DELHI SCHOOL TEACHERS FORUM

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CLASS -12 BIOLOGY TEST -5 - MCQ - Topics : How was DNA identified, Finding structure of DNA, Central Dogma and DNA packaging based on the class held on 26/08/2020.

NAME OF STUDENT & Roll No. *

SELECT SCHOOL *

NAME OF TEACHER *

1. Which of the following Scientist obtained image of DNA using X-ray crystallography ? *

1 point

Friedrich Miescher

Rosalind Franklin

Richard Altmann

Erwin Chargaff

2. From the following, select which was not the conclusion obtained from of Crystallography analysis of DNA ? *

1 point

DNA forms a helix

Twists every 34 angstrom

10 basis per twist

DNA is single stranded

Phosphates are on the outside.

3. What is the ratio of Purine and Pyrimidine in DNA as given by Erwin Chargaff. *

1 point

1:1

1:2

2:1

1;3

4. If a double stranded DNA has 20% Thymine, the percentage of Guanine in the DNA *

1 point

10%

30%

90%

80%

5. Which of the following Scientist proposed the double helix structure of DNA *

1 point

Rosalind Franklin

Chargaff

James Watson and Franscis Crick

Richard Altmann

6. Histones are rich in : *

1 point

Lysine and arginine

Alanine and glycine

Cysteine and tyrosine

Histidine and serine

7. Central Dogma of protein synthesis is *

1 point

RNA → DNA → Protein

DNA → Protein → RNA

RNA → Protein → DNA

DNA → RNA → Protein

8. Enzyme responsible for reverse transcription is : *

1 point

DNA polymerase

RNA polymerase

Reverse transcriptase

None of the above

9. If a DNA contains 1000 base pairs, what would be its length? *

1 point

3400 A

34000 A

6800 A

1000 A

10. In a nucleotide, the nitrogen base is joined to the sugar molecule by *

1 point

Phosphodiester bond

Gycosidic bond

Hydrogen bond

both 'a' and 'b'

11. What is not True for DNA in prokaryotes *

1 point

present in the form of a compact structure called nucleoid

the coils are maintained by non-histone basic proteins

found in cytoplasm in a supercoiled condition

packaged as nucleosomes along with histones

12. Nucleosome is made up of_____> *

1 point

DNA, histone core protein

RNA, histone core protein

RNA, histone core protein, linker H1

DNA, histone core protein, linker H1

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