Biology 12 Imp Questions chapter 20 from past papers

Biology 12 Imp Questions chapter 20 from past papers of Punjab boards. These important biology 12 mcqs, short and long questions are collected by going through different past papers of all Punjab Board Pakistan.

Why are these questions important?

These Questions are taken from past papers of Biology Class 12. These questions are top repeated of in previous papers of Biology 12 of all Punjab boards as;

      Bahawalpur Board

      D.G.Khan Board

      Faisalabad Board

      Gujranwala Board

      Lahore Board

      Multan Board

      Rawalpindi Board

Content is created and designed with intense care and diligence. Here is only the most important MCQ, short questions and long questions of Biology 12 chapter 20 chromosomes and DNA.

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You can easily download in pdf format or view Biology 12 chapter mcqs, short questions and long questions  online. You can easily print these files in simple way. Here you find Biology 12 chapter 20 chromosomes and DNA important mcqs, short and long questions. By Preparing these important questions, you will achieve splendid marks in Biology 12. This content is very helpful for weak students and also helpful for those students that are better at Biology 12 exam preparation. These Questions are based on the current Biology 12 syllabus according to Punjab Textbook Board.

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Generally, students get less time for preparation. If we talk about Biology 12, we need a lot of intensive time to prepare for it. 2nd Year students of face big difficulty while preparation of Biology MCQs, Short & Long questions. Good News! mhbeducator.com offers you, the easiest and smartest way to prepare Biology Class 12 by which students can save their time and will able to prepare Class 12 Biology very fast. Here your are provided Biology 12 chapter 20 chromosomes and DNA MCQs, important short and long questions. For other chapters click the link below the Post. These Questions are based on the current Biology 12 syllabus according to Punjab Textbook Board.

About This Chapter

chapter 20 chromosomes and DNA of  Biology 12 introduces the students to genetics and role of chromosomes and composition of chromosomes. Students learn about The Chromosomal Theory of Inheritance. Students learn DNA as Hereditary Material and chemical nature of DNA. Students learn about genes and proteins synthesis using RNA. Students learn about genetic code. At the last of this chapter students learn translation and Mutations.  This Post "Biology 12 Imp Questions chapter 20 from past papers" covers all important mcqs, short and long questions related to important  topics of this chapter.

👉Imp MCQs - Biology Class 12 CH # 20

1. In sickle cell anemia a point mutation  leads to change of amino acid , Glutamic acid into :

(A) Proline

(B) Leucine

(C) Valine

(D) None of these

(C) Valine

2. How many nucleotides are in DNA  of typical human chromosome ? 

(A) 100

(B) 120

(C) 140

(D) 160

(C) 140

3. The 5-Carbon sugar in DNA is   

(A) Deoxyribose

(B) Ribose

(C) Lactose

(D) Glucose

(A) Deoxyribose

4. Number of nucleotides in okazaki fragments are about
    

(A) 100 - 200

(B) 100 - 150

(C) 200 - 400

(D) 250 - 350

(A) 100 - 200

5. Human cells contain different types of tRNA :

(A) 25

(B) 35

(C) 15

(D) 45

(D) 45

6. Which of the following are V shaped chromosomes?

(A) Telocentric

(B) Metacentric

(C) Acrocentric

(D) Submetacentric

(B) Metacentric

7. The number of chromosomes in chimpanzee are :

(A) 46

(B) 48

(C) 36

(D) 14

(B) 48

8. Adenine and guanine pair up to form 

(A) Peptide bond

(B) Purines

(C) Pyrimidines

(D) None of these

(B) Purines

9. Chromosomes consists of DNA and protein about 

(A) 50%-50%

(B) 20%-80%

(C) 40%-60%

(D) 30%-70%

(C) 40%-60%

10. Copying information from mRNA to DNA is :

(A) Replication

(B) Transcription

(C) Translation

(D) Transformation

(B) Transcription

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👉Other Chapters (PDF) of Biology Class 12 Punjab Textbook Board

✅Chapter 15

Homeostasis

✅Chapter 16

Support and Movement

✅Chapter 17

Coordination and Control

✅Chapter 18

Reproduction

✅Chapter 19

Growth and Development

✅Chapter 21

Cell Cycle

✅Chapter 22

Variation and Genetics

✅Chapter 23

Biotechnology

✅Chapter 24

Evolution

✅Chapter 25

Ecosystem

✅Chapter 26

Some Major Ecosystems

✅Chapter 27

Man and his Environment