Chapter 3 - Easy level - Cellular Metabolism and Biochemical Reactions Quiz
64 Questions
4 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the primary source of metabolic energy for all cells?

  • Glucose
  • Glycogen
  • ATP (correct)
  • NADH

    • What process involves breaking down glucose to pyruvate, yielding ATP and NADH?

  • Beta-oxidation
  • Gluconeogenesis
  • Glycolysis (correct)
  • Krebs cycle

    • Which law of thermodynamics determines the direction of chemical reactions?

  • Second law (correct)
  • First law
  • Zeroth law
  • Third law

    • What is responsible for the synthesis of major cell constituents including carbohydrates, lipids, proteins, and nucleic acids?

    <p>Metabolic network</p> Signup and view all the answers

    Where does fatty acid synthesis primarily occur?

    <p>Cytosol of cells</p> Signup and view all the answers

    What is the precursor for both purine and pyrimidine nucleotide synthesis?

    <p>Ribose-5-phosphate</p> Signup and view all the answers

    What process converts atmospheric nitrogen (N2) into ammonia (NH3)?

    <p>Nitrogen fixation</p> Signup and view all the answers

    What is the end product of glycolysis?

    <p>Pyruvate</p> Signup and view all the answers

    What drives the formation of peptide bonds during protein synthesis?

    <p>Condensation of ATP</p> Signup and view all the answers

    How do antimetabolites like 6-mercaptopurine work?

    <p>Inhibiting nucleic acid synthesis</p> Signup and view all the answers

    What does Rubisco catalyze in the Calvin cycle?

    <p>Conversion of CO2 to 3-phosphoglycerate</p> Signup and view all the answers

    From which citric acid cycle intermediate is glutamate directly synthesized?

    <p>α-ketoglutarate</p> Signup and view all the answers

    What is the final electron acceptor in the mitochondrial electron transport chain?

    <p>Oxygen</p> Signup and view all the answers

    In what form is glucose stored in animal cells?

    <p>Glycogen</p> Signup and view all the answers

    Where does fatty acid synthesis primarily occur in eukaryotic cells?

    <p>Cytosol</p> Signup and view all the answers

    What acts as the final electron acceptor in the light reactions of photosynthesis?

    <p>NADP+</p> Signup and view all the answers

    What is the activated form of glucose used in the synthesis of polysaccharides?

    <p>UDP-glucose</p> Signup and view all the answers

    What is the major product of fatty acid synthesis in eukaryotic cells?

    <p>Palmitate</p> Signup and view all the answers

    What is the starting point for nucleotide biosynthesis (both pyrimidine and purine)?

    <p>Ribose-5-phosphate</p> Signup and view all the answers

    What is the primary CO$_2$ acceptor in the Calvin cycle, facilitating CO$_2$ fixation?

    <p>Ribulose-1,5-bisphosphate (RuBP)</p> Signup and view all the answers

    How do antimetabolites like 6-mercaptopurine work?

    <p>Inhibiting nucleic acid synthesis</p> Signup and view all the answers

    What is the primary source of carbon skeletons for amino acids?

    <p>Intermediates in glycolysis and the citric acid cycle</p> Signup and view all the answers

    What is primarily incorporated as nitrogen in protein biosynthesis?

    <p>Ammonia</p> Signup and view all the answers

    What drives ATP synthesis by ATP synthase in mitochondria?

    <p>Proton gradient</p> Signup and view all the answers

    What is the driving force for electron transport through photosystem II in photosynthesis?

    <p>Generation of a proton gradient</p> Signup and view all the answers

    What regulates the activity of Aspartate Transcarbamoylase (ATC)?

    <p>UTP concentration</p> Signup and view all the answers

    What is required for the conversion of pyruvate to glucose in gluconeogenesis?

    <p>4 ATP, 2 GTP, 2 NADH</p> Signup and view all the answers

    What is the activated form of glucose used in the synthesis of polysaccharides?

    <p>UDP-glucose</p> Signup and view all the answers

    What is the primary function of Photosystem II in photosynthesis?

    <p>To generate a proton gradient for ATP synthesis</p> Signup and view all the answers

    What is responsible for catalyzing the addition of nucleotides during DNA synthesis?

    <p>DNA polymerase</p> Signup and view all the answers

    What is the end product of glycolysis?

    <p>Pyruvate</p> Signup and view all the answers

    What drives the formation of peptide bonds during protein synthesis?

    <p>Hydrolysis of two GTP molecules</p> Signup and view all the answers

    What is the precursor for both purine and pyrimidine nucleotide synthesis?

    <p>PRPP (5-phosphoribosyl-1-pyrophosphate)</p> Signup and view all the answers

    What is the conversion of atmospheric nitrogen (N2) to ammonia (NH3) called?

    <p>Nitrogen fixation</p> Signup and view all the answers

    What is the effectiveness of 6-mercaptopurine in cancer treatment attributed to?

    <p>Its ability to inhibit nucleic acid synthesis</p> Signup and view all the answers

    What is the regeneration of Ribulose-1,5-bisphosphate (RuBP) in the Calvin cycle dependent on?

    <p>ATP only</p> Signup and view all the answers

    What is required for the synthesis of the non-essential amino acid alanine from pyruvate?

    <p>Amination, the addition of an amino group</p> Signup and view all the answers

    What is the role of Phosphofructokinase in glycolysis?

    <p>Conversion of fructose-6-phosphate to fructose-1,6-bisphosphate</p> Signup and view all the answers

    What is the activated glucose intermediate formed in polysaccharide synthesis?

    <p>UDP-glucose</p> Signup and view all the answers

    What is required for the addition of each two-carbon unit in the biosynthesis of fatty acids?

    <p>Two molecules of NADPH</p> Signup and view all the answers

    What is the primary molecule used by cells as a source of metabolic energy?

    <p>ATP</p> Signup and view all the answers

    How many ATP molecules are produced per molecule of glucose in glycolysis?

    <p>2</p> Signup and view all the answers

    What does the first law of thermodynamics in biological systems exemplify?

    <p>Conversion of chemical energy to mechanical energy</p> Signup and view all the answers

    What does chemiosmotic coupling in cellular respiration describe?

    <p>Generation of ATP through proton gradients</p> Signup and view all the answers

    What does Gibbs free energy in biological systems predict?

    <p>Direction of biochemical reactions</p> Signup and view all the answers

    What is the primary outcome of the citric acid cycle in cellular metabolism?

    <p>Production of ATP, NADH, and FADH2</p> Signup and view all the answers

    What is the process of ATP generation via proton gradients across membranes called?

    <p>Chemiosmotic coupling</p> Signup and view all the answers

    What is the process in which plants convert light energy into chemical energy through biochemical reactions involving light absorption, electron transport, and ATP generation?

    <p>Photosynthesis</p> Signup and view all the answers

    What is the final electron acceptor in the electron transport chain during aerobic respiration?

    <p>Oxygen</p> Signup and view all the answers

    What does the biosynthesis of cell constituents include?

    <p>Protein and amino acid synthesis, nucleic acid synthesis pathways</p> Signup and view all the answers

    What is the process that converts light energy into chemical energy in plants?

    <p>Photosynthesis</p> Signup and view all the answers

    What is involved in gluconeogenesis?

    <p>Synthesizing glucose from amino acids and glycerol</p> Signup and view all the answers

    What is the primary molecule used by cells as a source of metabolic energy?

    <p>ATP</p> Signup and view all the answers

    How many ATP molecules are produced per molecule of glucose in glycolysis?

    <p>2</p> Signup and view all the answers

    What is the primary outcome of the citric acid cycle in cellular metabolism?

    <p>Production of ATP, NADH, and FADH2</p> Signup and view all the answers

    What does the chemiosmotic coupling in cellular respiration describe?

    <p>Generation of ATP through proton gradients</p> Signup and view all the answers

    What process does photosynthesis involve?

    <p>Conversion of light energy into chemical energy</p> Signup and view all the answers

    What is involved in the biosynthesis of cell constituents?

    <p>Nucleic acid synthesis pathways</p> Signup and view all the answers

    What is the final electron acceptor in the electron transport chain during aerobic respiration?

    <p>Oxygen</p> Signup and view all the answers

    What does the first law of thermodynamics in biological systems exemplify?

    <p>Conversion of chemical energy to mechanical energy</p> Signup and view all the answers

    What does Gibbs free energy in biological systems predict?

    <p>Direction of biochemical reactions</p> Signup and view all the answers

    What is the process of ATP generation via proton gradients across membranes known as?

    <p>Chemiosmotic coupling</p> Signup and view all the answers

    What is the role of oxygen in the electron transport chain during aerobic respiration?

    <p>Generation of water as a byproduct</p> Signup and view all the answers

    What is involved in the process of photosynthesis in plants?

    <p>Conversion of light energy into chemical energy</p> Signup and view all the answers

    Study Notes

    Biochemistry Review Questions and Answers

    • Ribose-5-phosphate serves as the precursor for both purine and pyrimidine nucleotide synthesis, providing the sugar component of the nucleotides.
    • Nitrogen fixation is the process that converts atmospheric nitrogen (N2) into ammonia (NH3), which can then be incorporated into organic compounds.
    • Fatty acid synthesis primarily occurs in the cytosol of cells.
    • The formation of peptide bonds during protein synthesis is energetically driven by the hydrolysis of GTP.
    • Antimetabolites like 6-mercaptopurine work by inhibiting nucleic acid synthesis, thereby preventing cancer cell proliferation.
    • Pyruvate is the end product of glycolysis, while glucose-6-phosphate and fructose-1,6-bisphosphate are intermediates in glycolysis.
    • Rubisco catalyzes the conversion of CO2 to 3-phosphoglycerate in the Calvin cycle.
    • Glutamate is directly synthesized from the citric acid cycle intermediate α-ketoglutarate.
    • Oxygen is the final electron acceptor in the mitochondrial electron transport chain, forming water.
    • In animal cells, glucose is stored in the form of glycogen.
    • Fatty acid synthesis primarily occurs in the cytosol of eukaryotic cells, while NADP+ acts as the final electron acceptor in the light reactions of photosynthesis, where it is reduced to NADPH.

    Biochemistry Review Questions

    • Glycolysis involves the conversion of fructose-6-phosphate to fructose-1,6-bisphosphate, catalyzed by Phosphofructokinase.
    • Nitrogen fixation is the conversion of atmospheric nitrogen (N2) to ammonia (NH3) in the nitrogen cycle.
    • Protein synthesis is driven by the hydrolysis of two GTP molecules for the addition of each amino acid to the growing polypeptide chain.
    • The carbon and nitrogen atoms of the purine ring in purine nucleotides are derived from both glucose and amino acids.
    • The regeneration of Ribulose-1,5-bisphosphate (RuBP) in the Calvin cycle requires ATP only.
    • DNA polymerase is responsible for catalyzing the addition of nucleotides during DNA synthesis.
    • 6-mercaptopurine's effectiveness in cancer treatment is due to its ability to inhibit nucleic acid synthesis.
    • The synthesis of the non-essential amino acid alanine from pyruvate requires amination, the addition of an amino group.
    • Photosystem II's primary function in photosynthesis is to generate a proton gradient for ATP synthesis.
    • The conversion of two molecules of pyruvate to one molecule of glucose in gluconeogenesis requires 6 ATP molecules.
    • In polysaccharide synthesis, glucose-1-phosphate reacts with UTP to form UDP-glucose, an activated glucose intermediate.
    • In the biosynthesis of fatty acids, the addition of each two-carbon unit requires two molecules of NADPH.

    Cellular Metabolism and Biochemical Reactions Overview

    • Chemiosmotic coupling is the process of ATP generation via proton gradients across membranes, proposed by Peter Mitchell.
    • Photosynthesis is the process in which plants convert light energy into chemical energy through biochemical reactions involving light absorption, electron transport, and ATP generation.
    • The biosynthesis of cell constituents includes gluconeogenesis, glycolysis, lipid synthesis, protein and amino acid synthesis, and nucleic acid synthesis pathways.
    • Key experiments related to cellular metabolism cover the chemiosmotic theory, antimetabolites in cancer therapy, and biological aspects and treatment approaches for AIDS.
    • ATP is the primary molecule used by cells as a source of metabolic energy, distinguishing it from glucose, NADH, and pyruvate.
    • Glycolysis produces a net gain of 2 ATP molecules per molecule of glucose, not 4, 8, or 36.
    • The first law of thermodynamics in biological systems exemplifies the conversion of chemical energy to mechanical energy.
    • Chemiosmotic coupling in cellular respiration describes the generation of ATP through proton gradients, not direct ATP synthesis from glucose, electron transfer, or glucose breakdown.
    • Gibbs free energy in biological systems predicts the direction of biochemical reactions, not the rate of enzymatic reactions, entropy change, or total energy.
    • The primary outcome of the citric acid cycle in cellular metabolism is the production of ATP, NADH, and FADH2, not the synthesis of glucose, conversion of ATP to ADP, or breakdown of amino acids.
    • Photosynthesis is the process that converts light energy into chemical energy in plants, not glycolysis, oxidative phosphorylation, or the Krebs cycle.
    • Gluconeogenesis involves synthesizing glucose from amino acids and glycerol, not fatty acids.
    • Oxygen is the final electron acceptor in the electron transport chain during aerobic respiration, crucial for the generation of water as a byproduct and the continuation of the electron transport chain.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Test your knowledge of cellular metabolism and biochemical reactions with this quiz. Explore topics such as chemiosmotic coupling, photosynthesis, biosynthesis of cell constituents, key experiments, ATP as a source of metabolic energy, glycolysis, thermodynamics in biological systems, cellular respiration, Gibbs free energy, and the citric acid cycle. This quiz will challenge your understanding of fundamental concepts in cellular metabolism and biochemistry.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser