Identify the following reaction Lactose H2o-Glucose Galactowe A) ionic reaction
ID: 141454 • Letter: I
Question
Identify the following reaction Lactose H2o-Glucose Galactowe A) ionic reaction B) dehydration synthesis reaction C) hydrolysis reaction D) exchange reaction E) reversible reaction 18) 18) Which type of molecule contains-NH2 groups? C) nucleic acid A) triglycerides 1B) protein TRUEFALSE. Write T if the statement is true and 'Fif the statement is false. 19) Covalent bonds are always shared equally MULTIPLE CHOICE Choose the one alternative that best completes the statement or answers the question. 20) Starch, dextran, glycogen, and cellulose are polymers of 20) A) acids B) amino acids C) glucose D) nucleic acids. E) fatty acids. Figure 2.3 CH2 H CH2 CH2 NH2 21) What kind of bond is at the arrow in Figure 2.3 21) A) ionic bond B) double covalent bond C) peptide bond D) disulfide bridge E) hydrogen bond 22) Which type of molecule is composed of (CH20) units? A) lipid nucleic acid C) carbohydrate D)proteinExplanation / Answer
17. C) hydrolysis reaction because hydrolysis means breaking of a molecule into smaller molecules with the help of water. lactose is a disaccharide made up of two monosaccharides glucose and galactose. In the reaction lactose is breaking down into glucose and galactose using water so it is a hydrolysis reaction.
18. B) proteins because All proteins are made of amino acids and the basic structure of amino acid has - NH2 group attached to C - alpha on one side and on the other side of C - alpha - COOH group is attached.
19. It's a false statement because there are two types of covalent bonds: polar and non- polar. In non - polar covalent bonds there is equal sharing between two atoms to complete their octet but in polar covalent bonds there is unequal sharing to electronegative difference.The more electronegative atom attracts more electron towards itself than less electronegative atoms resulting in dipole moment. Eg: H2O.
20. C) glucose because all molecules given here is a sugar
derivative or ribose sugar derivative made of monomeric sugar.
21. Peptide bond between 2 amino acids. The alpha carboxylic group of one amino acid react with alpha amino group of other amino acid. NH2-R1-COOH + H2N-R2-COOH gives NH2-R1-CONH-R2-COOH. Here - OH group of alpha carboxylic group of 1st amino acid and -H group of alpha amino group of 2nd amino acid forms water and is removed resulting in formation of - CONH ( peptide bond).
22. C) carbohydrates (CH2O)n eg glucose ( CH2O)6 gives C×6 H2×6 O×6 i.e C6H12O6. Where n= 6. Other macromolecules have complex formula.