Biochemistry Practical Assessments
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Questions and Answers

What is the main difference between enantiomers and diastereoisomers?

  • Enantiomers are mirror images, while diastereoisomers are not mirror images. (correct)
  • Enantiomers have different numbers of asymmetric carbons, while diastereoisomers have the same number of asymmetric carbons.
  • Enantiomers have the same spatial configuration, while diastereoisomers have different spatial configurations.
  • Enantiomers have different structural formulas, while diastereoisomers have the same structural formula.

    • Why are D-glucose and D-galactose considered epimers?

  • They differ in the H and OH configuration at carbon 4. (correct)
  • They share the same spatial configuration at all carbons.
  • They are mirror images of each other.
  • They differ in the H and OH configuration at carbon 1.

    • What is the significance of the anomeric carbon in sugars?

  • It changes the entire structural formula of the sugar.
  • It creates a mirror image of the sugar.
  • It is the center of chirality in a ring structure. (correct)
  • It determines the D or L configuration of the sugar.

    • How do enantiomers differ from diastereoisomers in terms of optical activity?

    <p>Only enantiomers exhibit optical activity.</p> Signup and view all the answers

    Which type of isomerism involves isomers that differ in the H and OH configuration at specific carbons?

    <p>Epimers</p> Signup and view all the answers

    Why do D-galactose and D-mannose fall under the category of diastereoisomers?

    <p>Their differences are at more than one carbon atom.</p> Signup and view all the answers

    What is the defining structural feature of carbohydrates?

    <p>The presence of an aldehyde or ketone group along with two or more hydroxyl groups</p> Signup and view all the answers

    What are the four main classifications of carbohydrates based on the number of monomeric units present?

    <p>Monosaccharides, disaccharides, oligosaccharides, and polysaccharides</p> Signup and view all the answers

    Which of the following is a monosaccharide?

    <p>Glucose</p> Signup and view all the answers

    What distinguishes an aldose from a ketose?

    <p>The presence of an aldehyde group or a ketone group, respectively</p> Signup and view all the answers

    Which of the following is an example of a carbohydrate molecule?

    <p>Glyceraldehyde</p> Signup and view all the answers

    What is the primary function of carbohydrates in living organisms?

    <p>Serving as energy sources and storage molecules</p> Signup and view all the answers

    What is the main topic covered in the lecture by Dr. Ngobese from 26 April to 10 May?

    <p>Carbohydrate (CHO) metabolism</p> Signup and view all the answers

    When is the first Theory Assessment scheduled to be conducted?

    <p>28 March</p> Signup and view all the answers

    Which book is recommended for a detailed study of Biochemistry by Christopher Mathews and K.E.Van Holde?

    <p>Biochemistry by Christopher Mathews and K.E.Van Holde</p> Signup and view all the answers

    What is the focus of the lecture by Ms. SR Mokhosi from 5 to 28 March?

    <p>CHO Metabolism</p> Signup and view all the answers

    When is the second Theory Assessment planned to be held?

    <p>9 May</p> Signup and view all the answers

    Which module topic will be covered from 8 to 25 April by Dr. Ngobese?

    <p>Amino acids &amp; proteins</p> Signup and view all the answers

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