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.DNA ligase

2.Primase

3.DNA polymerase

4.Okazaki fragments

Question 1 of 15

Question 2 of 15

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

1.160 million

2.240 million

3.150 million

4.140 million

Question 2 of 15

Question 3 of 15

3. A sub metacentric chromosome has centromere:

1.At the end of a chromosome

2.In the center of chromosome

3.Near an end of chromosome

4.Slightly away from the center of a chromosome

Question 3 of 15

Question 4 of 15

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

1.A DNA primer

2.DNA ligase

3.An RNA primer

4.An Okazaki fragment

Question 4 of 15

Question 5 of 15

5. Chromosomes are composed of

1.70% protein and 30% DNA

2.60% protein and 40% DNA

3.40% protein and 60% DNA

4.50% protein and 50% DNA

Question 5 of 15

Question 6 of 15

6. 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.Watson and Crick

3.Hershy and Chase

4.Avery

Question 6 of 15

Question 7 of 15

7. Chromosomes are made of:

1.DNA + Pectin

2.DNA only

3.RNA + DNA

4.DNA + Histone

Question 7 of 15

Question 8 of 15

8. The anticodon of a particular tRNA molecule is:

1.Catalytic, making the tRNA

2.Complementary to the corresponding triplet in mRNA

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

4.Complementary to the corresponding triplet in rRNA

Question 8 of 15

Question 9 of 15

9. Semi conservative replication refers to the fact that:

1.Certain base pair with specific bases

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

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

4.Genetic information contained in the transforming molecule

Question 9 of 15

Question 10 of 15

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

1.Heat-killed pathogenic cell caused pneumonia

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

3.The polysaccharide coat of bacteria caused pneumonia

4.Bacteriophage injected DNA into bacteria

Question 10 of 15

Question 11 of 15

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

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

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

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

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

Question 11 of 15

Question 12 of 15

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

1.¹⁸F

2.³⁵S

3.³²P

4.¹⁴C

Question 12 of 15

Question 13 of 15

13. Histones have abundance of amino acids

1.Valine and arginine

2.Histidione and threonine

3.Arginine and lysine

4.Valine and lysine

Question 13 of 15

Question 14 of 15

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

1.Depends on the action of NDA polymerase

2.Occurs in the 3’ – 5’ direction

3.Produces Okazaki fragments

4.Progresses away from the replication fork

Question 14 of 15

Question 15 of 15

15. In eukaryotic cells, transcription cannot begin until:

1.The DNA introns are removed from the template

2.DNA nucleases have isolated the transcription unit

3.Several transcription factors have bound to the promoter

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

Question 15 of 15

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