D) carbohydrates 21. There are 20 different amino acids and they have different
ID: 143957 • Letter: D
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D) carbohydrates 21. There are 20 different amino acids and they have different properties as a result of.. A) the carboxyl group C) the amino groups E) the alpha carbon B) the side chains (also known as R groups) D) the amino groups that are attached to the alpha carbon 22. Which of the following is broken when water evaporates? A) nonpolar covalent bondsa B) ionic bondsa C) hydrogen bonds D) polar covalent bonds 23. Which of the following bases is not associated with RNA? C) Uracil (U) B) Guanine (G) E) Adenine (A) A) Cytosine (C) D) Thymine (T) 24. The structural carbohydrate found in plant cells is C) chitin B) starch E) pentose sugars A) cellulose D) gycogen 25. A ribose sugar has Carbons A) 3 C) 5 26. What is a triglyceride? A) a protein with tertiany structure B) a lipid made of three fatty acids and one glycerol C) a lipid that is a major part of the plasma membrane D) a molecule formed from three alcohols and one fatty acid E) a carbohydrate with three sugars joined together by glycosidic linkages 27. The primary difference between a saturated fat and an unsaturated fat is A) an unsaturated fat has double bonds between some carbons, making it liquid at room temperature. 8) a saturated fat has double bonds between some carbons, making it solid at room temperature. C) an unsaturated fat has double bonds between some carbons, making it solid at room temperature. D) an unsaturated fat has single bonds between all carbons, making it liquid at room temperature. E) a saturated fat has single bonds between all carbons, making it liquid at room temperature The secondary level of protein structure is interactions between the rotein structure is interactions between the lypeptide backbone; R groups oups, polypeptide backbone and the tertiaryExplanation / Answer
21. All the amino acids have at least one carboxylic group and an amino group. 20 different amino acid posses different properties due to the presence of different R groups or the side chains. Hence the correct answer is option B.
22. Hydrogen bond can be broken when water evaporates. During phase change of water from liquid to vapour large amount of enegy is absorbed which breaks the hydrogen bond. Hence the correct answer is option C.
23. Thymine is not associated with RNA. It is found only in DNA. Hence the correct answer is option D.
24. Cellulose is a form of carbohydrate that is found in the cell wall of the plant cell. So it is a structural carbohydrate. In plants, food is stored in form of starch which is also a carbohydrate, but a storage carbohydrate. Similarly in animals, food is stored only in form of glycogen which is also a storage carbohydrate. Chitin is also found in cell wall of fungi. Pentose sugar is a structural component of nucleotides. Hence the correct answer is option A.
25. Ribose sugar has 5 carbons. Its molecular formula is C5H10O5. Hence the correct answer option C.
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