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
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.
What is the term used for a protein molecule that assists in the proper folding of other proteins?
1. ubiquitin
2. chaperonin
3. vimentins
4. cyclins
Locomotion is a very important feature in animals. Considering the frequent need for locomotion in animals, an animal would obtain the greatest benefit from storing its energy as:
1. proteins
2. minerals
3. carbohydrates
4. fats
In an average composition of a cell, the maximum % of total cellular mass [after water and protein] is constituted by:
1. Carbohydrates
2. Lipid
3. Nucleic acids
4. Ions