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

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Question 1 of 15

Biology

1. Semi conservative replication refers to the fact that:

1.Genetic information contained in the transforming molecule

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

3.Certain base pair with specific bases

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

Question 1 of 15

Question 2 of 15

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

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

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

Question 2 of 15

Question 3 of 15

3. Chromosomes are made of:

1.DNA + Pectin

2.DNA only

3.RNA + DNA

4.DNA + Histone

Question 3 of 15

Question 4 of 15

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

1.³²P

2.¹⁸F

3.¹⁴C

4.³⁵S

Question 4 of 15

Question 5 of 15

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

1.An RNA primer

2.DNA ligase

3.A DNA primer

4.An Okazaki fragment

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.Avery

3.Watson and Crick

4.Hershy and Chase

Question 6 of 15

Question 7 of 15

7. Chromosomes are composed of

1.40% protein and 60% DNA

2.70% protein and 30% DNA

3.60% protein and 40% DNA

4.50% protein and 50% DNA

Question 7 of 15

Question 8 of 15

8. 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 polymerase

2.Okazaki fragments

3.DNA ligase

4.Primase

Question 8 of 15

Question 9 of 15

9. Histones have abundance of amino acids

1.Valine and arginine

2.Valine and lysine

3.Arginine and lysine

4.Histidione and threonine

Question 9 of 15

Question 10 of 15

10. In eukaryotic cells, transcription cannot begin until:

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

2.DNA nucleases have isolated the transcription unit

3.Several transcription factors have bound to the promoter

4.The DNA introns are removed from the template

Question 10 of 15

Question 11 of 15

11. 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 11 of 15

Question 12 of 15

12. The anticodon of a particular tRNA molecule is:

1.Complementary to the corresponding triplet in rRNA

2.Catalytic, making the tRNA

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

4.Complementary to the corresponding triplet in mRNA

Question 12 of 15

Question 13 of 15

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

1.Progresses away from the replication fork

2.Produces Okazaki fragments

3.Depends on the action of NDA polymerase

4.Occurs in the 3’ – 5’ direction

Question 13 of 15

Question 14 of 15

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

1.140 million

2.160 million

3.150 million

4.240 million

Question 14 of 15

Question 15 of 15

15. A sub metacentric chromosome has centromere:

1.Slightly away from the center of a chromosome

2.In the center of chromosome

3.Near an end of chromosome

4.At the end of a chromosome

Question 15 of 15

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