3593 + Interview Questions in BIOMOLECULES IN GENERAL AWARENESS Page 49 InterviewSolution

2401.	What is the total number of acidic amino acids found in human proteins?
Answer» Correct Answer - 2

Discussion

2402.	All Proteins are made up of the same amino acids; then how proteins found in human beings and animals may be different from those of other?
Answer» The proteins found in human beings and animals may be different from those of others because the ratio of amino acids present in the protein differs.

Discussion

2403.	Protein are nitrogeneous organic compound having very high molecular mass. They are polyamides formed from `alpha`-amino acid. The bond formed between two amino acid is called peptide bond `-underset(O) underset(\|\|)C-NH-`. The product obtainded by this peptide bond formation are called peptide and they may be divided as di, tri ,tetra, penta peptide. Consider following statements concerning protein 1. All amino acids which are constituents of proteins of `alpha`-amino acid. 2.`alpha`-amino acids are all optically active and have L-configuration 3. An especially favourable conformation for the peptide linkage in protein is the `alpha`-helix arrangement. 4.`alpha`-amino acids are connected by ester linkage. Which of the following statement are correct?A. 1 and 3B. 1 and 2C. 2 and 3D. 2,3 and 4
Answer» Correct Answer - A

Discussion

2404.	Protein are nitrogeneous organic compound having very high molecular mass. They are polyamides formed from `alpha`-amino acid. The bond formed between two amino acid is called peptide bond `-underset(O) underset(\|\|)C-NH-`. The product obtainded by this peptide bond formation are called peptide and they may be divided as di, tri ,tetra, penta peptide. Which statement are correct about peptide bond? 1. `-overset(O)overset(\|\|)C-NH-` group is planar. 2. `C-N` bond length in protein is longer than usual bond length of `C-N` bond. 3. `C-N` bond length in protein is samller than usual bond length of `C-N` bondA. 2 and 3B. 1 and 2C. 2 onlyD. 1 and 3
Answer» Correct Answer - D

Discussion

2405.	Protein are nitrogeneous organic compound having very high molecular mass. They are polyamides formed from `alpha`-amino acid. The bond formed between two amino acid is called peptide bond `-underset(O) underset(\|\|)C-NH-`. The product obtainded by this peptide bond formation are called peptide and they may be divided as di, tri ,tetra, penta peptide. The given structure of amino acid will exist at which pH?
Answer» Correct Answer - A

Discussion

2406.	Describe the quaternary structure of proteins and give example
Answer» Some proteins are an assembly of more than one polypeptide or subunits. The manner in which these individual folded polypeptides or subunits are arranged with respect to each other (e.g. linear string of spheres, spheres arranged one upon the other in the form of a cube or plate) is the architecture of a protein which is referred as the quaternary structure of a protein. Eg: Adult human haemoglobin consists of 4 subunits. Two of these are identical to each other. Hence, two subunits of a -type and two subunits of p -type together constitute the human haemoglobin (Hb).

2406.

Describe the quaternary structure of proteins and give example

Answer»

Some proteins are an assembly of more than one polypeptide or subunits. The manner in which these individual folded polypeptides or subunits are arranged with respect to each other (e.g. linear string of spheres, spheres arranged one upon the other in the form of a cube or plate) is the architecture of a protein which is referred as the quaternary structure of a protein.

Eg: Adult human haemoglobin consists of 4 subunits. Two of these are identical to each other. Hence, two subunits of a -type and two subunits of p -type together constitute the human haemoglobin (Hb).

Discussion

2407.	Describes the primary structure of proteins.
Answer» The sequence of amino acids, i.e. the positional information of the amino acids in a protein is called the primary structure of a protein. A Protein is imagined as a line, the left end represented by the first amino acid and the right end represented by the last amino acid. The first amino acid is also called as N-terminal amino acid and the last amino acid is called the C-terminal amino acid.

Discussion

2408.	which is a disaccharide ?A. GalactoseB. FructoseC. MaltoseD. Dextrin
Answer» Correct Answer - C

Discussion

2409.	Three of the following statements about enzymes are correct and one is wrong. Which one is wrongA. Enzymes require optimun pH for maximal activityB. Enzymes are denatured at high temperature but in certain exceptional organisms they are effective even at temperatures `80^(@)-90^(@)C`C. Enzymes are highly specificD. Most enzymes are proteins but some are lipids
Answer» Correct Answer - D

Discussion

2410.	Which one of the following pairs is wrongly matchedA. Alcohol - NitrogenaseB. Fruit juice - PectinaseC. Textile - AmylaseD. Detergents - Lipase
Answer» Correct Answer - A

Discussion

2411.	the storage protein found in castor oil seeds isA. LeguminB. TuberinC. RichinD. Leucosin
Answer» Correct Answer - C

Discussion

2412.	Which enzyme helps in removing oil stains from clothes Or Which enzyme digests the stored food material of castor seedsA. StreptokinaseB. TrypsinC. LipaseD. Amylase
Answer» Correct Answer - C

Discussion

2413.	Which one of the following pairs is wrongly matchedA. Detergents - lipaseB. Alcohol - nitrogenaseC. Fruit juice - pectinaseD. Textile - amylase
Answer» Correct Answer - B

Discussion

2414.	Allosteric modulation is due to the inhibition action of enzyme byA. Competitive inhibitionB. Substrate concentrationC. Products of reactionD. Enzyme conecentration
Answer» Correct Answer - C

Discussion

2415.	What are inhibitors? Mention its types.
Answer» Certain substances present in the cells may react with the enzyme and lower the rate of reaction. These substances are called inhibitors. It is of two types: 1. Competitive and 2. Non – competitive.

2415.

What are inhibitors? Mention its types.

Answer»

Certain substances present in the cells may react with the enzyme and lower the rate of reaction. These substances are called inhibitors.

It is of two types:

1. Competitive and

2. Non – competitive.

Discussion

2416.	Name any four factors that affect enzyme reactions.
Answer» Four factors that affect enzyme reactions: 1. pH 2. temperature 3. enzyme concentration and 4. substrate concentration.

2416.

Name any four factors that affect enzyme reactions.

Answer»

Four factors that affect enzyme reactions:

1. pH

2. temperature

3. enzyme concentration and

4. substrate concentration.

Discussion

2417.	Name the class of enzymes which split large molecules into smaller ones.
Answer» Correct Answer - Hydrolases.

Discussion

2418.	Some enzymes are named after the reaction, where they are used. What name is given to the class of enzymes which catalyse the oxidation of one substrate with simultaneous reduction of another substrate?
Answer» Oxidoreductase enzymes A class of enzymes which catalyses the oxidation of one substrate with simultaneous reduction of another substrate is known as oxidoreductase enzymes.

Discussion

2419.	The process by which protein synthesis takes place is based on genetic information is calledA. replicationB. massenger hypothesisC. tranlationD. transcription
Answer» Correct Answer - C See proteins

Discussion

2420.	Hydrolysis of proteins in the presence of enzymes produces:A. Hydroxy acidsB. dicarboxylic acidC. amino acidsD. aromatic acid
Answer» Correct Answer - C Proteins are made up of `alpha`-amino acid.

Discussion

2421.	Which one of the following is found in cytoplasm and in ribosomes which contain 60% RNA and 40% protein. (a) Ribosomal RNA (b) Messenger RNA (c) Transfer RNA (d) DNA
Answer» (a) Ribosomal RNA

Discussion

2422.	What is the name of the process of synthesis of mRNA from DNA strand?(a) Transpiration(b) Transcription(c) Transformation(d) Trans esterification
Answer» (b) Transcription

Discussion

2423.	Consider the following statement . (i) Ribosomes are the sites at which protein synthesis takes place. (ii) Messenger RNA carried genetic information from DNA to the ribosomes for protein synthesis. (iii) t RNA consist of 20 – 40 nucleotides in a single chain. Which of the above statement is / are not correct? (a) (i) only (b) (i) & (ii) (c) (iii) only (d) (ii) & (iii)
Answer» (c) (iii) only

Discussion

2424.	Consider the following statement (i) Endocrine glands make hormones.(ii) Hormones may be classified as either protein (or) steroids (iii) Hormones are intracellular signalling molecule. Which of the above statement is / are not correct? (a) (i) only (b) (ii) & (iii) (c) (iii) only (d) (i) & (iii)
Answer» (c) (iii) only

Discussion

2425.	Which one of the following is a steroid?(a) Insulin(b) Epinephrine(c) mutin (d) Estrogen
Answer» (d) Estrogen

Discussion

2426.	Which one of the following is a protein hormone? (a) Insulin (b) Androgen (c) Cortisol (d) Estrogen
Answer» Insulin is a protein hormone.

Discussion

2427.	The nucleic acid base having two possible binding sites is ……… (a) thymine (b) cytosine (c) guanine (d) adenine
Answer» The nucleic acid base having two possible binding sites is guanine

Discussion

2428.	Assertion(A): Enzymes have active sites and substrates, reactive sites on their surfaces respectively.Reason (R): Active and reactive sites push the enzyme and substrate molecules away from each other.(a) Both A and R are correct and R is the correct explanation of A. (b) Both A and R are correct but R is not the correct explanation of A. (c) A is correct but R is wrong. (d) A is wrong but R is correct.
Answer» (a) Both A and R are correct and R is the correct explanation of A.

Discussion

2429.	Which of the following is a reducing sugarA. GalactoseB. Gluconic acidC. SucroseD. `beta`-methyl galactoside
Answer» Correct Answer - A (A) Galactose is a reducing sugar.

Discussion

2430.	Which of the following is not co-enzymeA. NADB. NADPC. FADD. ATP
Answer» Correct Answer - D (d) Co-enzymes are organic molecules which acts as co-factors, but unlike prosthetic goups they do not remain attached to the enzyme between reaction. NAD, NADP and FAD are co-enzymes whereas ATP is an energy carrier in cell.

Discussion

2431.	Which of the following carbohydrates is used in silvering of mirrors?A. GlucoseB. SucroseC. CelluloseD. starch
Answer» Correct Answer - A

Discussion

2432.	The function of glucose is toA. provides energyB. promote growthC. prevent diseasesD. perform all above
Answer» Correct Answer - A

Discussion

2433.	Enzymes which breakdown compounds without using `H_(2) O` are called.A. lyasesB. ligasesC. hydroleasesD. proteases
Answer» Correct Answer - A

Discussion

2434.

Differentiate Apoenzyme from Holoenzyme.

Answer»

Differ Apoenzyme from Holoenzyme:

Apoenzyme	Holoenzyme
1. Active enzyme with its non – protein component	1. Inactive enzyme without its non – protein component

Discussion

2435.	Denautration of proteins changes itsA. strurcture and propertiesB. structure and not propertyC. property but not sturctureD. neither structure not property.
Answer» Correct Answer - A

Discussion

2436.	Natural silk fibre isA. polyesterB. proteinC. lipidsD. polysacchaird
Answer» Correct Answer - B

Discussion

2437.	Explain the chemical nature, structure and role of phospholipids in biological membrane.
Answer» Chemical nature: Phospholipids are amphiphilic in nature. As they have hydrophilic head and hydrophobic tail. Structure: It contains an alcohol, two fatty acid chains and a phosphate group. Role: Phospholipids forms the membranes around the cells and cellular organelles. They form a lipid bilayer membrane. The phospholipids are arranged tail to tail. It serves as a barrier against movement of any ions or polar compounds into and out of the cell.

2437.

Explain the chemical nature, structure and role of phospholipids in biological membrane.

Answer»

Chemical nature:

Phospholipids are amphiphilic in nature. As they have hydrophilic head and hydrophobic tail.

Structure:

It contains an alcohol, two fatty acid chains and a phosphate group.

Role:

Phospholipids forms the membranes around the cells and cellular organelles. They form a lipid bilayer membrane. The phospholipids are arranged tail to tail. It serves as a barrier against movement of any ions or polar compounds into and out of the cell.

Discussion

2438.	Identify X and Y in the given sequence. A. N- terminal amino acid C- terminal amino acidB. N- terminal amino acid N- terminal amino acidC. C- terminal amino acid N- terminal amino acidD. C- terminal amino acid C- terminal amino acid
Answer» Correct Answer - A While representing the primary structure of a protein, the N-terminal amino acid is always written on the first (left) ens of the polypeptide chain and C-terminal amino acid at the right end of the chain.

Discussion

2439.	Phospholipids are important cell membrane constituents because theyA. contain, glycerolB. combine covalently with proteinsC. contain polar and non-polar partsD. can form bilayers in water.
Answer» Correct Answer - C (C) Phospholipids are important cell membrane constituents because they contian with polar and non-polar parts.

Discussion

2440.	Glycoside linkage is.A. an acetal linkageB. an ether linkageC. an ester linkageD. an amide linkage
Answer» Correct Answer - A Glycosidic linkage is an acetal linkage as it connectes two (hemiacetal) monosaccharide units.

Discussion

2441.	Select the option which is not correct with respect to enzyme actionA. Substrate binds with enzyme at its active siteB. Addition of lot of succinate does not reverse the inhibition of succinic dehydrogenase by malonateC. A non-competitive inhibitor binds the enzyme at a site distinct from that which binds the substrateD. Malonate is a competitive inhibitor of succinic dehydrogenase
Answer» Correct Answer - B

Discussion

2442.	Select the option which is not correct with respect to enzyme actionA. Malonate is a competitive inhibtior of succines dehydrogenaseB. Substrate binds with enzyme at its active siteC. Addition of lot of succinate does not regenase by malonateD. A non-competitve inhibitor binds the enzyme at a site distinct form that which binds the substrate.
Answer» Correct Answer - C Inhibition of succine dehydrogen by malonate is an example of competitive inhibition, where malonate occupies the active site of the enzyme and blocks it . However this kind of inhibition is reversible and increase in substrate concentration wil reverse this inhibtion . In non-competitive inhibition the inhibitor binds to the enzyme at a site different form its substrate binding site (i.e., the active site).

Discussion

2443.	Which of the following is a basic amino acid ?A. `H_(2)N-underset(underset(NH)(\|\|))(C)-NH(CH_(2))_(3)-overset(overset(NH_(2))(\|))(CH)-COOH`B. `HOH_(2)C-underset(underset(COOH)(\|))(CH)-NH_(2)`C. `underset(underset(COOH)(\|))(CH_(2))-CH_(2)-overset(overset(NH_(2))(\|))(CH)-COOH`D. `HOOC-CH_(2)- overset(overset(NH_(2))(\|))(CH)-COOH`
Answer» Correct Answer - A Since in `(A)` the number of amino groups is more than that of carboxylic groups. Therefore it is basic.

Discussion

2444.	Which one of the following metal ionss is essential inside the cell for the metabolsim of `glucose//synthesis` of proteins:A. `Na^(+)`B. `K^(+)`C. `Mg^(2+)`D. `Ca^(2+)`
Answer» Correct Answer - C All enzymes that utilize `ATP` in phosphate transfer, require magnesium as a cofactor.

Discussion

2445.	Which of the following `alpha`-amino acids is not optically active?
Answer» Correct Answer - B Glycine `H_(2)N-CH_(2)-COOH` is optically inactive.

Discussion

2446.	The name of the dipeptide `H_(2)underset(underset(CH_(3))(\|))(NC)HCONHCH_(2)COOH`.A. GlycylgylcineB. GlycylalanineC. Glycine alanineD. Alanylglycine
Answer» Correct Answer - D The dipeptide is made of two amino acids they are alanine and glycine hence the name of dipeptide is alanylglycine.

Discussion

2447.	Which of the following `alpha`-amino acids is not optically active?A. AlanineB. GlycineC. PhenylalanineD. Cysteine
Answer» Correct Answer - B Glycine `H_(2)N-CH_(2)-COOH` is optically inactive hence ans.

Discussion

2448.	How many amino acids are used in protein synthesis?A. 15B. 18C. 20D. 91
Answer» Correct Answer - C There are 20 amino acids that are present during the synthesis of protein.

Discussion

2449.	Which of the following amino acids is not optically activeA. lactic acidB. serineC. alanineD. glycine
Answer» Correct Answer - D Glycine is not optically active amino acid due to absence of chiral carbon atom. `H_2N-underset"Glycine"undersetHunderset\|oversetoversetH\|C-COOH`

Discussion

2450.	Which of the following amino acids is not optically activeA. GlycineB. LeucineC. IsoleucineD. Valine
Answer» Correct Answer - A (A) Glycine amino cdi is not optically active.

Discussion

Explore topic-wise InterviewSolutions in .

What is the total number of acidic amino acids found in human proteins?

All Proteins are made up of the same amino acids; then how proteins found in human beings and animals may be different from those of other?

Describe the quaternary structure of proteins and give example

Describes the primary structure of proteins.

which is a disaccharide ?A. GalactoseB. FructoseC. MaltoseD. Dextrin

Which one of the following pairs is wrongly matchedA. Alcohol - NitrogenaseB. Fruit juice - PectinaseC. Textile - AmylaseD. Detergents - Lipase

the storage protein found in castor oil seeds isA. LeguminB. TuberinC. RichinD. Leucosin

Which enzyme helps in removing oil stains from clothes Or Which enzyme digests the stored food material of castor seedsA. StreptokinaseB. TrypsinC. LipaseD. Amylase

Which one of the following pairs is wrongly matchedA. Detergents - lipaseB. Alcohol - nitrogenaseC. Fruit juice - pectinaseD. Textile - amylase

Allosteric modulation is due to the inhibition action of enzyme byA. Competitive inhibitionB. Substrate concentrationC. Products of reactionD. Enzyme conecentration

What are inhibitors? Mention its types.

Name any four factors that affect enzyme reactions.

Name the class of enzymes which split large molecules into smaller ones.

Some enzymes are named after the reaction, where they are used. What name is given to the class of enzymes which catalyse the oxidation of one substrate with simultaneous reduction of another substrate?

The process by which protein synthesis takes place is based on genetic information is calledA. replicationB. massenger hypothesisC. tranlationD. transcription

Hydrolysis of proteins in the presence of enzymes produces:A. Hydroxy acidsB. dicarboxylic acidC. amino acidsD. aromatic acid

Which one of the following is found in cytoplasm and in ribosomes which contain 60% RNA and 40% protein. (a) Ribosomal RNA (b) Messenger RNA (c) Transfer RNA (d) DNA

What is the name of the process of synthesis of mRNA from DNA strand?(a) Transpiration(b) Transcription(c) Transformation(d) Trans esterification

Which one of the following is a steroid?(a) Insulin(b) Epinephrine(c) mutin (d) Estrogen

Which one of the following is a protein hormone? (a) Insulin (b) Androgen (c) Cortisol (d) Estrogen

The nucleic acid base having two possible binding sites is ……… (a) thymine (b) cytosine (c) guanine (d) adenine

Which of the following is a reducing sugarA. GalactoseB. Gluconic acidC. SucroseD. `beta`-methyl galactoside

Which of the following is not co-enzymeA. NADB. NADPC. FADD. ATP

Which of the following carbohydrates is used in silvering of mirrors?A. GlucoseB. SucroseC. CelluloseD. starch

The function of glucose is toA. provides energyB. promote growthC. prevent diseasesD. perform all above

Enzymes which breakdown compounds without using `H_(2) O` are called.A. lyasesB. ligasesC. hydroleasesD. proteases

Differentiate Apoenzyme from Holoenzyme.

Denautration of proteins changes itsA. strurcture and propertiesB. structure and not propertyC. property but not sturctureD. neither structure not property.

Natural silk fibre isA. polyesterB. proteinC. lipidsD. polysacchaird

Explain the chemical nature, structure and role of phospholipids in biological membrane.

Identify X and Y in the given sequence. A. N- terminal amino acid C- terminal amino acidB. N- terminal amino acid N- terminal amino acidC. C- terminal amino acid N- terminal amino acidD. C- terminal amino acid C- terminal amino acid

Phospholipids are important cell membrane constituents because theyA. contain, glycerolB. combine covalently with proteinsC. contain polar and non-polar partsD. can form bilayers in water.

Glycoside linkage is.A. an acetal linkageB. an ether linkageC. an ester linkageD. an amide linkage

Which one of the following metal ionss is essential inside the cell for the metabolsim of `glucose//synthesis` of proteins:A. `Na^(+)`B. `K^(+)`C. `Mg^(2+)`D. `Ca^(2+)`

Which of the following `alpha`-amino acids is not optically active?

The name of the dipeptide `H_(2)underset(underset(CH_(3))(|))(NC)HCONHCH_(2)COOH`.A. GlycylgylcineB. GlycylalanineC. Glycine alanineD. Alanylglycine

Which of the following `alpha`-amino acids is not optically active?A. AlanineB. GlycineC. PhenylalanineD. Cysteine

How many amino acids are used in protein synthesis?A. 15B. 18C. 20D. 91

Which of the following amino acids is not optically activeA. lactic acidB. serineC. alanineD. glycine

Which of the following amino acids is not optically activeA. GlycineB. LeucineC. IsoleucineD. Valine