Chapter 19

Glucose cannot be elassified as : (a) an oligosaccharide (b) an aldose (c) a hexose (d) a carbohydrate

The two polypeptide chains present in insulin contain the following number of amino acids: [KCET 1997] (a) 18,12 (b) 20,12 (c) 21,30 (d) 25,16

Which of the following is not present in nucleotide? |KCET 1997] (a) Cytosine (b) Guanine (c) Tyrosine (d) Adenine

A segment of DNA molecule, which codes or specifies for one polypeptide chain is called: [KCEI 1998] (a) adenine (b) phosphate group (c) amino acid (d) gene

The double helical structure of DNA was proposed by : |KCET 1998] (a) Meicher (b) Watson and Crick (c) Khorana (d) - Emil Fischer

Ribose is an example of: (a) aldopentose (b) ketohexose (c) aldohexose (d) disaccharide

Which of the following enzyme is not useful in the digestion of |KCET 1998| protein? (b) Chymotrypsin (a) Pepsin (c) Lipase (d) Trypsin

What is the monomer of polypeptide? (a) Glucose (b) Amino acid (c) Nucleotide (d) Nucleoside

Indigestible carbohydrate which is also a constituent of our diet is? |KCF.T 1999| (a) Cellulose (b) Galactose (c) Maltose (d) Starch

The number of possible different codons is : (a) 16 (b) 64 (c) 32 (d) 48

Amino acids usually exist in the form of Zwitter ions. This means that it consists of \(:\) |KCET 2000\\} (a) the basic group \(-\mathrm{NH}_{2}\) and the acidic group \(-\mathrm{COOH}\) (b) the basic group \(-\mathrm{NH}_{3}^{+}\)and the acidic group \(-\mathrm{CO}_{2}^{-}\) (c) the basic group \(-\mathrm{CO}_{2}^{-}\)and the acidic group \(-\mathrm{NH}_{3}^{*}\) (d) no acidic or basic group-

A certain compound gives negative test with ninhydrin and positive test with Benedict's solution; it is : |KCET 2000| (a) an amino acid (b) a monosaccharide (c) a lipid (d) a protein

The base present in \(\mathrm{DNA}_{;}\)but not in RNA is : (a) guanine (b) adenine (c) uracil (d) thymine

The test used for identifying peptide linkage in proteins is : [KCET 2001] (a) Borsche's test (b) Molisch's test (c) Ninhydrin test (d) Biuret test

A sugar that is not a disaccharide among the following is : [KCET 2002] (a) galactose (b) lactose (c) maltose (d) sucrose

Vitamin \(\mathrm{B}_{6}\) is known as: (a) riboflavin (b) thiamine (c) lactose (d) pyridoxin

Heterocyclic amino acid among these compounds is: [KCET 2002] (a) lysine (b) tyrosine (c) proline (d) serine

Purine derivative among the following bases is : (a) cytosine (b) guanine (c) uracil (d) thymine

The process by which synthesis of protein takes place based on the genetic information present in \(m\)-RNA is called : \(\quad\) |KCET 2003| (a) translation (b) transcription (c) replication (d) messenger hypothesis

The tripeptide hormone present in most living cells is: |KCET 2003] (a) glutathione (b) glutamine (c) oxytocin (d) ptyalin

An organic compound answers Molisch's test as well as Benedict's test, but it does not answer Scliwanoff's test. Most probably, it is: (a) sucrose (b) protein (c) fructose (d) maltose

Pick out the one which does not belong to the family: [KCET 2004] (a) pepsin (b) cellulose (c) ptyalin (d) lipase

A nucleoside on hydrolysis gives: [KCET 2004] (a) a heterocyclic base and orthophosphoric acid (b) an aldopentose, a heterocyclic base and orthophosphoric acid (c) an aldopentose and a heterocyclic base (d) an aldopentose and orthophosphoric acid

Pick out the unsaturated fatty acid from the following: KCET 2004] (a) stearic acid (b) lauric acid (c) olcic acid (d) palmitic acid

During protein synthesis, message of protein code is transferred by: [DPMT 1995] (a) DNA (b) \(m\)-RNA (c) \(t-\mathrm{RNA}\) (d) \(r\)-RNA

The metal present in \(\mathrm{B}_{12}\) is: (a) magnesium (b) iron (c) cobalt (d) manganese

The function of enzymes, in living system, is to: (a) transport energy (b) provide immunity (c) provide energy (d) catalyse biochemical reactions

The purine base present in RNA is: (a) guanine (b) thymine (c) cytosine (d) uracil

Haemoglobin is an example of: (a) protein (b) blood (c) fibrous protein (d) globular protein

Enzymes with two sites are called: [DPMT 1998] (a) apoenzyme (b) holoenzyme (c) conjugate enzyme (d) allosteric enzyme

The function of enzyme in the living system is to: (a) transport of oxygen (b) provide immunity (c) catalyse biochemical reactions (d) provide energy

The glucose is an example of: (a) disaccharide (b) aldohexose (c) ketohexose (d) none of these

Antibodies are: (a) carbohydrate (b) globular protein (c) immunoglobulins (d) none of these

Hexoses and pentoses are: (b) monosaccharides (a) disaccharides (d) oligosaccharides (c) polysaccharides

Name those biomolecules which are secreted by the endocrine glands: [DPMT 2000] (a) blood (b) hormones (c) vitamin (d) enzyme

How many hydrogen bonds are present between pair of thymine and adenine in DNA? [DPMT 2000] (a) 1-hydrogen bond (b) 2 -hydrogen bonds (c) 3 -hydrogen bonds (d) no bonds occur

Proteins are composed of: (a) \(\alpha\)-amino acids (b) carbohydrates (c) vitamins (d) mineral salts

A biological catalyst is essentially: [DPMT 2001] (a) an amino acid (b) a carbohydrates (c) an enzyme (d) a nitrogen molecule

Which of the following enzyme increases the puls rate and blood presure? [DPMT 2002] (a) Estrone (b) Cortisone (c) Adrenaline (d) Thyroxine

The reason for double helical structure of DNA is operation of : [DPMT 2004] (a) electrostatic attractions (b) van der Waal's forces (c) dipole-dipole interactions (d) hydrogen bonding