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.Near an end of chromosome

2.At the end of a chromosome

3.Slightly away from the center of a chromosome

4.In the center of chromosome

Question 1 of 15

Question 2 of 15

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

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

2.The polysaccharide coat of bacteria caused pneumonia

3.Bacteriophage injected DNA into bacteria

4.Heat-killed pathogenic cell caused pneumonia

Question 2 of 15

Question 3 of 15

3. 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.Primase

3.DNA polymerase

4.Okazaki fragments

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?

1.³⁵S

2.¹⁴C

3.³²P

4.¹⁸F

Question 4 of 15

Question 5 of 15

5. 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 5 of 15

Question 6 of 15

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

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

Question 6 of 15

Question 7 of 15

7. Chromosomes are composed of

1.40% protein and 60% DNA

2.50% protein and 50% 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 lysine

3.Valine and arginine

4.Arginine and lysine

Question 8 of 15

Question 9 of 15

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

1.160 million

2.140 million

3.150 million

4.240 million

Question 9 of 15

Question 10 of 15

10. Chromosomes are made of:

1.DNA only

2.DNA + Pectin

3.DNA + Histone

4.RNA + DNA

Question 10 of 15

Question 11 of 15

11. 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.Hershy and Chase

3.Beadle and Tatum

4.Watson and Crick

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.Complementary to the corresponding triplet in mRNA

3.Catalytic, making the tRNA

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

Question 12 of 15

Question 13 of 15

13. 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 13 of 15

Question 14 of 15

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

1.Occurs in the 3’ – 5’ direction

2.Progresses away from the replication fork

3.Depends on the action of NDA polymerase

4.Produces Okazaki fragments

Question 14 of 15

Question 15 of 15

15. Semi conservative replication refers to the fact that:

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

2.Certain base pair with specific bases

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

4.Genetic information contained in the transforming molecule

Question 15 of 15

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