Punjab 12th Class Biology Chapter 20 Chromosome and DNA Mcqs Test Online
Questions 15
Total Marks 30
Time 15 Mins
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Punjab 12th Class Biology Chapter 20 Chromosome and DNA Mcqs Test Online

Start your preparation for Punjab 12th Class Biology Chapter 20 Chromosome and DNA Mcqs Test Online. This online test contains 15 MCQs and you have 15 Minutes to complete it. The total marks for this test are 30. This test is valid for students of All Punjab Boards (Lahore, Gujranwala, Multan, etc.) following the PCTB Syllabus. Read the questions carefully and select the correct option below to see your result.

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

 

Question 1 of 15

Biology

1. Synthesis of a new DNA strand usually begins with:
1.
2.
3.
4.

Question 1 of 15

Question 2 of 15

2. Histones have abundance of amino acids
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2.
3.
4.

Question 2 of 15

Question 3 of 15

3. A sub metacentric chromosome has centromere:
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3.
4.

Question 3 of 15

Question 4 of 15

4. Semi conservative replication refers to the fact that:
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2.
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4.

Question 4 of 15

Question 5 of 15

5. In his work with peneumonia-causing bacteria and mice, Griffith found that:
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2.
3.
4.

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.
2.
3.
4.

Question 6 of 15

Question 7 of 15

7. What is the basis for the difference in how the leading and lagging strands of DNA molecules are synthesized?
1.
2.
3.
4.

Question 7 of 15

Question 8 of 15

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

1.
2.
3.
4.

Question 8 of 15

Question 9 of 15

9. Chromosomes are made of:
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2.
3.
4.

Question 9 of 15

Question 10 of 15

10. A typical human chromosome contains __________ nucleotides in its DNA
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2.
3.
4.

Question 10 of 15

Question 11 of 15

11. Chromosomes are composed of
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2.
3.
4.

Question 11 of 15

Question 12 of 15

12. 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.
2.
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4.

Question 12 of 15

Question 13 of 15

13. The anticodon of a particular tRNA molecule is:
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4.

Question 13 of 15

Question 14 of 15

14. In eukaryotic cells, transcription cannot begin until:
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3.
4.

Question 14 of 15

Question 15 of 15

15. The elongation of the leading strand during DNA synthesis:
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2.
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4.

Question 15 of 15


 

Guide for Punjab Board Students

Students of BISE Lahore, Gujranwala, Multan, and other Punjab boards must follow the SLO based pattern.

Top Scoring Tips for Punjab:

  • Textbook Reading: The paper is 100% derived from PCTB books. Do not rely only on keybooks.
  • Objective Paper (20%): Practice these online MCQs repeatedly as they are taken from 5-Year Past Papers.
  • Bubble Sheet: Ensure you know how to fill the OMR sheet correctly.

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