Double Helix DNA Structure

Question 1

Double helix Structure was given by

Answer 1

Watson and Crick

Question 2

The double helix structure was based on a study of

Answer 2

1. (Franklin and Wilkins ) => X-ray diffraction of DNA =>Crystallography of DNA => Observed DNA in the form of Helix

Question 3

DNA shows ————periodicity

Answer 3

3.4 Angstrom

Question 4

Width of ONE DNA ()

Answer 4

20 Angstrom

Question 5

Length of One Gene ()

Answer 5

3.4 Angstrom

Question 6

3.4 A is how many nm

Answer 6

0.34 nm

Question 7

Distance between two successive base pairs in DNA is

Answer 7

0.34 nm/ 3.4 A

Question 8

Chargaff Rule

Answer 8

the molar concentration of Purine should be equal to Pyrimidine..

Question 9

CHARGAFF RULE

Answer 9

[A+G/C+T]

Question 10

[A+G/C+T] , this base ratio is —————– in different organisms

Answer 10

DIFFERENT

Question 11

DNA is ———————-Stranded

Answer 11

DOUBLE

Question 12

DNA backbone is made up of

Answer 12

S-P-S (Sugar Phosphate Sugar), Nitrogenous Bases Projected Inwards

Question 13

Nitrogenous bases are projected

Answer 13

INWARDS

Question 14

DNA shows —————-Base pairs

Answer 14

Complementary (A will always bond with T and G with C)

Question 15

DNA is always —————-handed helix

Answer 15

Right handed

Question 16

Both strands are ——–to each other

Answer 16

Anti Parallel

Question 17

Stability of DNA is provided by

Answer 17

Hydrogen Bond (Plane of Base pairs is stacked over each other)

Question 18

DNA is ————-in nature

Answer 18

ACIDIC

Question 19

DNA is —————- charged

Answer 19

Negatively charged

Question 20

Number of base pairs in human dna

Answer 20

6.6 * 10 power 9

Question 21

DNA is wrapped around ————————

Answer 21

Histone core

Question 22

histone core

Answer 22

Histone Octomer Core

Question 23

DNA wrapped around histone octamer core is called

Answer 23

Nucleosome

Question 24

Histone is ———-core

Answer 24

Octomar

Question 25

Octomar means

Answer 25

made from one protein

Question 26

Octomar core

Answer 26

has 2 molecules of H2A, H2B, H3 and H4

Question 27

1 Nucleosome has -----------bp long DNA

Answer 27

200 Bp

Question 28

The procedure of DNA Coiling

Answer 28

First Coiling(DNA Thread) => Then DNA is circled around histone (Called Nucleosome) => then the DNA is made like a telephone cord (Called Solenoid/Chromatin Fibre) 30 nm => more coiling (called super coiled=> then DNA looks diploid =>then on division it forms chromosomes

Question 29

2 molecules of H2A, H2B, H3H4 are genes or not

Answer 29

No, they arent genes of octomar protein. they are just the units of octomer protein

Question 30

What is the C-value of DNA

Answer 30

Total AMount of DNA