Prepare for the PPSC Analytical Chemist exam with this Biochemistry Quiz, designed to test your knowledge of key biochemical concepts. Practice with expertly crafted MCQs to boost your confidence and improve your chances of success. Stay ahead with QuaidianPoint’s top-quality exam preparation!
Which of the following is a monosaccharide? a) Sucrose b) Maltose c) Glucose d) Lactose Answer: c) Glucose
The simplest aldose is: a) Glyceraldehyde b) Ribose c) Fructose d) Galactose Answer: a) Glyceraldehyde
D-Glucose and D-Galactose are: a) Anomers b) Epimers c) Enantiomers d) Diastereomers Answer: b) Epimers
The anomeric carbon in glucose is: a) C-1 b) C-2 c) C-4 d) C-5 Answer: a) C-1
Which glycosidic bond is present in maltose? a) α(1→4) b) β(1→4) c) α(1→2) d) β(1→6) Answer: a) α(1→4)
Sucrose is composed of: a) Glucose + Glucose b) Glucose + Fructose c) Galactose + Glucose d) Fructose + Fructose Answer: b) Glucose + Fructose
Cellulose is a polymer of: a) α-D-Glucose b) β-D-Glucose c) α-D-Fructose d) β-D-Galactose Answer: b) β-D-Glucose
Which polysaccharide is branched? a) Amylose b) Cellulose c) Amylopectin d) Chitin Answer: c) Amylopectin
The Haworth projection of α-D-galactose shows the -OH group on the anomeric carbon: a) Above the ring b) Below the ring c) On the same side as CH₂OH d) Opposite to CH₂OH Answer: b) Below the ring
Glycoproteins are proteins with: a) Lipids attached b) Carbohydrates attached c) Phosphates attached d) Metals attached Answer: b) Carbohydrates attached
The primary structure of a protein refers to: a) The sequence of amino acids b) The α-helix formation c) The disulfide bonds d) The quaternary structure Answer: a) The sequence of amino acids
Which bond is NOT involved in stabilizing the tertiary structure of proteins? a) Hydrogen bonds b) Disulfide bonds c) Glycosidic bonds d) Hydrophobic interactions Answer: c) Glycosidic bonds
In sickle cell anemia, the mutation replaces glutamic acid with: a) Valine b) Alanine c) Leucine d) Serine Answer: a) Valine
The α-helix is stabilized primarily by: a) Disulfide bonds b) Hydrogen bonds c) Ionic bonds d) Van der Waals forces Answer: b) Hydrogen bonds
Which protein structure level involves multiple polypeptide chains? a) Primary b) Secondary c) Tertiary d) Quaternary Answer: d) Quaternary
Myoglobin binds oxygen using a: a) Calcium ion b) Heme group c) Zinc finger d) Phospholipid Answer: b) Heme group
Hemoglobin exhibits: a) Negative cooperativity b) Positive cooperativity c) No cooperativity d) Random binding Answer: b) Positive cooperativity
The β-pleated sheet is an example of: a) Primary structure b) Secondary structure c) Tertiary structure d) Quaternary structure Answer: b) Secondary structure
Chaperones assist in: a) Protein denaturation b) Protein folding c) Protein degradation d) Protein synthesis Answer: b) Protein folding
Denaturation of proteins disrupts: a) Primary structure b) Secondary and tertiary structures c) Only quaternary structure d) Covalent bonds in the backbone Answer: b) Secondary and tertiary structures
Triacylglycerols are esters of: a) Glycerol and fatty acids b) Glycerol and phosphate c) Sphingosine and fatty acids d) Cholesterol and fatty acids Answer: a) Glycerol and fatty acids
Membrane lipids are typically: a) Hydrophilic b) Amphipathic c) Hydrophobic d) Neutral Answer: b) Amphipathic
Which lipid is a major component of cell membranes? a) Triacylglycerol b) Phospholipid c) Steroid d) Wax Answer: b) Phospholipid
The fluidity of membranes is increased by: a) Saturated fatty acids b) Cholesterol c) Unsaturated fatty acids d) Long-chain fatty acids Answer: c) Unsaturated fatty acids
Lipid bilayers are permeable to: a) Ions b) Small hydrophobic molecules c) Large polar molecules d) Proteins Answer: b) Small hydrophobic molecules
The heme group in hemoglobin binds: a) Oxygen b) Carbon dioxide c) Nitrogen d) Hydrogen Answer: a) Oxygen
The prosthetic group in myoglobin is: a) NAD+ b) FAD c) Heme d) Biotin Answer: c) Heme
Which technique is used to determine protein tertiary structure? a) NMR spectroscopy b) Mass spectrometry c) UV-Vis spectroscopy d) Thin-layer chromatography Answer: a) NMR spectroscopy
In the Fischer projection, the horizontal lines represent bonds: a) Projecting backward b) Projecting forward c) In the plane d) Rotating freely Answer: b) Projecting forward
The D- and L- notation in sugars is based on the configuration of: a) The anomeric carbon b) The penultimate carbon c) The carbonyl carbon d) The terminal carbon Answer: b) The penultimate carbon
Which of the following is a reducing sugar? a) Sucrose b) Lactose c) Trehalose d) Raffinose Answer: b) Lactose
The term “anomers” refers to sugars that differ in configuration at the: a) Penultimate carbon b) Anomeric carbon c) Terminal carbon d) Chiral center farthest from the carbonyl group Answer: b) Anomeric carbon
The β-1,4-glycosidic bond is found in: a) Amylose b) Cellulose c) Glycogen d) Amylopectin Answer: b) Cellulose
Which of the following is a heteropolysaccharide? a) Starch b) Cellulose c) Glycogen d) Hyaluronic acid Answer: d) Hyaluronic acid
The primary function of glycogen is: a) Structural support b) Energy storage in animals c) Energy storage in plants d) Cell signaling Answer: b) Energy storage in animals
The oxygen-binding site in myoglobin includes: a) A zinc ion b) A copper ion c) An iron ion d) A magnesium ion Answer: c) An iron ion
Which amino acid is involved in disulfide bond formation? a) Serine b) Cysteine c) Methionine d) Threonine Answer: b) Cysteine
The α-helix is a common feature of: a) Silk fibroin b) Collagen c) Myoglobin d) β-Keratin Answer: c) Myoglobin
Which of the following is NOT a force stabilizing protein tertiary structure? a) Hydrophobic interactions b) Hydrogen bonds c) Glycosidic bonds d) Disulfide bonds Answer: c) Glycosidic bonds
The quaternary structure of hemoglobin consists of: a) One polypeptide chain b) Two polypeptide chains c) Three polypeptide chains d) Four polypeptide chains Answer: d) Four polypeptide chains
Which of the following is true about the boat and chair conformations of pyranose rings? a) The chair form is more stable due to less steric hindrance b) The boat form is more stable due to hydrogen bonding c) Both forms are equally stable d) The boat form is never observed Answer: a) The chair form is more stable due to less steric hindrance
The term “proteoglycan” refers to a molecule where: a) Protein is the largest component by weight b) Carbohydrate is the largest component by weight c) Lipid is the largest component by weight d) Nucleic acid is the largest component by weight Answer: b) Carbohydrate is the largest component by weight
The binding of oxygen to hemoglobin is influenced by: a) pH only b) CO₂ only c) 2,3-BPG only d) All of the above Answer: d) All of the above
Which of the following is a characteristic of fibrous proteins? a) Soluble in water b) Compact, spherical shape c) Structural role d) Enzymatic activity Answer: c) Structural role
The term “denaturation” refers to the loss of: a) Primary structure b) Secondary and tertiary structure c) Covalent bonds d) Amino acid sequence Answer: b) Secondary and tertiary structure
Which of the following is NOT a denaturing agent? a) Urea b) Heat c) pH change d) Sucrose Answer: d) Sucrose
The heme group in hemoglobin is bound to the protein via: a) A histidine residue b) A cysteine residue c) A lysine residue d) A glutamate residue Answer: a) A histidine residue
The term “allosteric effect” refers to: a) Changes in protein structure at one site affecting another site b) The binding of small molecules to the active site c) The disruption of protein structure d) The formation of disulfide bonds Answer: a) Changes in protein structure at one site affecting another site
Which of the following is a function of glycoproteins? a) Energy storage b) Membrane function c) Oxygen transport d) DNA replication Answer: b) Membrane function
The term “mucin” refers to a glycoprotein that primarily functions as a: a) Structural component b) Lubricant c) Enzyme d) Hormone Answer: b) Lubricant
The Fischer projection of a sugar is a: a) 3D representation b) 2D representation c) Circular representation d) Spherical representation Answer: b) 2D representation
The term “axial” and “equatorial” refer to positions in the: a) Fischer projection b) Haworth projection c) Chair conformation d) Boat conformation Answer: c) Chair conformation
The term “epimer” refers to sugars that differ in configuration at: a) One chiral carbon b) The anomeric carbon c) All chiral carbons d) The carbonyl carbon Answer: a) One chiral carbon
The term “oligosaccharide” refers to a carbohydrate with: a) 1-10 monosaccharide units b) 10-100 monosaccharide units c) More than 100 monosaccharide units d) Only 1 monosaccharide unit Answer: a) 1-10 monosaccharide units
The term “homopolysaccharide” refers to a polysaccharide composed of: a) One type of monosaccharide b) Two types of monosaccharides c) Three types of monosaccharides d) No monosaccharides Answer: a) One type of monosaccharide
The term “heteropolysaccharide” refers to a polysaccharide composed of: a) One type of monosaccharide b) Two or more types of monosaccharides c) Only glucose units d) Only fructose units Answer: b) Two or more types of monosaccharides
The term “glycosidic bond” refers to a bond between: a) Two amino acids b) Two monosaccharides c) Two fatty acids d) Two nucleotides Answer: b) Two monosaccharides
The term “anomeric carbon” refers to the carbon that was part of the: a) Aldehyde or ketone group b) Hydroxyl group c) Methyl group d) Carboxyl group Answer: a) Aldehyde or ketone group
The term “Haworth projection” is used to represent the: a) Linear form of sugars b) Cyclic form of sugars c) Fischer projection d) Chair conformation Answer: b) Cyclic form of sugars
The term “pyranose” refers to a sugar with a: a) 5-membered ring b) 6-membered ring c) 7-membered ring d) Linear structure Answer: b) 6-membered ring