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Biomolecules Test - 30

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Biomolecules Test - 30
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  • Question 1
    1 / -0
    Which one of the following is widely distributed in a cell?
    Solution
    RNA is present inside nucleus and also in the cytoplasm. A eukaryotic cell has three types of RNA mRNA, tRNA, and rRNA. These RNA molecules are synthesized inside nucleus but are subsequently translocated to the cytoplasm where they take part in the process of protein synthesis. 
    So, the correct answer is option B.
  • Question 2
    1 / -0
    Which of the following statements is/are not true?
    (A) Glycerol is a 3 carbon alcohol with 3 OH groups that serve as binding sites
    (B) Waxes are esters formed between long-chain alcohol and saturated fatty acids
    (C) The term protein was coined by Gerardus Johannes Mulder
    (D) Agar is an indispensable polysaccharide and it is a complex polymer of glucose and sulphur-containing carbohydrates
    Solution
    Glycerol is trihydroxy alcohol having three hydroxyl groups attached to three different carbon atoms. In waxes, both the alcohol and fatty acids are long-chained molecules and fatty acids are saturated. Gerardus Johannes Mulder described the nature of proteins. Agar is derived from red algae Gelidium and Gracilaria.  In chemical terms, agar is a polymer made up of subunits of the sugar galactose. It does not contain sulphur.

    So the correct answer is option E
  • Question 3
    1 / -0
    .......... contain high content of lysine.
    Solution
    Lysine is an essential amino acid required for human nutrition. Since this cannot be produced by the body, it becomes neccessary to include it in the human diet either through produces which have a high lysine content or should be taken in as supplements. Though mostly found in  meats, fish, and poultry products, other foods that have lysine are cheese, beans, brewer's yeast, mung bean sprouts and some fruits and vegetables such as legumes and soya. Food grains with their low protein content are low sources of lysine. however, seitan, quinoa and amaranth have a high content of lysine.
  • Question 4
    1 / -0
    Anabolism is
    Solution
    The anabolic processes are the reactions in which the smaller organic molecules are used for the production of the large complex molecules. The process is an endergonic process in which the energy is supplied which is required for the formation of the new bonds in the larger complexes. The energy is required when the small amino acids are attached for the formation of peptide bonds in proteins. 
    Thus, the correct answer is option A. 
  • Question 5
    1 / -0
    A mathematical explanation of enzyme action on substrate was formulated by ____________.
    Solution
    In a mathematical description of enzyme action developed by Leonor Michaelis and Maud Menten in 1913, two constants play an important role. This point is reached when there are enough substrate molecules to completely fill (saturate) the enzyme's active sites.
    So E is the correct option. 
  • Question 6
    1 / -0
    Example of glycoprotein is
    Solution
    Casein and haemoglobin are proteins. Lecithin is a lipid phosphatidylcholine. Mucins are a family of high molecular weight, heavily glycosylated proteins (glycoconjugates) produced by epithelial tissues in most organisms of Kingdom Animalia.
  • Question 7
    1 / -0
    Who got the Nobel prize by working on enzymes in the year 1978?
    Solution
    W. Arber and D. Nathans were awarded the nobel prize in the year 1978 for discovering the restriction enzymes. Restriction enzymes are enzymes which can restrict or cut exogenous or foreign DNA molecule. These are a type of endonucleases.
    So, the correct answer is option A.
  • Question 8
    1 / -0
    The type of linkage present in carbohydrates is
    Solution
    • A peptide bond joins two amino acids together to form polypeptides.
    • Glycosidic bonds are the covalent bonds that link the two monosaccharides molecules in a carbohydrate.
    • A glycosidic bond is the result of a condensation reaction, which means that one water molecule is produced during the formation of a glycosidic bond.
    • Peptide bonds are also known as amide bonds.
    • High energy phosphate bonds are present in ATP, not carbohydrates.

    So the correct answer is option B.


  • Question 9
    1 / -0
    The wavelength of ultraviolet light absorbed by nucleic acid is
    Solution
    The range of absorption of nucleic acid is  240 to 275 nm. It shows maximum absorption at 260 nm. The bases can be protonated, and therefore the spectra of DNA and RNA are sensitive to pH. 
    So, the correct answer is option C.
  • Question 10
    1 / -0
    Formation of both peptide and glycosidic bonds involves ?
    Solution
    Peptide bonds are formed between amino acids by linking them into long chains called proteins. Glycosidic bonds are formed between simple monosaccharides and join them to make large polysaccharides. Both peptide and glycosidic bonds are formed as a result of dehydration reactions. So water is removed while the formation of bond takes place.
    So, the correct answer is option B.
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