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

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Question 1 of 15

Biology

1. A sub metacentric chromosome has centromere:

1.In the center of chromosome

2.Slightly away from the center of a chromosome

3.At the end of a chromosome

4.Near an end of chromosome

Question 1 of 15

Question 2 of 15

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

1.A DNA primer

2.DNA ligase

3.An Okazaki fragment

4.An RNA primer

Question 2 of 15

Question 3 of 15

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

1.Heat-killed pathogenic cell caused pneumonia

2.The polysaccharide coat of bacteria caused pneumonia

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

4.Bacteriophage injected DNA into bacteria

Question 3 of 15

Question 4 of 15

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

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

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

Question 4 of 15

Question 5 of 15

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

1.150 million

2.160 million

3.240 million

4.140 million

Question 5 of 15

Question 6 of 15

6. Chromosomes are composed of

1.40% protein and 60% DNA

2.70% protein and 30% DNA

3.50% protein and 50% DNA

4.60% protein and 40% DNA

Question 6 of 15

Question 7 of 15

7. 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.Hershy and Chase

2.Beadle and Tatum

3.Watson and Crick

4.Avery

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.Produces Okazaki fragments

3.Occurs in the 3’ – 5’ direction

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 arginine

3.Histidione and threonine

4.Valine and lysine

Question 9 of 15

Question 10 of 15

10. Chromosomes are made of:

1.RNA + DNA

2.DNA only

3.DNA + Histone

4.DNA + Pectin

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 mRNA

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

4.Complementary to the corresponding triplet in rRNA

Question 11 of 15

Question 12 of 15

12. Semi conservative replication refers to the fact that:

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

2.Certain base pair with specific bases

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

4.Genetic information contained in the transforming molecule

Question 12 of 15

Question 13 of 15

13. 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 13 of 15

Question 14 of 15

14. 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.Primase

4.DNA polymerase

Question 14 of 15

Question 15 of 15

15. In eukaryotic cells, transcription cannot begin until:

1.DNA nucleases have isolated the transcription unit

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

3.The DNA introns are removed from the template

4.Several transcription factors have bound to the promoter

Question 15 of 15

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