Biochemistry Makeup CAT (Past Paper, Set 2)

10 clinical MCQs in Biochemistry. The following can be referred to as a Lewis acid. Kenya, Africa and global revision.

Questions, Answers & Explanations

1. Q1. The following can be referred to as a Lewis acid

   • O^2-
   • H₂O
   • CH₂
   • NH₃
   • Cu²⁺ HBC 100: BIOCHEMISTRY CAT 1 Make-Up 2021

   Answer: O^2-

2. Q2. The following is true about atomic orbital

   • Is the probability density of finding an electron around the nucleus.
   • Shape defined by its angular momentum quantum number
   • Has quantized energy levels
   • All the other choices are true.
   • Always has a defined spatial arrangement. HBC 100: BIOCHEMISTRY CAT 1 Make-Up 2021

   Answer: Is the probability density of finding an electron around the nucleus.

3. Q3. Strength of a base in aqueous solutions can be determined by all the following except;

   • None of the other choices
   • pOH
   • Hydrogen in concentration HBC 100: BIOCHEMISTRY CAT 1 Make-Up 2021

   Answer: None of the other choices

4. Q4. The following are noble (rare) gases except;

   • Neon
   • Radon
   • Helium
   • Argon
   • Hydrogen HBC 100: BIOCHEMISTRY CAT 1 Make-Up 2021

   Answer: Neon

5. Q5. The following can be referred to as a Lewis acid Select one:

   • O²⁻
   • H₂O
   • CH₂
   • NH₃
   • Cu²⁺ HBC 100: BIOCHEMISTRY CAT 1 Make-Up 2021

   Answer: O²⁻

6. Q6. Reaction of an ester with a strong base is called Select one:

   • Saponification
   • Reverse esterification
   • Oxidation
   • Condensation
   • Esterification HBC 100: BIOCHEMISTRY CAT 1 Make-Up 2021

   Answer: Saponification

7. Q7. The formula 1s² 2p⁶ 3s² 3p⁶ corresponds to; Select one:

   • Neon
   • All the other choices
   • Na+
   • Al3+
   • Mg2+ HBC 100: BIOCHEMISTRY CAT 1 Make-Up 2021

   Answer: Neon

8. Q8. The pH of a 10⁻⁸ M HCl solution prepared with pure water at pH 7.0 is closest to . Select one:

   • They react with bases to form salts which are often more soluble than the original acid
   • At low molecular weights they are liquids with sharp stinging odors
   • They form hydrogen bonds, causing their boiling points to be higher than expected on the basis of molecular weight
   • They undergo substitution reactions involving the -OH group
   • When they behave as acids, the -OH group is lost leaving the CO- ion

   Answer: They react with bases to form salts which are often more soluble than the original acid

9. Q9. Two functional groups present in all amino acids are the group and the group.

   • London dispersion
   • Metallic bond
   • Covalent bond
   • Hydrogen bond
   • Ionic bond

   Answer: London dispersion

10. Q10. A solution containing a weak base and its conjugate acid is a solution because

    • Buffer...it contains both acidic and basic species that neutralize added base or acid
    • Saturated...it is in equilibrium with a crystalline solid
    • Basic...excess hydronium ion is present
    • Acidic...excess hydroxide ion is present
    • Neutral...the weak base is neutralized by its conjugate acid HBC 100: BIOCHEMISTRY CAT 1 Make-Up 2021

    Answer: Buffer...it contains both acidic and basic species that neutralize added base or acid