Science Group
Explore subjects and practice MCQs
10
Chapters
1,000
Total MCQs
FBISE Biology
Answer: Molecular biology deals with the structure and function of biomolecules such as carbohydrates, proteins, lipids and nucleic acids.
Answer: Carbohydrates have the general formula Cn(H2O)n, represented by the unit CH2O.
Answer: Monosaccharides are single sugar units and represent the simplest carbohydrates.
Answer: Sucrose forms by the condensation of one molecule each of glucose and fructose.
Answer: Glucose is a reducing sugar and gives a positive Benedict's test, whereas sucrose and starch are non-reducing.
Answer: Glucose is the sugar found in the blood and supplies immediate energy to the body.
Answer: Saturated fatty acids have only single bonds, giving straight chains that pack tightly together.
Answer: Sucrose is a disaccharide made of glucose and fructose joined together.
Answer: Quaternary structure results when multiple polypeptide subunits assemble, as in hemoglobin.
Answer: Fats yield about 9.3 kilocalories per gram, more than twice the energy of carbohydrates or proteins.
Answer: Starch is the principal storage polysaccharide of plants, stored in seeds, roots and tubers.
Answer: Lactose, the sugar of milk, is a disaccharide of glucose and galactose.
Answer: Glycogen, also called animal starch, is stored mainly in the liver and muscles.
Answer: Collagen is a fibrous protein that provides strength to bones, tendons and connective tissues.
Answer: Lipids store energy, insulate and form membranes, but genetic information is carried by nucleic acids.
Answer: Cellulose is a structural polysaccharide that provides rigidity to plant cell walls.
Answer: Every amino acid contains an amino group (-NH2) and a carboxyl group (-COOH).
Answer: Fructose occurs naturally in fruits and is therefore known as fruit sugar.
Answer: Insulin is a protein hormone secreted by the pancreas that controls blood glucose concentration.
Answer: The phosphate head of a phospholipid is water-loving (hydrophilic), while the fatty acid tails are hydrophobic.