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  2. MCAT — Full Content Review
  3. Biochemistry: Amino Acids, Enzymes and Metabolism
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MCAT — Full Content Review

Content review across all four MCAT sections: biology, biochemistry, general and organic chemistry, physics, psychology and sociology, plus CARS reasoning vocabulary. Breadth-first recall drilling for pre-med candidates.

Medicine
PShared by Priya Nair
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Biochemistry: Amino Acids, Enzymes and Metabolism

The twenty amino acids and their side-chain chemistry, enzyme kinetics and inhibition, and the central metabolic pathways.

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Content

64 total questions

MCQ: 16
Fill-in: 12
Flashcards: 20
Pair match: 16
Biochemistry: Amino Acids, Enzymes and Metabolism – Flashcards
Flashcards

Card #1

Which proteinogenic amino acid is achiral, and why?

Card #2

Which three amino acids have aromatic side chains?

Card #3

Which amino acids carry a positive charge at physiological pH?

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Biochemistry: Amino Acids, Enzymes and Metabolism – MCQ
Multiple Choice Questions
  1. 1. Which amino acid has a thiol (–SH) side chain capable of forming disulfide bonds?

    • Cysteine
    • Serine
    • Methionine
    • Threonine
  2. 2. A peptide bond forms between which two groups?

    • The alpha-carboxyl group of one amino acid and the alpha-amino group of the next, releasing water
    • Two side-chain hydroxyl groups, releasing water
    • The alpha-amino groups of two adjacent residues
    • A side-chain thiol and an alpha-carboxyl group
  3. 3. Which level of protein structure is stabilised chiefly by hydrogen bonding between backbone amide and carbonyl groups?

    • Secondary structure
    • Primary structure
    • Tertiary structure
    • Quaternary structure
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Biochemistry: Amino Acids, Enzymes and Metabolism – Fill-in-the-blank
Fill in the Blank
  1. 1. The amino acid ___ is the only proteinogenic amino acid whose side chain is a single hydrogen atom, making it achiral.

    Answer:glycinealso: Gly

    Hint: Smallest of the twenty

  2. 2. A competitive inhibitor raises the apparent ___ while leaving Vmax unchanged.

    Answer:Kmalso: K_m, KM, K m

    Hint: The Michaelis constant

  3. 3. The rate-limiting enzyme of glycolysis is ___.

    Answer:phosphofructokinase-1also: PFK-1, PFK1, phosphofructokinase 1, phosphofructokinase

    Hint: Often abbreviated PFK-1

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Biochemistry: Amino Acids, Enzymes and Metabolism – Pair match
Pair Match
Aspartate↔Acidic; negatively charged at physiological pH
Lysine↔Basic; positively charged at physiological pH
Proline↔Rigid ring with a secondary amine; disrupts alpha helices
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