19) Which of the following is a monomer used to build a biological polymer? B) a

Question

19) Which of the following is a monomer used to build a biological polymer? B) amino acid C) DNA D) triglyceride 20) 20) Which of the following is true of cellulose? A) It is a polymer composed of enantiomers of glucose B) It is a polymer of glacose joined by a glycosidic linkages C) It is a primary structural component of plant cell walls. D) It is digestible by bacteria in the human gut 21) 21) A molecule with the chemical formula CH120% is probably a A) monosaccharide C) hydrocarbon. B) lipid D) glycerol. 22) Which of the following statements regarding lipids is true? 22) A) They are made from glycerol and amino acids B) They generally contain nitrogen C) They are insoluble in waber. 23) 23) Which of the following large biological molecules will sell-assemble into a bilayer when mixed with water? A) cellulose B) phospholipids C) proteins 24) Which bonds maintain the primary structure of a protein? 24) A) hydrogen bonds C) ionic bonds B) disalide bonds D) peptide bonds 25) Interactions between the side chains (R groups) in a polypeptide are most important in stabilizing 25) which of the following A) secondary structure C) quatermary structure B) tertiary structure D) primary structure 26) One of the primary functions of RNA molecules is to 26)- A) make a copy of itself, thus ensuring genetic continuity. B) transmit genetic information to offspring C) function in the synthesis of proteins D) act as a pattern or blueprint to form DNA. 27) A nucleotide is composed of 27 A) a nitrogenous base and a pentose sugar B) a nitrogenous base, a phosphate group, a pentose sugar, and an amino acid C) a nitrogenous base and a phosphate group D) a nitrogenous base, a phosphate group, and a pentose sugar 28) Which of the following are pyrimidines? 28)- A) cytosine and guanine C) cytosine and uracil B) adenine and guanine D) adenine and thymine 29) Which of the following are purines? 29) A) cytosine and guanine C) guanine and adenine B) thymine and uracil D) adenine and thymine

Explanation / Answer

19. Answer: B) Amino acids,- Amino acids are monomers of polypeptide chain which form proteins

20. Answer: B) it is a polymer of glucose joined by glycosidic linkages - The cellulose is a homopolymer of glucose connected by glycosidic bonds. The bonds formed between to sugar molecules are called glycosidic bonds.

21. Answer: A) Monosaccharide - the formula is for glucose which is a monomer and can be called as monosaccharide

22. Answer:C) they are insoluble in water- lipids are fats and fats are insoluble in water due to hydrophobic nature

23. Answer: B) Phospholipids - Phospholipids have a phosphate polar head (hydrophilic) and a non polar fatty acid tail (hydrophobic). On contact with water the non polar tail moves away from water and polar head are attracted by water, to minimize the exposure of non polar tails the phospholips form two layers in water in which non polar tails are inner side and phosphate head are out side forming bilayer.

24. Answer: D) peptide bonds - peptide bonds are covalent bonds between two amino acids

25. Answer: A) Secondary structure - alpha helix and beta pleaded sheets are secondary structure in proteins maintained by R group of amino acid by sulphide bonds and H-bonds.

26. Answer: C) function in the synthesis of proteins- because RNAs are used in translation of proteins.

27. Answer: D) A nitrogenous base, a phosphate group, and a pentose sugar

28. Answer: C) cytosine and Uracil- are pyrimidines

29. Answer: C) Guanine and Adenine

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