Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

 Multiple Choice QuestionsMultiple Choice Questions

281.

Which of the following is commonly used as a vector for introducing a DNA fragment in human lymphocytes?

  • Retrovirus

  • Ti plasmid

  • pBR 322

  • λ phage


A.

Retrovirus

Retrovirus is commonly used as vector for introducing a DNA fragment in human lymphocyte.

Gene therapy: Lymphocyte from the blood of the patient are grown in culture outside the body, a functional gene is introduced by using a retroviral vector, into these lymphocyte.


282.

The experimental proof for semiconservative replication of DNA was first shown in a

  • Fungus

  • Bacterium

  • Virus

  • Plant


B.

Bacterium

Semi-conservative DNA replication was first shown in Bacterium Escherichia coli by Matthew Meselson and Franklin Stahl.


283.

Many ribosomes may associate with a single mRNA to form multiple copies of a polypeptide simultaneously. Such strings of ribosomes are termed as

  • Polysome

  • Polyhedral bodies

  • Nucleosome

  • Plastidome


A.

Polysome

The phenomenon of association of many ribosomes with single m-RNA leads to the formation of polyribosomes or polysomes or ergasomes.


284.

Select the correct match

  • Ribozyme - Nucleic acid

  • F2 × Recessive parent - Dihybrid cross

  • G. Mendel - Transformation

  • T.H. Morgan - Transduction


A.

Ribozyme - Nucleic acid

A ribozyme is a catalytic RNA, which is a nucleic acid.


285.

Which of the following pairs is wrongly matched?

  • Starch synthesis in pea: Multiple alleles

  • ABO blood grouping: Co-dominance

  • T.H. Morgan: Linkage

  • XO type sex determination: Grasshopper


A.

Starch synthesis in pea: Multiple alleles

Starch synthesis in pea is controlled by a pleiotropic gene.


286.

Which of the following is true for nucleolus?

  • Larger nucleoli are present in dividing cells

  • It is a membrane-bound structure

  • It is a site for active ribosomal RNA synthesis

  • It takes part in spindle formation


C.

It is a site for active ribosomal RNA synthesis

The nucleolus is a non-membranous structure and is a site of r-RNA synthesis.


287.

All of the following are part of an operon except

  • an operator

  • structural genes

  • a promoter

  • an enhancer


D.

an enhancer


288.

AGGTATCGCAT is a sequence from the coding strand of a gene. What will be the corresponding sequence of the transcribed mRNA?

  • AGGUAUCGCAU

  • UGGTUTCGCAT

  • UCCAUAGCGUA

  • ACCUAUGCGAU


A.

AGGUAUCGCAU

Coding strand and mRNA has same nucleotide sequence except, ‘T’ – Thymine is replaced by ‘U’–Uracil in mRNA.