At each step of its ascent, the DNA strand turns:

1. 3.4$°$

2. 34$°$

4. 3.6$°$

4. 36$°$

The blood concentration [in mM] of glucose in a normal healthy individual ranges between:

1.  4.5$-$5.0

2.  5.0$-$5.5

3.  5.5$-$6.0

4. All of the above

The substrate has to go through a much higher energy state or transition state in case of:

1. Exothermic reactions only

2. Endothermic reactions only

3. Both exothermic and endothermic reactions

4. Neither exothermic nor endothermic reactions

When the co-factor is removed from the enzyme, the catalytic activity:

1. is lost.

2. is reduced.

3. is increased.

4. is unaffected.

The tail of the phospholipid molecule:

In animal cells, lipid-like steroidal hormones are synthesized in the:

1. Nucleus

2. Rough endoplasmic reticulum

3. Smooth endoplasmic reticulum

4. Golgi apparatus

Lignin is a component of the secondary walls of:-
1. Epidermis
2. Collenchyma
3. Sclerenchyma
4. Parenchyma

Given below is the graph showing the effect of substrate concentration on enzyme activity. In the presence of a competitive inhibitor, when the concentration of the substrate is progressively increased :

Study the primary structure of a part of a hypothetical protein and choose the correct statements:

l. 1 is Serine

ll. 2 is sulfer containing amino acid and can be methionine

lll. 3 is aromatic amino acid and can be tyrosine

lV. 4 is an acidic amino acid

1. l, ll and lll only

2. l, lll and lV only 

3. ll, lll and lV only

4. l, ll, lll and lV