WorksheetsMedical Biochemistry Past Test Paper
Total questions: 17
Worksheet time: 26mins
The peptide bond in proteins is
Planar, but rotates to three preferred dihedral angles
Non planar, but rotates to three preferred dihedral angles
Non-planar, and fixed in a trans conformation
Planar, and usually found in a trans conformation
Control of urea cycle involves the enzyme
Carbamoyl phosphate synthetase
Ornithine transcarbamoylase
Arginino-succinase
Arginase
At neutral pH a mixture of amino acids in solution would be predominantly
Dipolar
Nonpolar molecules
Positive and monovalent
Hydrophobic
Which of the following forces is the most favourable for protein folding?
Conformational entropy
Hydrophobic interactions
Van Der Waals interactions
Hydrogen bonds
Calculate the pH of a mixture of 0.3M acetic acid and 0.2M sodium acetate. The pKa of acetic acid is 4.76
5.1
4.1
6.1
4.9
An allosteric activator
Increases the binding affinity
Decreases the binding affinity
Increases the Km number
Binds the enzyme at the active site
A compound serving a link between citric acid cycle and urea cycle is
Malate
Succinate
Fumarate
Citrate
Nonessential amino acids
Are not components of tissue proteins
May be synthesised in the body from essential amino acids
Have no role in the metabolism
May be synthesised in the body even in diseased states
Fatty acids can be transported into and out of the cell plasma membrane by
Active transport
Diffusion
Facilitated transport
Osmosis
The two amino acids having R groups with a negative net charge at pH 7.4 are
Aspartate and glutamate
Arginine and histidine
Cysteine and methionine
Proline and Valine
Describe transport of molecules across cell plasma membrane with examples where possible.
Briefly explain the international classification of enzymes
Determine the pH of a solution prepared by dissolving 0.45mole of Chloride in 1.0L of 0.35M aqueous ammonia. Kb for ammonia equals 1.77 * 10-5
Write briefly about the structure and function of starch and glycogen
Write about structure of cell plasma membrane
Classify proteins based on composition giving examples for each.
Describe the Urea cycle, clearly stating the enzymes involved at each step
