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.Okazaki fragments

3.DNA polymerase

4.Primase

Question 1 of 15

Question 2 of 15

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

1.³⁵S

2.³²P

3.¹⁴C

4.¹⁸F

Question 2 of 15

Question 3 of 15

3. Semi conservative replication refers to the fact that:

1.Genetic information contained in the transforming molecule

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

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

4.Certain base pair with specific bases

Question 3 of 15

Question 4 of 15

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

1.240 million

2.140 million

3.160 million

4.150 million

Question 4 of 15

Question 5 of 15

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

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

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

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

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

Question 5 of 15

Question 6 of 15

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

1.Depends on the action of NDA polymerase

2.Produces Okazaki fragments

3.Occurs in the 3’ – 5’ direction

4.Progresses away from the replication fork

Question 6 of 15

Question 7 of 15

7. Chromosomes are composed of

1.50% protein and 50% DNA

2.40% protein and 60% DNA

3.60% protein and 40% DNA

4.70% protein and 30% DNA

Question 7 of 15

Question 8 of 15

8. Histones have abundance of amino acids

1.Histidione and threonine

2.Valine and arginine

3.Valine and lysine

4.Arginine and lysine

Question 8 of 15

Question 9 of 15

9. In eukaryotic cells, transcription cannot begin until:

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

2.The DNA introns are removed from the template

3.DNA nucleases have isolated the transcription unit

4.Several transcription factors have bound to the promoter

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. The anticodon of a particular tRNA molecule is:

1.Catalytic, making the tRNA

2.Complementary to the corresponding triplet in rRNA

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

4.Complementary to the corresponding triplet in mRNA

Question 11 of 15

Question 12 of 15

12. 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.Avery

2.Beadle and Tatum

3.Hershy and Chase

4.Watson and Crick

Question 12 of 15

Question 13 of 15

13. Chromosomes are made of:

1.RNA + DNA

2.DNA only

3.DNA + Histone

4.DNA + Pectin

Question 13 of 15

Question 14 of 15

14. A sub metacentric chromosome has centromere:

1.Near an end of chromosome

2.In the center of chromosome

3.At the end of a chromosome

4.Slightly away from the center of a chromosome

Question 14 of 15

Question 15 of 15

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

1.A DNA primer

2.An RNA primer

3.An Okazaki fragment

4.DNA ligase

Question 15 of 15

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