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

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Question 1 of 15

Biology

1. Chromosomes are made of:

1.DNA + Histone

2.DNA only

3.DNA + Pectin

4.RNA + DNA

Question 1 of 15

Question 2 of 15

2. Chromosomes are composed of

1.70% protein and 30% DNA

2.40% protein and 60% DNA

3.60% protein and 40% DNA

4.50% protein and 50% DNA

Question 2 of 15

Question 3 of 15

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

1.140 million

2.240 million

3.150 million

4.160 million

Question 3 of 15

Question 4 of 15

4. Histones have abundance of amino acids

1.Arginine and lysine

2.Valine and arginine

3.Histidione and threonine

4.Valine and lysine

Question 4 of 15

Question 5 of 15

5. Semi conservative replication refers to the fact that:

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

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

3.Genetic information contained in the transforming molecule

4.Certain base pair with specific bases

Question 5 of 15

Question 6 of 15

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

1.Bacteriophage injected DNA into bacteria

2.The polysaccharide coat of bacteria caused pneumonia

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

4.Heat-killed pathogenic cell caused pneumonia

Question 6 of 15

Question 7 of 15

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

4.Several transcription factors have bound to the promoter

Question 7 of 15

Question 8 of 15

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

1.Occurs in the 3’ – 5’ direction

2.Depends on the action of NDA polymerase

3.Progresses away from the replication fork

4.Produces Okazaki fragments

Question 8 of 15

Question 9 of 15

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

Question 9 of 15

Question 10 of 15

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

1.DNA ligase

2.An RNA primer

3.An Okazaki fragment

4.A DNA primer

Question 10 of 15

Question 11 of 15

11. A sub metacentric chromosome has centromere:

1.Near an end of chromosome

2.At the end of a chromosome

3.In the center of chromosome

4.Slightly away from the center of a chromosome

Question 11 of 15

Question 12 of 15

12. The anticodon of a particular tRNA molecule is:

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

2.Complementary to the corresponding triplet in mRNA

3.Complementary to the corresponding triplet in rRNA

4.Catalytic, making the tRNA

Question 12 of 15

Question 13 of 15

13. 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.Okazaki fragments

4.Primase

Question 13 of 15

Question 14 of 15

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

1.³⁵S

2.¹⁸F

3.¹⁴C

4.³²P

Question 14 of 15

Question 15 of 15

15. 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.Watson and Crick

2.Hershy and Chase

3.Avery

4.Beadle and Tatum

Question 15 of 15

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