Unit 1 Chapter 2 (1st Secondary) Biology

88 Questions | Total Attempts: 23

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Unit 1 Chapter 2 (1st Secondary) Biology

. Proteins and Nucleic acids


Questions and Answers
  • 1. 
    A nucleotide of DNA may contain ________.
    • A. 

      Ribose, uracil, and a phosphate group

    • B. 

      Deoxyribose, uracil, and a phosphate group

    • C. 

      Deoxyribose, thymine, and a phosphate group

    • D. 

      Ribose, thymine, and a phosphate group

  • 2. 
    In double helix of DNA, the two DNA strands are .....
    • A. 

      Coiled around a common axis

    • B. 

      Coiled around each other

    • C. 

      Coiled differently

    • D. 

      Coiled over a cellulosic sheath.

  • 3. 
    A segment of DNA has 120 adenine and 120 cytosine bases. The total number of nucleotides present in the segment is .....
    • A. 

      120

    • B. 

      240

    • C. 

      360

    • D. 

      480

  • 4. 
    All of the following are true for protein denaturation except that it ……
    • A. 

      Is a shape change

    • B. 

      Is always irreversible

    • C. 

      May be caused by a pH change

    • D. 

      Could result from a temperature change

  • 5. 
    In the formation of a macromolecule, what type of bond would join two amino acid subunits?
    • A. 

      Ionic bond

    • B. 

      Bond between two carbon atoms

    • C. 

      Hydrogen bond

    • D. 

      Peptide bond

  • 6. 
    Assuming they all had the same number of carbon atoms, which of the following has the most C-H bonds?
    • A. 

      Unsaturated fat

    • B. 

      Dipeptide

    • C. 

      Disaccharide

    • D. 

      Saturated fat

  • 7. 
    Dehydration and hydrolysis reactions involve removing or adding ______ to macromolecule subunits.
    • A. 

      C and O

    • B. 

      C and H

    • C. 

      COOH and H

    • D. 

      OH and H

  • 8. 
    What type of macromolecule carries out catalysis in biological systems?
    • A. 

      Proteins called enzymes

    • B. 

      Carbohydrates called starches

    • C. 

      Lipids called steroids

    • D. 

      Nucleic acids called DNA

  • 9. 
    Polymerization reactions in which polysaccharides are synthesized from monosaccharides or proteins are synthesized from amino acids. These reactions …... 
    • A. 

      Are hydrolysis reactions.

    • B. 

      Result in the formation of water.

    • C. 

      Release energy.

    • D. 

      All of the above.

  • 10. 
    Which element occurs in nucleic acids?
    • A. 

      Manganese

    • B. 

      Calcium

    • C. 

      Phosphorus

    • D. 

      Sulfur

  • 11. 
    Nucleotides have a nitrogenous base attached to a sugar at the …...
    • A. 

      1' carbon

    • B. 

      2' carbon

    • C. 

      3' carbon

    • D. 

      5' carbon

  • 12. 
    Which of the following is correct with respect to the amino acid composition of proteins?
    • A. 

      At least one of the 20 different amino acids is common in all proteins.

    • B. 

      Proteins with different functions usually differ significantly in their amino acid composition.

    • C. 

      Proteins with the same molecular weight have the same amino acid composition.

    • D. 

      The average molecular weight of an amino acid in a protein increases with the size of the protein.

  • 13. 
    Which part of the amino acid gives it uniqueness?
    • A. 

      Amino group

    • B. 

      Carboxyl group

    • C. 

      Alkyl group

    • D. 

      Peptide bond

  • 14. 
    One of the following statements is not true for a dipeptide molecule ......
    • A. 

      Two alkyl (R) groups

    • B. 

      Two amino acids and one peptide bond.

    • C. 

      Two free carboxylic groups and two free amino groups.

    • D. 

      Amino acids are linked by a C-N bond.

  • 15. 
    Protein molecules are mostly made up of ………
    • A. 

      Carbon, hydrogen, oxygen and nitrogen

    • B. 

      Carbon, hydrogen, carbon monoxide and nitrogen

    • C. 

      Carbon, hydrogen, oxygen and methane

    • D. 

      Carbon, hydrogen, oxygen and sulpher

  • 16. 
    Each protein molecule is made up of …..
    • A. 

      Carbohydrates

    • B. 

      Fatty acids

    • C. 

      Amino acids

    • D. 

      Nucleotides

  • 17. 
    There are about ……. amino acids in all which, can be linked together in different ways to make numerous protein molecules.
    • A. 

      40

    • B. 

      20

    • C. 

      25

    • D. 

      30

  • 18. 
    The protein molecules inside the body are used for …....
    • A. 

      Making new cells

    • B. 

      Fighting microbes

    • C. 

      Lowering heat of activation of the biochemical reactions

    • D. 

      All of the above

  • 19. 
    The DNA …….
    • A. 

      Store information for controlling all cellular activities.

    • B. 

      Synthesizes fats.

    • C. 

      Produces energy.

    • D. 

      All of the above.

  • 20. 
    The DNA consists of two …….. coiled strands.
    • A. 

      Spherically

    • B. 

      Spirally

    • C. 

      Angularly

    • D. 

      Cubically

  • 21. 
    A nucleotide has ……….
    • A. 

      Nitrogenous base + phosphoric acid + sugar

    • B. 

      Two sugar molecules + phosphoric acid

    • C. 

      Three phosphoric acid molecules

    • D. 

      Two phosphoric acid + nitrogenous base

  • 22. 
    In a DNA molecule, adenine binds with thymine by a …..
    • A. 

      Single bond

    • B. 

      Double bond

    • C. 

      Triple bond

    • D. 

      Ionic bond

  • 23. 
    In a DNA molecule, cytosine binds with guanine by a ……
    • A. 

      Single bond

    • B. 

      Double bond

    • C. 

      Triple bond

    • D. 

      Ionic bond

  • 24. 
    Which of the following contain nitrogen and sulphur?
    • A. 

      Nucleic acids

    • B. 

      Carbohydrates

    • C. 

      Lipids

    • D. 

      Proteins

  • 25. 
    Which of the following can be used as short-term energy storage?
    • A. 

      Carbohydrates

    • B. 

      Triglycerides

    • C. 

      ATP 

    • D. 

      Proteins

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