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

• Fungus

• Bacterium

• Virus

• Plant

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
  
  

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

Select the correct match

• Ribozyme - Nucleic acid

• F₂ × Recessive parent - Dihybrid cross

• G. Mendel - Transformation

• T.H. Morgan - Transduction

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

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

If there are 999 bases in an RNA that codes for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered?

• 1

• 11

• 33

• 33

Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement

• Both are due to a qualitative defect in globin
  chain synthesis

• Both are due to a quantitative defect in globin chain synthesis

• Thalassemia is due to less synthesis of globin molecules

• Thalassemia is due to less synthesis of globin molecules

All of the following are part of an operon except

• an operator

• structural genes

• a promoter

• an enhancer

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