Mdcat-past-papers Quiz

2221. The structure of fibrous protein comprises a polypeptide chain in the form of:

Clusters
Flat uncoiled chains
Spherical
Long strands or fibrils

2222. In glycine R is _.

Fatty acid
Ethane
Hydrogen
Methane

2223. Sequence of amino acids in a polypeptide chain of Protein molecules corresponds to the sequence of nucleotides on mRNA for a human protein is 993 nucleotide including a stop codon at the end. How many amino acids would be incorporated in the polypeptide chain?

331
993
393
330

2224. All enzymes are-

Fibrous proteins
Low molecular weight proteins
Lipoproteins
Globular Proteins

2225. Unique three-dimensional shape of the fully folded polypeptide, constitutes:

primary structure of protein
secondary structure of protein
tertiary structure of protein
Quaternary structure of protein

2226. Proteins are the main ------- of the cell?

Physiological components
Functional components
Structural components
Biological components

2227. forms almost three- fourth of the body by weight:

Water
Carbohydrates
Proteins
Lipids

2228. Lysozyme represents which structural level of proteins?

Primary structure
Secondary structure
Tertiary Structure
Quaternary Structure

2229. A disulphide bridge is found in which biomolecule?

Enzyme
Protein
Carbohydrate
Lipid

2230. Select an example of fibrous protein:

Enzymes
Collagen
Hemoglobin
Hormones

2231. Which function is not performed by proteins?

Providing structural support to cell
catalyzing biochemical reactions
transporting materials across cell membran
providing insulation against heat loss

2232. Select the protein providing support for the connective tissue:

Histones
Keratin
Elastin
Collagen

2233. Fibrous proteins "Do NOT" take part in:

Blood clotting
formation of nails
muscle contraction
oxygen transport

2234. Two amino acids form a dipeptide through:

Condensation reaction
Ionic bond formation
Hydrolysis
Hydrogen bonding

2235. Number of amino acids in each alpha chain of hemoglobin is:

141
146
414
416

2236. A haemoglobin molecule consists of -------amino acids:

874
474
574
574

2237. Haemoglobin is a:

Carbohydrate
Protein
Nucleic acid
Enzyme

2238. Proteins are macromolecules formed of units known as amino acids. The amino acids which the variable group R is represented by an H atom is:

Lysine
Phenylalanine
Glycine
Alanine

2239. Enzymes are -------:

Carbohydrates
Proteins
Lipids
Can be lipids or proteins

2240. Sickle cell anaemia results from?

Reduction in oxygen carrying capacity of haemoglobin
Linkage between the polypeptide chains
Single amino acid substitution in the haemoglobin molecule
Viral infection of RNA viruses