Punjab 12th Class Chromosome and DNA Biology Chapter 20 Mcqs Test Online

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Question 1 of 15

Biology

1. A biochemist isolates and purities molecules needed for DNA replication. When DNA is added, replication occurs, but each DNA molecule consists of a normal strand paired with numerous segments of DNA a few hundred nucleotides long. What has probably been left out of the mixture?

1.Okazaki fragments

2.DNA ligase

3.DNA polymerase

4.Primase

Question 1 of 15

Question 2 of 15

2. A typical human chromosome contains __________ nucleotides in its DNA

1.140 million

2.240 million

3.150 million

4.160 million

Question 2 of 15

Question 3 of 15

3. In his work with peneumonia-causing bacteria and mice, Griffith found that:

1.The polysaccharide coat of bacteria caused pneumonia

2.Some substance from pathogenic cells was transferred to non pathogenic cells, making them pathogenic

3.Bacteriophage injected DNA into bacteria

4.Heat-killed pathogenic cell caused pneumonia

Question 3 of 15

Question 4 of 15

4. Whose pioneering work on the gene used the bacteriophage to show that DNA was the part of this virus which went into the bacterial cell for replication?

1.Beadle and Tatum

2.Avery

3.Watson and Crick

4.Hershy and Chase

Question 4 of 15

Question 5 of 15

5. If you want to label amino acids but not DNA, which of the following radioactive isotopes would you use?

1.¹⁸F

2.¹⁴C

3.³²P

4.³⁵S

Question 5 of 15

Question 6 of 15

6. Chromosomes are composed of

1.60% protein and 40% DNA

2.40% protein and 60% DNA

3.70% protein and 30% DNA

4.50% protein and 50% DNA

Question 6 of 15

Question 7 of 15

7. In eukaryotic cells, transcription cannot begin until:

1.The DNA introns are removed from the template

2.Several transcription factors have bound to the promoter

3.DNA nucleases have isolated the transcription unit

4.The two DNA strands have completely separated and exposed the promoter

Question 7 of 15

Question 8 of 15

8. The elongation of the leading strand during DNA synthesis:

1.Progresses away from the replication fork

2.Occurs in the 3’ – 5’ direction

3.Produces Okazaki fragments

4.Depends on the action of NDA polymerase

Question 8 of 15

Question 9 of 15

9. Histones have abundance of amino acids

1.Arginine and lysine

2.Valine and lysine

3.Histidione and threonine

4.Valine and arginine

Question 9 of 15

Question 10 of 15

10. Synthesis of a new DNA strand usually begins with:

1.DNA ligase

2.A DNA primer

3.An RNA primer

4.An Okazaki fragment

Question 10 of 15

Question 11 of 15

11. Semi conservative replication refers to the fact that:

1.Only the DNA of the bacteriophage enters the bacterial cell

2.Genetic information contained in the transforming molecule

3.Certain base pair with specific bases

4.One DNA strand remains while a new one is made

Question 11 of 15

Question 12 of 15

12. Chromosomes are made of:

1.RNA + DNA

2.DNA + Histone

3.DNA + Pectin

4.DNA only

Question 12 of 15

Question 13 of 15

13. What is the basis for the difference in how the leading and lagging strands of DNA molecules are synthesized?

1.Polymerase can only work on one strand at a time

2.The origins of replication occur only at the 5’ end

3.DNA ligase worked only in the 3’ – 5’ direction

4.DNA polymerase can join new nucleotides only to the 3’ end of a growing strand.

Question 13 of 15

Question 14 of 15

14. A sub metacentric chromosome has centromere:

1.Near an end of chromosome

2.Slightly away from the center of a chromosome

3.At the end of a chromosome

4.In the center of chromosome

Question 14 of 15

Question 15 of 15

15. The anticodon of a particular tRNA molecule is:

1.The part of the tRNA bonds to specific amino acid

2.Complementary to the corresponding triplet in mRNA

3.Catalytic, making the tRNA

4.Complementary to the corresponding triplet in rRNA

Question 15 of 15

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