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AP Intermediate 1st Year Biomolecules — practice questions — page 2

Explore 49 free Biomolecules questions in AP Intermediate 1st Year Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Biomolecules questions and exercises with answers

Showing questions 31–49 of 49.

Each nucleotide in a nucleic acid containsRead the answer and worked solution →Enzymes speed up reactions byRead the answer and worked solution →A competitive inhibitor of an enzymeRead the answer and worked solution →NEET · Biology · Biomolecules · Vitamin ↔ DeficiencyRead the answer and worked solution →NEET · Biology · Biomolecules · Protein Structure LevelRead the answer and worked solution →NEET · Biology · Biomolecules · Glycosidic BondRead the answer and worked solution →NEET · Biology · Biomolecules · Tap PolysaccharidesRead the answer and worked solution →NEET · Biology · Biomolecules · Enzyme Activity FactorRead the answer and worked solution →NEET · Biology · Biomolecules · Biomolecule Term — TypingRead the answer and worked solution →NEET · Biology · Biomolecules · Tap Vitamins (Water-soluble)Read the answer and worked solution →NEET · Biology · Biomolecules · Saturated or UnsaturatedRead the answer and worked solution →NEET · Biology · Biomolecules · Protein FunctionRead the answer and worked solution →NEET · Biology · Biomolecules · Enzyme Action — MemoryRead the answer and worked solution →NEET · Biology · Biomolecules · Lipid in Plasma Membrane — Gap FillRead the answer and worked solution →NEET · Biology · Biomolecules · Tap Macromolecules in CellRead the answer and worked solution →NEET · Biology · Biomolecules · Reaction → EnzymeRead the answer and worked solution →NEET · Biology · Biomolecules · Hormone or EnzymeRead the answer and worked solution →NEET · Biology · Vitamin ↔ Deficiency DiseaseRead the answer and worked solution →NEET · Biology · Protein Structure LevelsRead the answer and worked solution →

Worked practice questions

Each nucleotide in a nucleic acid contains

  1. nitrogen base + pentose sugar + phosphate
  2. an amino group, carboxyl group, and R group
  3. two amino acids linked by a peptide bond
  4. glucose, fructose, and water
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Correct answer: A. nitrogen base + pentose sugar + phosphate

A nucleotide is the three-part building block of DNA and RNA: nitrogen base (A, G, C, T or U), pentose sugar (deoxyribose for DNA, ribose for RNA), and phosphate. Amino + carboxyl + R is an amino acid peptide bonds link amino acids, not nucleotides sugars don't assemble nucleic acids.

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Enzymes speed up reactions by

  1. raising the concentration of substrate inside the cell
  2. lowering the activation energy of the reaction
  3. providing reaction energy directly
  4. making the products less stable
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Correct answer: B. lowering the activation energy of the reaction

An enzyme reduces the activation-energy barrier by holding substrates in a favourable geometry and stabilising the transition state. The enzyme itself is unchanged. Substrate concentration is set by the cell, not the enzyme reactions don't get energy 'from' the enzyme product stability depends on the reaction, not the catalyst.

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A competitive inhibitor of an enzyme

  1. binds permanently away from the active site
  2. raises the temperature inside the enzyme
  3. resembles the substrate and occupies the active site
  4. splits the enzyme into smaller pieces
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Correct answer: C. resembles the substrate and occupies the active site

**Competitive inhibition:** the inhibitor is shape-similar to the substrate and competes for the active site. Excess substrate can outcompete it. Inhibitors that bind away from the active site (allosteric / non-competitive) act differently. Inhibitors don't raise temperature or fragment the enzyme.

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More Biology topics

The Living World & Biological ClassificationPhotosynthesis in Higher PlantsAnimal KingdomBody Fluids and CirculationBreathing and Exchange of GasesCell Cycle and Cell DivisionLocomotion and MovementNeural Control and Chemical Coordination