Give below is a diagrammatic representation which indicates the secondary structure of DNA 

Choose the correct option for the structures labelled as A, B, C and D

    A                                 B                               C                            D

1. Guanine                    Cytosine                    Adenine                 Thymine

2. Guanine                     Thymine                   Adenine                  Cytosine

3. Thymine                   Adenine                     Guanine                 Cytosine

4. Thymine                   Guanine                    Adenine                  Cytosine    

Backbone of DNA is formed by :-

1. Sugar $-$ Phosphate $-$ Sugar

2. Nitrogen base $-$ Phosphate $-$ Sugar

3. Phosphate $-$ Nitrogen base $-$ Sugar

4. Base pairs

Nucleic acids exhibit

1. Secondary structure

2. Tertiary structure

3. Quaternary structure

4. Both (2) & (3)

Both the strands of the DNA are joined by

(1)Disulphide bond

(2)hydrogen bonds

(3)Glycosidic bonds

(4)phosphodiester bonds

Select the correct statement 

1. The base pairs in DNA are stacked 0.34 nm apart
2. The diameter of a right handed helical ds B-DNA molecules is 34 $\stackrel{\mathrm{o}}{\mathrm{A}}$

3. Sugar-phosphate and hydrogen bonds are both present in a single nucleotide such as AMP

4. A and T of one strand compulsorily base pair with G and C respectively, of other strand is DNA

 If the sequence of bases in one of the DNA strand is is A G G A G A A, then the sequence of bases in the other complementary strand of DNA would be

1. C C T T C T T

2. T C T C T C C

3. T C C T C T T

4. C C T C T C T

In B-DNA, one full turn of the helical strand contains

1. 11 base pairs

2. 8 base pairs

3. 10 base pairs

4. 9 base pairs

In which of the following energy is released?

1. Conversion of glucose into pyruvate

2. Formation of proteins from amino acids

3. Conversion of glucose into lactic acid

4.Both (1) & (3)