Cell Structure and Function

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Questions and Answers

What is the main function of ribosomes in a cell?

  • Energy generation through cellular respiration
  • Protein synthesis (correct)
  • Digestion of cellular waste
  • Protein modification and transport

Which biomolecule is composed of amino acid building blocks?

  • Proteins (correct)
  • Lipids
  • Nucleic acids
  • Carbohydrates

What is the term for the breakdown of molecules in cellular processes?

  • Photosynthesis
  • Metabolism
  • Catabolism (correct)
  • Anabolism

Which type of cell lacks a nucleus?

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

What is the process by which cells make their own food from sunlight?

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

What is the term for the 'building blocks of life'?

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

Which organelle is responsible for generating energy for the cell through cellular respiration?

<p>Mitochondria (D)</p> Signup and view all the answers

What is the term for the process by which an organism's genetic information is passed from one generation to the next?

<p>Genetics (D)</p> Signup and view all the answers

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Study Notes

Cells

  • Basic structural and functional units of life
  • Consist of:
    • Cell membrane (plasma membrane)
    • Cytoplasm
    • Genetic material (DNA or RNA)
  • Cell types:
    • Prokaryotic cells (no nucleus)
    • Eukaryotic cells (nucleus present)

Cellular Organelles

  • Mitochondria: generate energy for the cell through cellular respiration
  • Endoplasmic reticulum (ER): involved in protein synthesis and transport
  • Ribosomes: site of protein synthesis
  • Lysosomes: contain digestive enzymes for breaking down cellular waste
  • Golgi apparatus: involved in protein modification and transport

Biomolecules

  • Carbohydrates:
    • Monosaccharides (e.g. glucose)
    • Polysaccharides (e.g. starch, cellulose)
  • Proteins:
    • Amino acid building blocks
    • Primary, secondary, tertiary, and quaternary structures
  • Lipids:
    • Fats and oils
    • Phospholipids (component of cell membranes)
  • Nucleic acids:
    • DNA (deoxyribonucleic acid)
    • RNA (ribonucleic acid)

Cellular Processes

  • Metabolism:
    • Catabolism (breakdown of molecules)
    • Anabolism (synthesis of molecules)
  • Photosynthesis:
    • Light-dependent reactions
    • Light-independent reactions (Calvin cycle)
  • Cellular respiration:
    • Aerobic respiration (oxygen present)
    • Anaerobic respiration (oxygen absent)

Genetics

  • Mendelian genetics:
    • Laws of inheritance (segregation, independent assortment, dominance)
    • Punnett squares
  • DNA replication:
    • Semi-conservative model
    • Leading and lagging strands
  • Gene expression:
    • Transcription (DNA to RNA)
    • Translation (RNA to protein)

Evolution

  • Mechanisms of evolution:
    • Natural selection
    • Genetic drift
    • Mutation
    • Gene flow
  • Types of evolution:
    • Microevolution (within a population)
    • Macroevolution (between species)
  • Evidence for evolution:
    • Fossil record
    • Comparative anatomy
    • Molecular biology

Cells

  • Cells are the basic structural and functional units of life
  • Cell membrane (plasma membrane) regulates what enters and leaves the cell
  • Cytoplasm is a jelly-like substance inside the cell membrane where metabolic processes occur
  • Genetic material (DNA or RNA) contains instructions for cell growth and function
  • Prokaryotic cells lack a nucleus, while eukaryotic cells have a nucleus that stores genetic material

Cellular Organelles

  • Mitochondria are the site of cellular respiration, generating energy for the cell
  • Endoplasmic reticulum (ER) is involved in protein synthesis, transport, and storage
  • Ribosomes are responsible for protein synthesis, reading mRNA sequences
  • Lysosomes break down cellular waste and foreign substances using digestive enzymes
  • Golgi apparatus modifies and transports proteins and lipids

Biomolecules

  • Monosaccharides (e.g. glucose) are simple sugars, the building blocks of carbohydrates
  • Polysaccharides (e.g. starch, cellulose) are complex carbohydrates formed by monosaccharide bonds
  • Amino acids are the building blocks of proteins, which have primary, secondary, tertiary, and quaternary structures
  • Fats and oils are types of lipids, with phospholipids being a key component of cell membranes
  • DNA (deoxyribonucleic acid) and RNA (ribonucleic acid) are nucleic acids that store genetic information

Cellular Processes

  • Metabolism involves catabolism (breakdown of molecules) and anabolism (synthesis of molecules)
  • Photosynthesis occurs in two stages: light-dependent reactions and light-independent reactions (Calvin cycle)
  • Cellular respiration can occur aerobically (with oxygen) or anaerobically (without oxygen)

Genetics

  • Mendelian genetics explains how traits are inherited, following laws of segregation, independent assortment, and dominance
  • Punnett squares predict the probability of certain traits being passed down
  • DNA replication occurs semi-conservatively, with leading and lagging strands
  • Gene expression involves transcription (DNA to RNA) and translation (RNA to protein)

Evolution

  • Mechanisms of evolution include natural selection, genetic drift, mutation, and gene flow
  • Microevolution occurs within a population, while macroevolution occurs between species
  • Evidence for evolution is found in the fossil record, comparative anatomy, and molecular biology

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