1. Which kinds of structures of proteins are shown in the figures given below
 
 a) A=1° structure, B = 2° structure, C = 3° structure, D = 4° structure
 b) A=4° structure, B = 2° structure, C = 3° structure, D = 1° structure
 c) A=1° structure, B = 4° sstructure, C = 3° structure, D = 2° structure
 d) A=4° structure, B = 3° structure, C = 2° structure, D = 1° structure

2. Lipids are found in acid-insoluble fractions during the analysis of the chemical composition of tissues. Given the reason
 a) It has a very high molecular weight
 b) It is a polymer
 c) It has a low molecular weight
 d) On grinding, the biomembranes are broken into pieces and form insoluble vesicles

3. Choose the element that is negligible in living matter
 a) Si
 b) Mg
 c) Ca
 d) S

4. Name the plant pigments present in the following
I. Carrots
II. Tomatoes
 a) I-Tycopene      II-Carotene
 b) I-Carotene       II-Lycopene
 c) I-Leucopene   II-Carotene
 d) None of the above

5. Which one of the following structural formulae of two organic compounds is correctly identified along with its related function?
 
 a) A- Triglyceride major- Source of energy
 b) B- Uracil- A component of DNA
 c) A-Lecithin- A component of cell membrane
 d) B-Adenine- A nucleotide that makes up nucleic acids

6. Silk consists of
 a) Central core of sericin
 b) Central core of fibroin
 c) Both (a) and (b)
 d) A fine mixture of fibroin and sericin

7. Which statement regarding coenzyme is incorrect?
 a) Every coenzyme is a cofactor and every cofactor is a coenzyme
 b) Every coenzyme is a cofactor but every cofactor is not a coenzyme
 c) Most of the coenzymes are nucleotides and are composed of vitamins
 d) Coenzymes are the active constituents of enzymes

8. The rate of the reaction doubles or decreases by half, for every ___°C change in either direction
 a) 10°
 b) 15°
 c) 20°
 d) 27°

9. Enzymes often have additional parts in their structures that are made up of molecules other than proteins. When this additional chemical part is an organic molecule, it is called
 a) Cofactor
 b) Coenzyme
 c) Substrate
 d) Both (a) and (b)

10. Which one is imino acid?
 a) Pepsin
 b) Proline
 c) Cysteine
 d) Rennin