microspheres Pg. 57
- Oligocene Pg. 66
ANSWERS WHO AM I ...