BIOL1111 General Biology I Laboratory Assignment 2 The following questions are b
ID: 146424 • Letter: B
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BIOL1111 General Biology I Laboratory Assignment 2 The following questions are based on the 15 molecules ilustrated below. Each molecule may be used once, more than once, or not at al HO-C-H 0% O H OH H HO 0 OH OH 1) Which molecule has both hydrophilic and hydrophobic properties and would be found in plasma membranes? E) 14 B) 5 C)6 D) 12 A) 1 A) 1, 2, and 11 B) 3,7, and 8 C)5,9, and 10 D) 11, 12, and 13 E) 12,14, and 15 A) 1 2) Which of the following combinations could be linked together to form a nucleotide? group? 3) Which of the following molecules contain's) an aldehyde type of E) 1 and B) 4 D) 10 4) Which molecule is glycerol? A)1 B)6 (C)10 D) 14 E) 15 5) Which molecule is a saturated fatty acid? A)1 8)5 C)6 D8 )9Explanation / Answer
1) 5. This molecule has a phosphate group because of which is hydrophilic and fatty acid chains the hydrophobic part of the molecule. The molecule is a type of phosphatidic acid that is found in plasma membrane.
2. D) 11, 12, 13
13 is a purine, which is the nitrogenous base, 12 is phosphate molecule and 11 is a ribose sugar.
3. E) 1 and 4. A carbonyl group is -C=O. An aldehyde is CHO
4. Glycerol is a molecule with 3 carbon, five hydrogens and three hydroxyl groups. 10th molecule is glycerol
5. E) 9 molecule is saturated fatty acid. A saturated fatty acid doesn't have a double bond.
6. A purine is a nine membered ring. Molecule 13 is a purine type molecule
7. A polypeptide is formed of amino acids which have both NH2 and COOH group. Molecules 2,7 and 8 are amino acids and would undergo a dehydration reaction to form a peptide bond to compose a polypeptide chain
8. C) 8 molecule is an amino acid with hydrophobic side chain. This amino acid is glycine
9. As mentioned above two amino acids are joined together in a peptide bond. Among the options given 7 and 8 would join to form a peptide bond.option C is correct
10. One molecule of glycerol which forms the back bone of the molecule and 3 fatty acid chains. The fatty acid chains attach where the hydroxyl groups are present in a dehydration reaction. option B is correct
11. Phosphodiester is formed between a phosphate group and ribose sugar. Option D is correct.
12. Ribose sugar is the pentose sugar found in RNA, Option D is correct.
13. Molecule 15 contains -o- a glycosidic linkage. Option E is correct.
14. A is the correct answer. Molecule 2 is cysteine which forms a disulfide bond, a form of covalent bond to stabilise the tertiary structure of a protein. (-S-S-) this is a disulphide linkage.
15. b) is the correct option. Molecule 5 a phosphatidic acid has a hydrophilic head and hydrophobic tail
16)
A. True. two monosaccharides can be linked to form a disaccharide.
B. True.
C. True. Molecule 2 and 7 are amino acids
D. True
E. False.
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