Biological Molecules 2 (MJC)

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frozespot171
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134832
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Biological Molecules 2 (MJC)
Updated:
2012-02-14 20:20:49
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MJC Biological molecules
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Proteins and Nucleic acids
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  1. What is the level of protein structure is seen in the diagram above?
    1) Primary structure
    2) Secondary structure
    3) Tertiary structure
    3) Tertiary structure

  2. Identify the level of protein structure seen above.
    1) Quaternary structure
    2) Secondary structure
    3) Tertiary structure
    4) Primary structure
    1) Quaternary structure
  3. What is NOT a reason why cellulose fibers are embedded into an organic matrix?
    1) It transfers stress to the fibers.
    2) It increases the elasticity of cellulose.
    3) It increases the resistance of cellulose to compression.
    2) It increases the elasticity of cellulose.
  4. Which does NOT contribute to the high tensile strength of collagen?
    1) In collagen fibers, tropocollagen lie parallel with staggered ends.
    2) The presence of glycine at every third amino acid within each collagen chain allows for 3 collagen chains to form a tight coil due to its small size.
    3) It is insoluble in water as it lacks polar groups to form hydrogen bonds with water molecules.
    3) It is insoluble in water as it lacks polar groups to form hydrogen bonds with water molecules.
  5. What are the bonds formed between the monomers in glycogen?
    1) α(1,4) glycosidic bonds
    2) α(1,6) glycosidic bonds
    3) Both of the above
    3) Both of the above
  6. Which of the statement below is true?
    1) DNA is single-stranded while RNA is double-stranded.
    2) The bases in DNA are adenine, thymine, guanine and cytosine while the bases in RNA are adenine, thymine, uracil and cytosine.
    3) The phosphate group in both DNA and RNA are bonded to the carbon 5 of the pentose sugar.
    3) The phosphate group in both DNA and RNA are bonded to the carbon 5 of the pentose sugar.
  7. Which of the following is FALSE?
    1) Adenine pairs with Thymine by forming 2 hydrogen bonds.
    2) Guanine pairs with Cytosine through the formation of 2 hydrogen bonds.
    3) The ratio of A:T and C:G is 1:1.
    4) Adenine and guanine are purines while cytosine,thymine and uracl are pyrimidines.
    2) Guanine pairs with Cytosine through the formation of 2 hydrogen bonds.
  8. Which of the following stabilises the DNA double helix?

    1) Hydrogen bonds between the complimentray bases.
    2) Hydrophobic interactions between the stacked bases
    3) Phosphodiester bonds between the nucleotides.
    4) All of the above.
    4) All of the above.
  9. The monomers of amylopectin are :
    1) Beta-glucose
    2) Alpha-glucose
    3) Amino acid
    4) Glycerol
    2) Alpha-glucose
  10. Which statement below explains why fats yield more energy than an equal mass of carbohydrates.
    1) 1 molecule of fat has a larger molecular size compared to 1 molecule of carbohyrates.
    2) Carbohydrates are more compact and takes up less space compared to fats.
    3) Triglycerides have a higher number of C-H and C-C bonds as opposed to an equal mass of carbohydrates.
    3) Triglycerides have a higher number of C-H and C-C bonds as opposed to an equal mass of carbohydrates.

  11. Bond X, which is the __________ between two amino acids, is formed via a ___________ reaction.
    1) Phosphodiester bond, hydrolysis
    2) Ester bond, hydrolysis
    3) Glycosidic bond, condensation
    4) Peptide bond, condensation
    4) Peptide bond, condensation
  12. A sequence of amino acids may end with either an
    amino group or a carboxylic acid group. What is the theoretical number of chemically different dipeptides that may be assembled from 20 different amino acids?

    1) 1
    2) 20
    3) 40
    4) 400
    4) 400
  13. Which of the following below explains why collagen is insoluble in water while haemoglobin is?

    1) Haemogloblin contains 4 prosthetic haem groups while collagen do not.
    2) Haemoglobin has a quaternary structure while collagen does not.
    3) Cross linkages are formed between tropocollagen where as in haemoglobin, intermolecular hydrogen bonds hold the alpha and beta chains together.
    4) Haemoglobin have polar groups while collagen do not.
    4) Haemoglobin have polar groups while collagen do not.
  14. Carbohydrates are one of the four biological molecules present. Which statement about carbohydrates is FALSE?

    1) The bonds formed between monosaccharides are glycosidic bonds.
    2) The general formula of monosaccharides is (CH2O)n.
    3) Pentoses are usually found in DNA but not RNA.
    4) The formation of a glycosidic bond is a condensation reaction.
    3) Pentoses are usually found in DNA but not RNA.
  15. What is a main difference between glycogen and amylopectin?
    1) Reaction to iodine test
    2) Shape/Structure of the carbohydrate
    3) Bonds formed between monomers
    4) Compactness
    4) Compactness

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