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Biochemistry > Exam Questions Multiple choice > Flashcards

Exam Questions Multiple choice Flashcards

1
Q
  1. What is organic chemistry primarily concerned with?
    a) Study of minerals and metals
    b) Study of carbon-containing compounds
    c) Study of ionic compounds
    d) Study of nuclear reactions
A

b) Study of carbon-containing compounds

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2
Q
  1. Organic molecules are primarily composed of which elements?
    a) C, H, O, N
    b) C, H, He, Li
    c) Si, H, O, N
    d) Fe, C, H, O
A

a) C, H, O, N

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3
Q
  1. Which property of carbon allows it to form long chains?
    a) High electronegativity
    b) Tendency to form ionic bonds
    c) Catenation
    d) High reactivity
A

c) Catenation

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4
Q
  1. What is the hybridization of the carbon atom in ethene (C₂H₄)?
    a) sp
    b) sp²
    c) sp³
    d) sp³d
A

b) sp²

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5
Q
  1. Which type of bond is stronger?
    a) Sigma (σ) bond
    b) Pi (π) bond
    c) Hydrogen bond
    d) London dispersion force
A

a) Sigma (σ) bond

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6
Q
  1. How many sigma (σ) and pi (π) bonds are in ethyne (C₂H₂)?
    a) 1 σ and 2 π bonds
    b) 2 σ and 2 π bonds
    c) 3 σ and 1 π bonds
    d) 1 σ and 1 π bond
A

a) 1 σ and 2 π bonds

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7
Q
  1. A carbon bonded to three hydrogens is classified as:
    a) Primary
    b) Secondary
    c) Tertiary
    d) Quaternary
A

a) Primary

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8
Q
  1. Which functional group is most likely to increase water solubility?
    a) Hydroxyl (-OH)
    b) Carbonyl (-C=O)
    c) Alkyl (-CH₃)
    d) Ether (-O-)
A

a) Hydroxyl (-OH)

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9
Q
  1. How does increasing hydrocarbon chain length affect solubility in water?
    a) Increases
    b) Decreases
    c) No effect
    d) Becomes ionic
A

b) Decreases

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10
Q
  1. Adding more hydrocarbons to a molecule typically:
    a) Increases boiling point
    b) Decreases boiling point
    c) Increases polarity
    d) Decreases molecular weight
A

a) Increases boiling point

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10
Q
  1. Which functional group is likely to show hydrogen bonding?
    a) Alkene
    b) Aldehyde
    c) Alcohol
    d) Ether
A

c) Alcohol

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11
Q
  1. Why do alcohols have higher boiling points than hydrocarbons?
    a) Greater molecular weight
    b) Hydrogen bonding
    c) Ionic bonding
    d) London dispersion forces
A

b) Hydrogen bonding

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12
Q
  1. What type of bond characterizes the benzene ring?
    a) Alternating single and double bonds
    b) Delocalized π electrons
    c) Triple bonds
    d) Purely covalent bonds
A

b) Delocalized π electrons

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13
Q
  1. What is the molecular formula of benzene?
    a) C₅H₆
    b) C₆H₆
    c) C₆H₁₂
    d) C₇H₈
A

b) C₆H₆

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14
Q
  1. Which functional group is represented by -COOH?
    a) Ketone
    b) Aldehyde
    c) Carboxylic acid
    d) Ester
A

c) Carboxylic acid

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15
Q
  1. What is the functional group in an alcohol?
    a) -CHO
    b) -COOH
    c) -OH
    d) -O-
A

c) -OH

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16
Q
  1. What is the functional group in ethers?
    a) R-OH
    b) R-CO-R
    c) R-O-R’
    d) R-CHO
A

c) R-O-R’

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17
Q
  1. What is the dominant intermolecular force in ketones?
    a) Hydrogen bonding
    b) Dipole-dipole interactions
    c) London dispersion forces
    d) Ionic bonding
A

b) Dipole-dipole interactions

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18
Q
  1. Alcohols experience which type of intermolecular force?
    a) London dispersion
    b) Dipole-dipole
    c) Hydrogen bonding
    d) Covalent bonding
A

c) Hydrogen bonding

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19
Q
  1. Which of these is a geometric isomer?
    a) Cis-2-butene and trans-2-butene
    b) Ethanol and dimethyl ether
    c) Propane and butane
    d) Glucose and fructose
A

a) Cis-2-butene and trans-2-butene

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20
Q
  1. Optical isomers differ in:
    a) Molecular formula
    b) Connectivity of atoms
    c) Spatial arrangement around a chiral center
    d) Functional groups present
A

c) Spatial arrangement around a chiral center

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21
Q
  1. Which glycosidic linkage is found in maltose?
    a) α-(1→4)
    b) β-(1→4)
    c) α-(1→6)
    d) β-(1→6)
A

a) α-(1→4)

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21
Q
  1. What test is used to detect reducing sugars?
    a) Tollen’s test
    b) Benedict’s test
    c) Fehling’s test
    d) All of the above
A

d) All of the above

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22
Q
  1. Which level of protein structure involves α-helices and β-sheets?
    a) Primary
    b) Secondary
    c) Tertiary
    d) Quaternary
A

b) Secondary

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23
Q
  1. Which environmental factor can denature proteins?
    a) High temperature
    b) Low pH
    c) High pH
    d) All of the above
A

d) All of the above

24
Q
  1. What is the main function of Fe²⁺ in heme?
    a) Catalysis
    b) Oxygen binding
    c) Electron transport
    d) DNA synthesis
A

b) Oxygen binding

25
Q
  1. Which is not a category of lipids?
    a) Triacylglycerols
    b) Phospholipids
    c) Steroids
    d) Glycoproteins
A

d) Glycoproteins

26
Q
  1. What is the result of hydrolyzing a triacylglycerol?
    a) Glycerol and fatty acids
    b) Alcohol and carboxylic acids
    c) Esters and water
    d) Ketones and alcohols
A

a) Glycerol and fatty acids

27
Q
  1. Which pair of molecules are functional isomers?
    a) Ethanol and dimethyl ether
    b) Glucose and galactose
    c) Cis-2-butene and trans-2-butene
    d) Propane and butane
A

a) Ethanol and dimethyl ether

28
Q
  1. What distinguishes positional isomers?
    a) Different molecular formulas
    b) Different connectivity of atoms
    c) Functional groups in different positions
    d) Mirror-image arrangements
A

c) Functional groups in different positions

29
Q
  1. What is the functional group in a ketone?
    a) -COH
    b) -COOH
    c) -CO-
    d) -CH₃
A

c) -CO-

30
Q
  1. Which functional group is found in amines?
    a) -OH
    b) -NH₂
    c) -CHO
    d) -COOR
A

b) -NH₂

31
Q
  1. Which functional group contains a carbon atom double-bonded to oxygen and single-bonded to hydrogen?
    a) Ketone
    b) Aldehyde
    c) Ester
    d) Ether
A

b) Aldehyde

32
Q
  1. What is the general formula for an ester?
    a) R-COOH
    b) R-COOR’
    c) R-OH
    d) R-NH₂
A

b) R-COOR’

33
Q
  1. Which type of hydrocarbon is most soluble in water?
    a) Alkanes
    b) Alkenes
    c) Aromatic hydrocarbons
    d) None of the above
A

d) None of the above

34
Q
  1. Which molecule is more soluble in water?
    a) Methanol
    b) Pentanol
    c) Hexane
    d) Benzene
A

a) Methanol

35
Q
  1. Which compound has the highest boiling point?
    a) Ethanol
    b) Propane
    c) Butane
    d) Methane
A

a) Ethanol

36
Q
  1. Why does adding a hydrocarbon chain increase boiling points?
    a) Increased molecular weight
    b) Increased hydrogen bonding
    c) Increased ionic interactions
    d) Decreased polarity
A

a) Increased molecular weight

37
Q
  1. Which property explains the stability of benzene?
    a) Resonance stabilization
    b) High bond energy
    c) Lack of reactivity
    d) Strong π-bonds only
A

a) Resonance stabilization

38
Q
  1. How many π-electrons are delocalized in a benzene ring?
    a) 2
    b) 4
    c) 6
    d) 8
A

c) 6

39
Q
  1. Which intermolecular force is the weakest?
    a) London dispersion forces
    b) Dipole-dipole interactions
    c) Hydrogen bonding
    d) Ionic bonding
A

a) London dispersion forces

40
Q
  1. What is the strongest intermolecular force present in amines?
    a) London dispersion
    b) Dipole-dipole interactions
    c) Hydrogen bonding
    d) Covalent bonding
A

c) Hydrogen bonding

41
Q
  1. Which monosaccharide is a reducing sugar?
    a) Sucrose
    b) Glucose
    c) Mannitol
    d) Cellulose
A

b) Glucose

42
Q
  1. What is the glycosidic linkage in lactose?
    a) α-(1→4)
    b) β-(1→4)
    c) α-(1→6)
    d) β-(1→6)
A

b) β-(1→4)

43
Q
  1. The primary structure of a protein is determined by:
    a) Sequence of amino acids
    b) Hydrogen bonding
    c) Hydrophobic interactions
    d) Ionic interactions
A

a) Sequence of amino acids

44
Q
  1. Which bond is responsible for the secondary structure of proteins?
    a) Covalent bonds
    b) Hydrogen bonds
    c) Ionic bonds
    d) Disulfide bonds
A

b) Hydrogen bonds

45
Q
  1. Which level of protein structure involves multiple polypeptide chains?
    a) Primary
    b) Secondary
    c) Tertiary
    d) Quaternary
A

d) Quaternary

46
Q
  1. Phospholipids are major components of:
    a) Hormones
    b) Cell membranes
    c) Energy storage molecules
    d) Enzymes
A

b) Cell membranes

47
Q
  1. Which of the following is a saturated fatty acid?
    a) Palmitic acid
    b) Oleic acid
    c) Linoleic acid
    d) Arachidonic acid
A

a) Palmitic acid

48
Q
  1. A triglyceride is composed of:
    a) Three glycerols and one fatty acid
    b) One glycerol and three fatty acids
    c) Two glycerols and two fatty acids
    d) One fatty acid and one glycerol
A

b) One glycerol and three fatty acids

49
Q
  1. What is organic chemistry primarily concerned with?
    a) Study of minerals and metals
    b) Study of carbon-containing compounds
    c) Study of ionic compounds
    d) Study of nuclear reactions
A

b) Study of carbon-containing compounds

50
Q
  1. Which property of carbon allows it to form long chains and rings?
    a) High electronegativity
    b) Tendency to form ionic bonds
    c) Ability to catenate (self-bond)
    d) Low melting point
A

c) Ability to catenate (self-bond)

51
Q
  1. What is the hybridization of the carbon atom in methane (CH₄)?
    a) sp
    b) sp²
    c) sp³
    d) sp³d
A

c) sp³

52
Q
  1. Which functional group is most likely to increase water solubility?
    a) Hydroxyl (-OH)
    b) Alkyl (-CH₃)
    c) Methyl (-CH₃)
    d) Carbonyl (-C=O)
A

a) Hydroxyl (-OH)

53
Q
  1. Which of the following is a tertiary carbon?
    a) A carbon bonded to one other carbon
    b) A carbon bonded to two other carbons
    c) A carbon bonded to three other carbons
    d) A carbon bonded to four other carbons
A

c) A carbon bonded to three other carbons

54
Q
  1. What type of bonds are found in a benzene ring?
    a) Alternating single and double bonds
    b) Only double bonds
    c) Only single bonds
    d) A delocalized π-electron system
A

d) A delocalized π-electron system

55
Q
  1. Which of the following is an example of a geometric isomer?
    a) Cis-2-butene and trans-2-butene
    b) Glucose and fructose
    c) Ethanol and dimethyl ether
    d) Propane and butane
A

a) Cis-2-butene and trans-2-butene

56
Q
  1. What type of intermolecular force is most significant between alcohol molecules?
    a) London dispersion forces
    b) Dipole-dipole interactions
    c) Hydrogen bonding
    d) Ionic bonding
A

c) Hydrogen bonding

57
Q
  1. Which functional group is nonpolar?
    a) Hydroxyl (-OH)
    b) Carbonyl (-C=O)
    c) Alkyl (-CH₃)
    d) Amine (-NH₂)
A

c) Alkyl (-CH₃)

58
Q
  1. How does the addition of hydrocarbon chains affect the boiling point of a molecule?
    a) Increases due to stronger London dispersion forces
    b) Decreases due to weaker intermolecular forces
    c) Stays the same regardless of chain length
    d) Decreases due to increased solubility
A

a) Increases due to stronger London dispersion forces

59
Q
  1. Which monosaccharide has the Fischer projection with all hydroxyl groups on the right side?
    a) D-glucose
    b) L-glucose
    c) D-galactose
    d) D-fructose
A

a) D-glucose

Biochemistry (2 decks)

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