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Latest UKPSC Lecturer Biology Exam Question (Objective Questions), MCQ in English

Subjects : Concerned Subject (Biology)

Question Bank UKPSC Lecturer Biology Exam Paper 2 - English
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Concerned Subject (Biology)

Question 1Single Answer
Carbohydrates are composed of?
  1. A
    Only carbon and oxygen
  2. B
    Carbon, hydrogen, and oxygen
  3. C
    Nitrogen and hydrogen
  4. D
    Carbon and nitrogen
Question 2Single Answer
Monosaccharides are?
  1. A
    Simple sugars like glucose, fructose, galactose
  2. B
    Polymers of glucose
  3. C
    Only disaccharides
  4. D
    Only starch
Question 3Single Answer
Disaccharides are?
  1. A
    Polysaccharides
  2. B
    Single sugar units
  3. C
    Two monosaccharides joined by glycosidic bond
  4. D
    Lipids
Question 4Single Answer
Polysaccharides function as?
  1. A
    Only structural support
  2. B
    Only energy storage
  3. C
    Energy storage (starch, glycogen) and structural support (cellulose, chitin)
  4. D
    Only pigments
Question 5Single Answer
Glycogen is stored in?
  1. A
    Kidney
  2. B
    Blood
  3. C
    Liver and muscles
  4. D
    Brain only
Question 6Single Answer
Lipids are composed of?
  1. A
    Only nitrogen
  2. B
    Only carbon and oxygen
  3. C
    Only hydrogen
  4. D
    Carbon, hydrogen, and oxygen
Question 7Single Answer
Triglycerides are formed from?
  1. A
    Glycerol and three fatty acids
  2. B
    Glycerol only
  3. C
    Fatty acids only
  4. D
    Glucose and fatty acids
Question 8Single Answer
Saturated fatty acids have?
  1. A
    No double bonds in carbon chain
  2. B
    One double bond
  3. C
    Multiple double bonds
  4. D
    Only branched chains
Question 9Single Answer
Unsaturated fatty acids have?
  1. A
    No double bonds
  2. B
    One or more double bonds in carbon chain
  3. C
    Only single bonds
  4. D
    Only branched chains
Question 10Single Answer
Phospholipids are important for?
  1. A
    Membrane structure
  2. B
    Energy storage only
  3. C
    Pigments
  4. D
    Nucleic acids
Question 11Single Answer
Proteins are composed of?
  1. A
    Only nucleotides
  2. B
    Only sugars
  3. C
    Only fatty acids
  4. D
    Amino acids linked by peptide bonds
Question 12Single Answer
Enzymes are?
  1. A
    Sugars
  2. B
    Proteins that act as biological catalysts
  3. C
    Lipids
  4. D
    Nucleic acids
Question 13Single Answer
Structural proteins include?
  1. A
    Hemoglobin only
  2. B
    Collagen, keratin, elastin
  3. C
    Myosin only
  4. D
    Insulin only
Question 14Single Answer
Nucleic acids are composed of?
  1. A
    Only lipids
  2. B
    Only sugars
  3. C
    Only amino acids
  4. D
    Nucleotides containing a sugar, phosphate, and nitrogenous base
Question 15Single Answer
DNA is?
  1. A
    Lipid
  2. B
    Ribonucleic acid
  3. C
    Protein
  4. D
    Deoxyribonucleic acid storing genetic information
Question 16Single Answer
RNA is?
  1. A
    Lipid
  2. B
    DNA
  3. C
    Ribonucleic acid involved in protein synthesis
  4. D
    Protein
Question 17Single Answer
Vitamins are?
  1. A
    Sugars
  2. B
    Proteins
  3. C
    Organic compounds required in small amounts for metabolism
  4. D
    Lipids only
Question 18Single Answer
Fat-soluble vitamins include?
  1. A
    Only C
  2. B
    B and C
  3. C
    A, D, E, K
  4. D
    Only B12
Question 19Single Answer
Water-soluble vitamins include?
  1. A
    Only D
  2. B
    A, D, E, K
  3. C
    B-complex and C
  4. D
    Only K
Question 20Single Answer
Chlorophyll is a pigment important for?
  1. A
    Photosynthesis
  2. B
    Respiration
  3. C
    Transpiration
  4. D
    Osmosis
Question 21Single Answer
Carotenoids function as?
  1. A
    Only storage pigments
  2. B
    Only structural pigments
  3. C
    Accessory pigments in photosynthesis and antioxidants
  4. D
    Only lipids
Question 22Single Answer
Anthocyanins are?
  1. A
    Water-soluble pigments responsible for red, purple, blue colors
  2. B
    Lipid pigments
  3. C
    Protein pigments
  4. D
    Carbohydrates
Question 23Single Answer
Metabolism includes?
  1. A
    Only catabolism
  2. B
    Catabolism and anabolism
  3. C
    Only anabolism
  4. D
    Only energy storage
Question 24Single Answer
Catabolism is?
  1. A
    Only photosynthesis
  2. B
    Synthesis of complex molecules
  3. C
    Storage of energy
  4. D
    Breakdown of complex molecules into simpler ones releasing energy
Question 25Single Answer
Anabolism is?
  1. A
    Only respiration
  2. B
    Breakdown of molecules
  3. C
    Synthesis of complex molecules from simpler ones, consuming energy
  4. D
    Only osmosis
Question 26Single Answer
Glycolysis occurs in?
  1. A
    Nucleus
  2. B
    Mitochondria
  3. C
    Cytoplasm
  4. D
    Endoplasmic reticulum
Question 27Single Answer
Beta-oxidation of fatty acids occurs in?
  1. A
    Nucleus
  2. B
    Cytoplasm
  3. C
    Mitochondria
  4. D
    Ribosome
Question 28Single Answer
Classification of enzymes, enzyme kinetics, enzyme regulation, mechanism of enzyme catalysis, isozymes and coenzymes.
    Question 29Single Answer
    Enzymes are?
    1. A
      Products
    2. B
      Substrates
    3. C
      Biological catalysts that accelerate chemical reactions
    4. D
      Hormones
    Question 30Single Answer
    Based on reaction type, enzymes are classified as?
    1. A
      Only transferases
    2. B
      Only hydrolases
    3. C
      Only ligases
    4. D
      Oxidoreductases, transferases, hydrolases, lyases, isomerases, ligases
    Question 31Single Answer
    Oxidoreductases catalyze?
    1. A
      Hydrolysis
    2. B
      Transfer of functional groups
    3. C
      Oxidation-reduction reactions
    4. D
      Isomerization
    Question 32Single Answer
    Transferases catalyze?
    1. A
      Formation of double bonds
    2. B
      Oxidation-reduction reactions
    3. C
      Hydrolysis
    4. D
      Transfer of functional groups between molecules
    Question 33Single Answer
    Hydrolases catalyze?
    1. A
      Isomerization
    2. B
      Oxidation
    3. C
      Reduction
    4. D
      Hydrolytic cleavage of bonds using water
    Question 34Single Answer
    Lyases catalyze?
    1. A
      Redox reactions
    2. B
      Hydrolysis
    3. C
      Transfer of groups
    4. D
      Addition or removal of groups to form double bonds
    Question 35Single Answer
    Isomerases catalyze?
    1. A
      Oxidation only
    2. B
      Rearrangement of atoms within a molecule
    3. C
      Hydrolysis only
    4. D
      Ligase reactions
    Question 36Single Answer
    Ligases catalyze?
    1. A
      Isomerization
    2. B
      Breaking molecules
    3. C
      Joining of two molecules using ATP
    4. D
      Oxidation only
    Question 37Single Answer
    Apoenzyme is?
    1. A
      Protein part of enzyme without cofactor
    2. B
      Complete enzyme with cofactor
    3. C
      Only cofactor
    4. D
      Substrate
    Question 38Single Answer
    Holoenzyme is?
    1. A
      Only cofactor
    2. B
      Only protein part
    3. C
      Complete enzyme with apoenzyme and cofactor
    4. D
      Substrate
    Question 39Single Answer
    Cofactors can be?
    1. A
      Only metal ions
    2. B
      Metal ions or organic molecules (coenzymes)
    3. C
      Only vitamins
    4. D
      Only substrates
    Question 40Single Answer
    Coenzymes are?
    1. A
      Inhibitors
    2. B
      Protein part of enzyme
    3. C
      Substrates
    4. D
      Organic molecules that assist enzymes in catalysis
    Question 41Single Answer
    Isozymes are?
    1. A
      Enzyme inhibitors
    2. B
      Different substrates
    3. C
      Different enzymes catalyzing the same reaction
    4. D
      Cofactors
    Question 42Single Answer
    Enzyme activity depends on?
    1. A
      Only pH
    2. B
      Only substrate
    3. C
      Only temperature
    4. D
      Temperature, pH, substrate concentration, cofactors
    Question 43Single Answer
    Michaelis-Menten constant (Km) represents?
    1. A
      Substrate concentration at half-maximal velocity
    2. B
      Maximum velocity
    3. C
      Enzyme concentration
    4. D
      Product concentration
    Question 44Single Answer
    Vmax represents?
    1. A
      Km value
    2. B
      Half-maximal velocity
    3. C
      Maximum velocity of enzyme-catalyzed reaction
    4. D
      Substrate concentration
    Question 45Single Answer
    Competitive inhibition occurs when?
    1. A
      Inhibitor competes with substrate for active site
    2. B
      Inhibitor binds allosteric site
    3. C
      Enzyme denatures
    4. D
      Cofactor binds
    Question 46Single Answer
    Non-competitive inhibition occurs when?
    1. A
      Inhibitor binds allosteric site and reduces enzyme activity
    2. B
      Inhibitor competes for active site
    3. C
      Only substrate binds
    4. D
      Only product binds
    Question 47Single Answer
    Feedback inhibition is?
    1. A
      Substrate activates enzyme
    2. B
      End product inhibits enzyme in its biosynthetic pathway
    3. C
      Enzyme denatures
    4. D
      Only coenzyme binds
    Question 48Single Answer
    Enzyme-substrate complex formation is explained by?
    1. A
      Only hydrolysis
    2. B
      Only diffusion
    3. C
      Only mutation
    4. D
      Lock-and-key model and induced-fit model
    Question 49Single Answer
    Turnover number (kcat) represents?
    1. A
      Substrate concentration
    2. B
      Number of substrate molecules converted per enzyme molecule per second
    3. C
      Inhibitor concentration
    4. D
      Product concentration
    Question 50Single Answer
    Activation energy is?
    1. A
      Total energy of reactants
    2. B
      Energy required to initiate a chemical reaction
    3. C
      Energy released
    4. D
      Only heat energy
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