Membrane and Nucleic Acids Biology Quiz

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Questions and Answers

What is the purpose of glycolysis?

  • To produce glucose from pyruvate
  • To produce ATP from glucose (correct)
  • To break down glucose into pyruvate
  • To convert pyruvate into acetyl CoA

Which enzyme is involved in the citric acid cycle?

  • RNA polymerase
  • Ribonuclease
  • Citrate synthase (correct)
  • DNA polymerase

What is the purpose of gluconeogenesis?

  • To produce glucose from non-carbohydrate precursors (correct)
  • To convert pyruvate into acetyl CoA
  • To break down glucose into pyruvate
  • To degrade glycogen into glucose

What is the main product of the pentose phosphate pathway?

<p>NADPH (B)</p> Signup and view all the answers

Which molecule acts as a mobile electron carrier in the electron transport chain?

<p>Ubiquinone (UQ) (B)</p> Signup and view all the answers

What is the role of ATP synthase in oxidative phosphorylation?

<p>To establish a proton gradient for ATP production (A)</p> Signup and view all the answers

In protein folding, which of the following is involved in forming the tertiary structure?

<p>Disulfide bonds (A)</p> Signup and view all the answers

When reading a titration curve for an amino acid, which region indicates the buffering capacity of the molecule?

<p>Where the curve plateaus (C)</p> Signup and view all the answers

Which of the following interactions is primarily responsible for stabilizing the α-helix secondary structure in proteins?

<p>Hydrogen bonds (B)</p> Signup and view all the answers

In enzyme kinetics, which type of inhibition involves a reversible binding of the inhibitor to the enzyme-substrate complex?

<p>Non-competitive inhibition (A)</p> Signup and view all the answers

Which amino acid interaction is crucial for maintaining the tertiary structure of proteins in harsh environments, such as extreme pH or temperature?

<p>Hydrophobic interactions (C)</p> Signup and view all the answers

What is the key difference between Fischer projections and Haworth structures of carbohydrates?

<p>Orientation of hydroxyl groups (B)</p> Signup and view all the answers

What is the purpose of DNA replication?

<p>To create a copy of DNA for cell division (D)</p> Signup and view all the answers

Which enzyme is primarily responsible for DNA transcription?

<p>RNA polymerase (C)</p> Signup and view all the answers

What is the purpose of 5' capping in RNA processing?

<p>To stabilize the 5' end of the RNA (C)</p> Signup and view all the answers

What is the role of the initiator tRNA in RNA translation?

<p>To bring the first amino acid to the ribosome (C)</p> Signup and view all the answers

What is the role of the peptidyl transferase in RNA translation?

<p>To form the peptide bond between amino acids (D)</p> Signup and view all the answers

What is the role of signal peptides in post-translational modifications?

<p>To direct the protein to the correct organelle (A)</p> Signup and view all the answers

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