To which of the following family do folic acid and pantothenic acid belong?
1. Vitamin-C
2. Vitamin-K
3. Vitamin-A
4. Vitamin-B complex
Which one of the following amino acids is an essential part of human diet ?
1. Glycine
2. Phenylalanine
3. Serine
4. Aspartic acid
Which one of the following pairs is not correctly matched?
1. Vitamin B12 - Pernicious anaemia
2. Vitamin-B1 - Beri-beri
3. Vitamin-C - Scurvy
4. Vitamin B2 - Pellagra
About 98% of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and:
(1) Phosphorous and sulphur
(2) Sulphur and magnesium
(3) Magnesium and sodium
(4) Calcium and phosphorous
In non-competitive inhibition:
1. the substrate and inhibitor cannot bind to the enzyme at the same time
2. the inhibitor binds only to the substrate-enzyme complex
3. the inhibitor can bind to the enzyme at the same time as the enzyme's substrate
4. the binding of the inhibitor to the enzyme reduces its activity but does not affect the binding of substrate
Which of the following elements is present in higher proportion [% weight of the total] in Earth's crust with respect to the average composition of a human body?
1. Carbon
2. Nitrogen
3. Sulfur
4. Magnesium
Identify the amino acid with hydroxymethyl as its R group:
1. Glycine
2. Alanine
3. Serine
4. Phenylalanine
All of the following are nucleosides, except:
1. | Adenosine | 2. | Cytosine |
3. | Guanosine | 4. | Uridine |
Identify the incorrect statement regarding the structure of proteins:
1. | They are heteropolymers containing strings of amino acids. |
2. | The first amino acid in the primary structure is the N-terminus amino acid |
3. | Only left helices are observed in proteins |
4. | Tertiary structure is absolutely essential for many biologic functions of the proteins |
At each step of its ascent, the DNA strand turns:
1. 3.4
2. 34
3. 3.6
4. 36