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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 3551. |
The disease albinism is caused by the deficiency of |
| Answer» Correct Answer - Tyrosinase | |
| 3552. |
Which of the following is a vitamin?A. testosteroneB. maltoseC. riboflavinD. keratin. |
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Answer» Correct Answer - C Riboflavin is vitamin `B_(2)` |
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| 3553. |
Vitamin `B_(6)` is known asA. pyridoxineB. thiamineC. tocopherolD. riboflavin. |
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Answer» Correct Answer - A Vitamin `B_(6)` is also known as pyridoxine. |
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| 3554. |
The process by which protein synthesis takes place is based on genetic information calledA. replicationB. messenger hypothesisC. translationD. transcription |
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Answer» Correct Answer - C It is called translation. |
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| 3555. |
The acid showing salt-like character in aqueous solution isA. Acetic acidB. citric acidC. prolineD. fumaric acid |
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Answer» Correct Answer - C |
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| 3556. |
The acid showing salt-like character in aqueous solution isA. acetic acidB. benzoic acidC. formic acidD. `alpha`-amino acetic acid. |
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Answer» Correct Answer - D `alpha`-amino acids show salt like (Zwitter ion ) structure. |
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| 3557. |
Which of the following is an example of Zwitter ion?A. ureaB. glycine hydrochlorideC. ammonium acetateD. L-alanine |
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Answer» Correct Answer - D L-Alanine is an `alpha`-amino acid. |
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| 3558. |
Vitamin `D` is called :A. ascorbic acidB. thiamineC. ergocalciferolD. riboflavin. |
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Answer» Correct Answer - C Vitamin D is also called ergocalciferol |
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| 3559. |
Vitamin `B_(12)` containsA. Fe(II)B. Co(III)C. Zn(II)D. Ca(II) |
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Answer» Correct Answer - B See vitamins |
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| 3560. |
How are enzymes named these days ? |
| Answer» Enzymes are now-a-days named by adding ase to the root word of the substrate. | |
| 3561. |
What are enzyme inhibitors ? |
| Answer» Chemicals that limit action of enzymes. | |
| 3562. |
Chemicals that stop or slow down the function of an enzyme are called inhibitors. Is it correct ? |
| Answer» Correct Answer - Yes. | |
| 3563. |
What are Allosteric inhibitors? |
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Answer» Compounds which modify enzyme activity by causing a reversible change in the structure of the enzyme active site. This in turn affects the ability of the substrate to bind to the enzyme. Such compounds are called allosteric inhibitors, e.g. The enzyme hexokinase which catalysis glucose to glucose – 6 phosphate in glycolysis is inhibited by glucose – 6 phosphate. This is an example for feedback allosteric inhibitor. |
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| 3564. |
Explain in brief about End – product inhibitor. (Negative Feedback Inhibition) |
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Answer» When the end product of a metabolic pathway begins to accumulate, it may act as an allosteric inhibitor of the enzyme controlling the first step of the pathway. Thus the product starts to switch off its own production as it builds up. The process is self – regulatory. As the product is used up, its production is switched on once again. This is called end – product inhibition. |
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| 3565. |
An example of feedback inhibition is …………… . (a) Cyanide action on cytochrome (b) Sulpha drug on folic acid synthesiser bacteria (c) Allosteric inhibition of hexokinase by glucose – 6 – phosphate (d) The inhibition of succinic dehydrogenase by malonate |
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Answer» (c) Allosteric inhibition of hexokinase by glucose – 6 – phosphate |
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| 3566. |
A sequence of how many nucleotides in messenger `RNA` makes a codon for amono acid ?A. 3B. 4C. 1D. 2 |
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Answer» Correct Answer - A The four bases in `m-RNA`, `i.e.,` adenine, cytosin, guanine and uracil have been shown to act in the form of triplet. Each triple behaves as a code for the synthesis of a particular amino acid. |
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| 3567. |
The anticondon transfer RNA for the messenger RNA codon G-C-A isA. T-G-AB. G-U-TC. A-G-TD. C-G-U |
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Answer» Correct Answer - B The bases of messenger RNA are complementary to those of the DNA strand. Oppsoite each adenine (A) of DNA, there appears on RNA a uracil (U), opposite guanine (G) is Cytosine (C) , opposite cytosine (C) is guanine (G) and opposite Thymine (T) is Adenine (A) . thus, the anticondone of G-C-A would be C-G-U. |
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| 3568. |
The transfer RNA molecule in 3D appearsA. L-shapedB. E-shapedC. Y-shapedD. S-shaped |
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Answer» Correct Answer - A Kim et al, (1973) suggested L shaped model of tRNA by X-ray diffraction while studying phenyl alanine tRNA of yeast. L shape structure of tRNA is a 3-dimentional (3D) structure of 20 `Å` thickness |
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| 3569. |
Conjugated proteins containing carbohydrates as prosthetic group are known asA. chromoproteinsB. glycoproteinsC. lipoproteinsD. nucleoproteins |
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Answer» Correct Answer - B Glycoproteins (mucoproteins) are conjugated protein having a simple or complex sugar (galactose) residue at then N-terminal end. Glycoprotein is found in egg white, mucin, antibody IgG, cell membrane, saliva, synovial fluid, heparin. Lipoproteins contain lipids and nucleoproteins contain nucleic acid as the prosthetic group. |
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| 3570. |
Refer to the given reactin. `{:(C_(12)H_(22)O_(11)+H_(2)O overset(Enzyme A)to 2C_(6)H_(12)O_(6)),("Maltose"" ""Glucose"):}` Enzyme A used in the reaction, belongs to which class of enzymes ?A. DehydrogenasesB. TransferasesC. HydrolasesD. Lyases |
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Answer» Correct Answer - C As per the Enzyme Nomenclature Recommendations (1978) of IUBMB, enzyme have been divided into six major groups as - Oxidoreductases, Transferase, Hydrolases, Lyases, Isomerases and Ligases (synthetases). Enzyme A used in the given reaction belongs to class Hydrolases. Hydrolases catalyse hydrolsis of bonds like ester, pepetide, glycosidic, C-C, C-halide, P-N, etc., which are formed by dehydration/condensation reactions. Hydrolases break up large molecules into smaller ones with the help of hydrogen and hydrozyl groups of water molecules. The phenomenon is called hydrolysis. Digestive enzyme belonging to this group are amylase (hydrolysis of strach), sucrase, lactase, etc. `underset("Maltose")(C_(12)H_(22)O_(11))+H_(2)O overset("Maltase")rarrunderset("Glucose")(2C_(6)H_(12)O_(6))` |
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| 3571. |
The 3-dimensional view of a protein is provided byA. Primary structureB. Secondary structureC. Tertiary structureD. Quaternary structure |
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Answer» Correct Answer - C (C) The 3-dimentional view of a protein is provided by tertiary structure. |
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| 3572. |
Read the lgiven statements and select the correct option . Statement 1 : Ribozymes are RNA molecules which catalyse the synthesis of certain specific RNAs and removal of introns from mRNA. Statement 2 : Ribozymes are proteinaceous enzymes.A. Both statements 1 and 2 are correct.B. Statement 1 is correct but statement 2 is incorrect.C. Statement 1 is incorrect but statement 2 is correct.D. Both statements 1 and 2 are incorrect. |
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Answer» Correct Answer - B Ribozymes are a group of ribonucleic acids that function as biological catalysts and are regarded as non-protein enzymes. |
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| 3573. |
Enzymes that catalyse removal of groups from substrates by mechanisms other than hydrolysis, and addition of groups to double bonds, are calledA. ligasesB. lyasesC. hydrolasesD. dehydrogenases. |
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Answer» Correct Answer - B Lyases enzyme catalyse the breakage of specific covalent bonds and removal of groups without hydrolysis producing double bonds or removal of double bonds by adding groups, e.g., histidine decarboxylase that splits C-C bond of histidine, forming `CO_(2)` and histamine. `overset(X)overset(|)(C)-overset(X)overset(|)(C)overset("lyase")rarr X-Y+C=C` |
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| 3574. |
Enzyme that catalyse endergoinc synthesis coupled with exergonic hydrolysis of ATP areA. LigasesB. LyasesC. HydrolasesD. Oxidoreductase |
| Answer» Correct Answer - A | |
| 3575. |
Algae have cell wall made up of ………(a) Cellulose, galactans and mannans (b) Cellulose, chitin and glucan (c) Cellulose, Mannan and peptidoglycan |
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Answer» (a) Cellulose, galactans and mannans |
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| 3576. |
The percentage of water in the total cellular mass is ……(a) 50% (b) 60% (c) 70% (d) 80% |
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Answer» The percentage of water in the total cellular mass is 70%. |
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| 3577. |
Fatty acids which do not contain double bond between carbon atoms are (A) saturated fatty acids (B) unsaturated fatty acids (C) oleic and linoleic acids (D) linoleic and linolenic acids |
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Answer» The correct answer is (A) saturated fatty acids |
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| 3578. |
At some points a protein molecule may be folded back on itself. This called _____ structure and folds or coils are held together in place by _______.A. `2^(@)`, H-bondsB. `2^(@)`, peptide bondsC. `3^(@)`, H-bondsD. `1^(@)`, peptide bonds |
| Answer» Correct Answer - A | |
| 3579. |
If a native protein is subjected to physical or chemical treatment which may disrupt, its higher structure without affecting prirnary structure then this process is calledA. Inversion of proteinB. Denaturation of proteinC. Renaturation of proteinD. Fermentation |
| Answer» Correct Answer - B | |
| 3580. |
Protein found in a biological system with a unique three-dimensional structure and biological activity is called a native protein. When a protein in its native form, is subjected to a physical change like change in temperature or a chemical change like, change in pH, denaturation of protein takes place. Explain the cause. |
| Answer» Due to physical and chemical change, hydrogen bonds in proteins are disturbed. Due is this globules unfold and helix gets uncoiled and therefore, protein loses its biological activity. This is known as denaturation of proteins. | |
| 3581. |
What is the native state of protein? |
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Answer» The energetically most stable shape of the protein at normal pH and temperature is called native state. |
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| 3582. |
Where does the water present in the egg go after boiling the egg? |
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Answer» On boiling during denaturation process water gets adsorbed/absorbed in the denatured proteins. |
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| 3583. |
When RNA is hydrolysed, there is no relationship among the quantities of different bases obtained. What does this fact suggest about the structure of RNA? |
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Answer» The structure of DNA is completly different from RNA .In case of DNA which has a double staranded structure the bases are paired adenine pairs with thymine wherees cytosine pairs with guanine.due to such definte structure DNA molecule is hydrolysed in definite molar ratio whereas there is no such structure in case of RNA .Here different bases are formed in different molar ratio.This suggests that the structure of RNA is single stranded. |
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| 3584. |
Assertion `:` Vitamin `C` cannot stored in our body. Reason `:` Vitamin `C` is a water soluble vitamin.A. If both the assertion and reason are true and the reason is the correct explanation of the assertionB. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true. |
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Answer» Correct Answer - A Both statements are correct and Reason is correct explanation of asserion. |
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| 3585. |
When RNA is hydrolysed, there is no relationship among the quantities of different bases obtained. What does this fact suggest about the structure of RNA? |
| Answer» A DNA molecule has two strands in which the four complementary bases pair each other, i.e., cytosine (C) always pair with guanine (G) while thymine (T) always pairs with adenine (A). Thus, when a DNA molecule is hydrolysed, the molar amounts of cytosine is always equal to that of guanine and that of adenine is always equal to that of guanine and that of adenine is always equal to thymine. In RNA, there is no relationship between the quantities of four bases (C, G, A and U) obtained, therefore, the base pairing principle, i.e., A paris with U and C pairs with G is not followed. Therefore, unlike DNA, RNA has a single strand. | |
| 3586. |
Why cannot vitamin `C` be stored in our body ? |
| Answer» Vitamin C cannot be stored in the body because it is water soluble and is, therefore, easily excreted in urine. | |
| 3587. |
What products would be formed when a nucleotide from DNA containing thymine is hydrolysed? |
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Answer» When a nucleotide from the DNA containing thymine is hydrolyzed, thymine β-D-2- deoxyribose and phosphoric acid are obtained as products. |
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| 3588. |
A phosphoglyceride is always made up ofA. a saturated or unsatuarated or unsaturated fatty acid estrified to a glycerol molecule to which a phosphorus group is also attachedB. a saturated or unsaturated fatty acid esterified to a phosphate group which is also attached to a glycerol is also attachedC. only a saturated fatty acid esterified to glycerol moleucle to which a phosphate group is also attachedD. only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached |
| Answer» Correct Answer - A | |
| 3589. |
If the molecular mass of an amino acid is 150 daltoms, the molecular mass of a tripeptide will beA. 450B. 486C. 504D. 414 |
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Answer» Correct Answer - D Tripeptide is formed by the condensation of 3 amino acids with lose of `2H_(2)O` molecules. The molecular mass of 2 water molecules is `18 xx 2 = 36`. Therefore , tripeptide mass will be `(150 xx 3) - 32 = 414` |
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| 3590. |
The number of amino acids required to form a tripeptide bond areA. SevenB. TwoC. SixD. Four |
| Answer» Correct Answer - D | |
| 3591. |
Can you attempt building models of biomolecules using commercially available atomic models (Ball and Stick models). |
| Answer» Correct Answer - Yes | |
| 3592. |
Attempt titrating an amino acid against a weak base and discover the number of dissociating (ionizable) functional groups in the amino acid. |
| Answer» Titrating a neutral or basic amino acid against a weak base will dissociate only one functional group, whereas titration between acidic amino acid and a weak acid will dissociate two or more functional groups. | |
| 3593. |
On controlled hydrolysis and condensation, `R_(3)SiCl` yieldsA. `R_(3)Si-O-SiR_(3)`B. C. `R_(3)SiOH` |
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Answer» Correct Answer - A `R_(3)SiCl` on hydrolysis forms only a dimer. `R_(3)SiOH+HOSiR_(3) rarr R_(3)Si-o-SiR_(3)` |
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