Which of the following bio-molecules is strictly not a polymer?
1. Carbohydrates
2. Proteins
3. Fats
4. Nucleic acids
Most of the polymerization reactions result from:
1. Redox reactions
2. Dehydration synthesis
3. Hydrolysis
4. Isomerization
The R group in a proteinaceous amino acid is hydroxymethyl. This amino acid:
1. is not an essential amino acid
2. is not genetically coded for
3. is involved in disulfide linkage
4. is acidic in nature
Identify the given nitrogenous base:
1. Adenine
2. Guanine
3. Thymine
4. Cytosine
Which of the following components is found in least amounts in an average cell?
1. Carbohydrates
2. Fats
3. Nucleic acids
4. Proteins
Most abundant protein in the whole of the biosphere is:
1. Collagen
2. Cellulose
3. RUBISCO
4. Keratin
Inulin is a:
1. Disaccharide containing two galactose
2. Disaccharide containing fructose and galactose
3. Polymer of fructose
4. Polysaccharide used in microbial culture
Adenine and guanine are:
1. Substituted purines
2. Substituted pyrimidines
3. Deoxyribonucleosides
4. Ribonucleotides
The first amino acid in the primary structure of a protein is termed as:
1. C – terminus amino acid
2. N – terminus amino acid
3. An imino acid
4. Alpha amino acid
Quaternary structure is seen in proteins that:
1. act as biochemical catalysts
2. are embedded within the plasma
membrane
3. are assembly of more than one subunits
4. do not have any structural role in the
cell
The double helix model of DNA by Watson and Crick exhibits its:
1. Primary structure
2. Secondary structure
3. Tertiary structure
4. Quaternary structure
The strands of the DNA double helix are:
1. identical
2. coiled around each other
3. parallel to each other
4. complemantary to each other
At each step of ascent, the helical strand of DNA turns
1. 360
2. 340
3. 200
4. 1800
The pitch of DNA helix is:
1. 0.34 nm
2. 3.4 nm
3. 34 nm
4. 340 nm
The blood concentration of blood glucose in a normal healthy human ranges between:
1. 4.5 – 5.0 mM
2. 45 – 50 mM
3. 70 – 100 nM
4. 100 – 150 mM
Almost all enzymes are:
1. Polysaccharides
2. Proteins
3. Nucleic acids
4. Lipids
Which of these can have catalytic activity?
1. RNA
2. DNA
3. Prostaglandins
4. Sterols
Enzymes speed up the chemical reactions by:
1. Getting used up in the reaction
2. Formation of different products
3. Converting endothermic reactions to exothermic
4. Lowering activation energy
The substrate concentration at which the enzyme catalyzed reaction achieves ½ Vmax is its ____ value.
1. Km
2. Kcat
3. pKa
4. Q10
Most common enzyme inhibition used in control of bacterial pathogens is:
1. Competitive
2. Non competitive
3. Uncompetitive
4. Mixed
Enzymes that catalyze removal of groups from substrates by mechanisms other than hydrolysis leaving double bonds are:
1. Dehygdrogenases
2. Transferases
3. Lyases
4. Ligases
The non protein constituent present in many enzymes is called:
1. Co-enzyme
2. Co-factor
3. Apoenzyme
4. Holoenzyme
Haem in hemoglobin:
1. is loosely bound
2. is the co-enzyme
3. is the prosthetic group
4. has no influence on activity of Hb
What is the co-factor for the proteolytic enzyme, carboxypeptidase?
1. Molybdenum
2. Manganese
3. Zinc
4. Copper
Most of the coenzymes contain:
1. Metal ions
2. FMN and FAD
3. Ribinucleoproteins
4. Vitamins
Which of the following is not an aromatic amino acid?
1. Phenylalanine
2. Threonine
3. Tyrosine
4. Tryptophan
The protein GLUT 4 is a/an:
1. Receptor protein
2. Transport protein
3. Antibody molecule
4. Enzyme
Most abundant protein in animal world is:
1. Keratin
2. Globin
3. Collagen
4. Amylase
Formation of glycosidic bond represents:
1. Dehydration
2. Hydrolysis
3. Dehydrogenation
4. Isomerization
Most hydrated and most stable form of DNA is known as:
1. A DNA
2. B DNA
3. C DNA
4. Z DNA