Post mock exam Flashcards
Structure and function of Cholesterol?
A steroid, a lipid consisting of four fused carbon rings. Functions include imparting flexibility to the cell membrane by maintaining the desired fluidity of the phosphoid bilayer. Cholesterol is a precursor molecule to Vit D, sex hormones and other matter.
Structure and function of Maltose?
A disaccharide sugar that is composed of two glucose molecules connected together with a glycosidic bond as the result of a condensation reaction.
C6H12O6 + C6H1206 = C12H22O11 + H20
Product of starch digestion formed using the protein enzyme amalyse and is hydrolysed with the enzyme maltase in the small intestine to create glucose.
Structure and function of Starch?
Polysaccharide composed of glucose monomers joined in glycosidic 1,4 bonds. Insoluble in water (good storage depot of glucose). Moderately branched (compared to Glycogen).
Source of nutrition to humans, stored in roots. Hydrolysed by amalyase secreted by salivary glands, to produce disaccharide malotse, further hydrolysed by matlase in small intestines to produce glucose to make ATP during cellular respiration.
Structure and function of cellulose?
Beta glucose monomers joined together in glycosydic bonds. Unbranched, long chained polysaccharide / polymere.
Long chains help form the tough protective wall around plant cells. It plays a role in structure and strength of plants.
What is Primary Structure?
The precise linear sequence of amino acids in a polypeptide chain encoded by DNA, bonded together. Though only 20 amino acids, the type and order they’re bonded determines their primary structure and their folding, ultimate shape and properties.
What is Quarternary Structure?
The three-dimensional structure of two or more polypeptide chains, the simplest being a dimmer but can be 100 chains. Haemoglobin has four chains (2 alpha and 2 beta) which aid in transporting respiratory gas (O2) in the circulatory system to respiring cells for cellular respiration.
