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

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Question 1 of 15

Biology

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

1.The polysaccharide coat of bacteria caused pneumonia

2.Bacteriophage injected DNA into bacteria

3.Heat-killed pathogenic cell caused pneumonia

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

Question 1 of 15

Question 2 of 15

2. Histones have abundance of amino acids

1.Valine and lysine

2.Valine and arginine

3.Arginine and lysine

4.Histidione and threonine

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. In eukaryotic cells, transcription cannot begin until:

1.DNA nucleases have isolated the transcription unit

2.Several transcription factors have bound to the promoter

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

4.The DNA introns are removed from the template

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 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 5 of 15

Question 6 of 15

6. 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.DNA ligase

3.Primase

4.Okazaki fragments

Question 6 of 15

Question 7 of 15

7. Chromosomes are made of:

1.DNA + Histone

2.DNA + Pectin

3.RNA + DNA

4.DNA only

Question 7 of 15

Question 8 of 15

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

1.DNA ligase

2.An RNA primer

3.A DNA primer

4.An Okazaki fragment

Question 8 of 15

Question 9 of 15

9. 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 9 of 15

Question 10 of 15

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

1.³²P

2.¹⁴C

3.¹⁸F

4.³⁵S

Question 10 of 15

Question 11 of 15

11. Chromosomes are composed of

1.50% protein and 50% DNA

2.70% protein and 30% DNA

3.40% protein and 60% DNA

4.60% protein and 40% DNA

Question 11 of 15

Question 12 of 15

12. A sub metacentric chromosome has centromere:

1.At the end of a chromosome

2.In the center of chromosome

3.Slightly away from the center of a chromosome

4.Near an end of chromosome

Question 12 of 15

Question 13 of 15

13. The anticodon of a particular tRNA molecule is:

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

2.Catalytic, making the tRNA

3.Complementary to the corresponding triplet in rRNA

4.Complementary to the corresponding triplet in mRNA

Question 13 of 15

Question 14 of 15

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

1.Progresses away from the replication fork

2.Occurs in the 3’ – 5’ direction

3.Depends on the action of NDA polymerase

4.Produces Okazaki fragments

Question 14 of 15

Question 15 of 15

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

1.150 million

2.140 million

3.160 million

4.240 million

Question 15 of 15

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