1) Identify the purine base of nucleic acids in the following a) Cytosine b) Thymine c) Uracil d) Adenine 2) Which of the following are not the components of RNA? a) Thymine b) Adenine c) Guanine d) Cytosine 3) Which of the following statements is true? a) Sugar component of a nucleotide is ribose b) Sugar component of a nucleotide is deoxyribose c) The bases in nucleotides are attached to a pentose sugar moiety by a glycosidic linkage d) The sugar molecule of the nucleotide is in L-configuration 4) What is the composition of nucleoside? a) a sugar + a phosphate b) a base + a sugar c) a base + a phosphate d) a base + a sugar + phosphate 5) What is the composition of nucleotide? a) a sugar + a phosphate b) a base + a sugar c) a base + a phosphate d) a base + a sugar + phosphate 6) Group of adjacent nucleotides are joined by a) Phosphodiester bond b) Peptide bond c) Ionic bond d) Covalent bond 7) Which of the following is true about phosphodiester linkage? a) 5’-phosphate group of one nucleotide unit is joined to the 3’-hydroxyl group of the next nucleotide b) 3’-phosphate group of one nucleotide unit is joined to the 5’-hydroxyl group of the next nucleotide c) 5’-phosphate group of one nucleotide unit is joined to the 5’-hydroxyl group of the next nucleotide d) 3’-phosphate group of one nucleotide unit is joined to the 3’-hydroxyl group of the next nucleotide 8) Which of the following is false about purine and pyrimidine bases? a) They are hydrophobic and relatively insoluble in water at the near-neutral pH of the cell b) At acidic or alkaline pH the bases become charged and their solubility in water increases c) Purines have two rings in their structure, but pyrimidine bases have only one ring d) At acidic or alkaline pH the bases become charged and their solubility in water decreases 9) Which of the following is not a fat-soluble vitamin? a) Vitamin D b) Vitamin K c) Vitamin C d) Vitamin A 10) Deficiency of which vitamin causes Beri-Beri? a) Vitamin B12 b) Vitamin B2 c) Vitamin B6 d) Vitamin B1 11) Name the disease caused by the deficiency of Niacin? a) Pellagra b) Rickets c) Scurvy d) Pernicious anemia 12) Which of the following is a component of the coenzyme A? a) Retinol b) Pantothenic acid c) Pyridoxine d) Retinoic acid 13) Megaloblastic anemia is caused due to deficiency of a) Cobalamin b) Pyridoxine c) Niacin d) Folic acid 14) Which of the following vitamin is also known as cobalamin? a) Vitamin B11 b) Vitamin B12 c) Vitamin B6 d) Vitamin B2 15) Mark the INCORRECT statement about Ascorbic acid. a) It is a strong reducing agent b) It can be synthesized in the body c) Involves in hydroxylation of prolyl- and lysyl- residues of collagen d) Shows antioxidant activity 16) All fat-soluble vitamin has a coenzyme function. a) True b) False 17) Name the vitamin which functions as hormone as well as visual pigment. a) Thiamine b) Riboflavin c) Retinol d) Folic acid 18) Which of the following vitamin serves as a hormone precursor? a) Vitamin C b) Vitamin A c) Vitamin K d) Vitamin D 19) Chemical messengers secreted by ductless glands are called a) Lymph b) Platelets c) Plasma d) Hormones 20) Endocrine glands secret products into the ducts and transfer it into body cavities. a) True b) False 21) Which of the following is NOT an endocrine gland? a) Hypothalamus b) Pituitary c) Parathyroid d) Pancreas 22) Which of this statement is INCORRECT regarding the function of hormones? a) Reproduction and sexual differentiation b) Maintenance of internal environment c) Maintain body temperature d) Development and growth 23) Mark the one, which is NOT the precursor of the hormone? a) Amino acids b) Cholesterol c) Phospholipids d) Proteins 24) What is the precursor of steroid hormone? a) Protein b) Cholesterol c) Carbohydrate d) Lipid 25) Name the hormone which is synthesized from histidine amino acid. a) Histamine b) Epinephrine c) Norepinephrine d) Dopamine

BBT2044 Tutorial 3

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