General
✓✗Which of the following vitamins is synthesised in the human body (in the skin) in the presence of sunlight?
- Vitamin B1
- Vitamin D
- Vitamin E
- Vitamin C
General
✓✗Glucose is classified as an
- aldotetrose
- ketohexose
- aldohexose
- aldopentose
General
✓✗Which one regulates the rate of energy-producing (metabolic) reactions in the body?
- Progesterone
- Oestrogen
- Thyroxine
- Adrenaline
General
✓✗Pyridoxine is vitamin
- C
- B2
- B6
- B1
General
✓✗Which of the following hormones contains iodine?
- Adrenaline
- Testosterone
- Thyroxine
- Insulin
General
✓✗Amylose constitutes about what percentage of starch?
- 100%
- 80−85%
- 15−20%
- 50%
General
✓✗D-Glucose and L-glucose are
- enantiomers
- epimers
- identical
- anomers
General
✓✗Which of the following is a reducing disaccharide that gives only glucose on hydrolysis?
- Sucrose
- Maltose
- Cellulose
- Lactose
General
✓✗The bases present in RNA are
- adenine, thymine, cytosine and uracil
- adenine, guanine, cytosine and thymine
- only pyrimidines
- adenine, guanine, cytosine and uracil
General
✓✗Which of the following statements about enzymes is true?
- Enzymes lack nucleophilic groups
- Pepsin is a proteolytic enzyme
- Enzymes catalyse chemical reactions by increasing the activation energy
- Enzymes are non-specific and act equally on all substrates
General
✓✗Water-soluble vitamins (except B12) must be supplied regularly in the diet because they
- are made in the body
- are stored in fat
- are insoluble in water
- are excreted in urine
General
✓✗Cellulose is the main constituent of
- hair
- plant cell walls
- blood
- animal muscles
General
✓✗Glucose dissolved in water shows mutarotation. This is because
- glucose is oxidised
- glucose hydrolyses
- glucose changes into sucrose
- the α and β forms interconvert until equilibrium
General
✓✗Which of the following is correct for the DNA double helix?
- The two strands run antiparallel and are held by hydrogen bonds between complementary bases
- The two strands are identical
- The strands are joined by covalent bonds between bases
- The bases are on the outside
General
✓✗Which of the following statements is NOT correct?
- Ovalbumin is a simple food reserve in egg-white
- Insulin maintains the sugar level in the blood of a human body
- Denaturation makes the proteins more active
- Blood proteins thrombin and fibrinogen are involved in blood clotting