Biology: Biomolecules and Cell Structure

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Questions and Answers

Which type of bond is NOT correctly paired with the class of biomolecule in which it is primarily found?

  • Hydrogen bond – Nucleic acids (correct)
  • Glycosidic linkage – Carbohydrates
  • Peptide bond – Proteins
  • Ester linkage – Lipids

The sequence of amino acids determines the primary structure of a protein.

True (A)

What are the three components of the cell theory?

All living organisms are composed of one or more cells; the cell is the basic unit of structure and organization in organisms; cells arise from pre-existing cells.

The process by which monomers are linked together to form polymers is called a ______ reaction, which involves the removal of a water molecule.

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

Which of the following is NOT a component of the cytoskeleton?

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

Prokaryotic cells contain membrane-bound organelles.

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

What is the significance of the extracellular matrix (ECM) in animal cells?

<p>The ECM provides structural support, adhesion, movement, and regulation for animal cells.</p> Signup and view all the answers

According to the endosymbiont theory, ______ and chloroplasts originated from prokaryotic cells that were engulfed by a host cell.

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

Which of the following is a key difference between DNA and RNA?

<p>DNA uses thymine as a base, while RNA uses uracil. (B)</p> Signup and view all the answers

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Flashcards

Macromolecules

Large polymers built from small subunit monomers.

Dehydration Reaction

Reaction that builds polymers by removing a water molecule.

Hydrolysis

Reaction that breaks down polymers by adding a water molecule.

Carbohydrate Monomer/Polymer

Monosaccharides (sugars). Polymer is Polysaccharides. Bond is Glycosidic Linkage

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Lipid Monomer/Polymer

Glycerol and fatty acids. Polymer is Triglycerides. Bond is Ester Linkage.

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Protein Monomer/Polymer

Amino acids. Polymer is Polypeptides. Bond is Peptide Bond.

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Nucleic Acid Monomer/Polymer

Nucleotides. Polymer is DNA and RNA. Bond is Phosphodiester Bond.

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Primary Structure

Level of protein structure: Sequence of amino acids.

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Cell Theory

Cell theory states all living things are composed of cells.

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Prokaryotic vs. Eukaryotic

Prokaryotic cells lack a nucleus; eukaryotic cells have a nucleus.

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Study Notes

  • Chapter 5 focuses on the structure and function of large biological molecules (biomolecules).
  • Chapter 6 tours the cell.

Macromolecules

  • Macromolecules are large polymers.
  • They are assembled from smaller subunits known as monomers.

Polymer Formation and Breakdown

  • Polymers are built through dehydration reactions, which remove a water molecule.
  • Polymers are disassembled by hydrolysis, which adds a water molecule.

Major Biomolecule Classes

  • The major classes of biomolecules include: carbohydrates, lipids, proteins, and nucleic acids.

Carbohydrates

  • A glycosidic linkage is the bond formed in carbohydrates.

Lipids

  • An ester linkage is the bond formed in lipids.

Proteins

  • A peptide bond is the bond formed in proteins.
  • Amino acids can be nonpolar, polar, acidic, or basic, depending on their side chains.
  • Protein structures have four levels: primary, secondary, tertiary, and quaternary.
  • Denaturation can occur in proteins under certain conditions.

Nucleic Acids

  • A phosphodiester bond is the bond in nucleic acids.
  • Nucleotides have purine and pyrimidine bases.
  • RNA and DNA molecules differ in structure and function.

Cell Theory

  • Cell theory serves as a central principle in biology.

Cell Structures

  • Prokaryotic and eukaryotic cells differ in structure.
  • Eukaryotic cells contain membrane-bound organelles with specific functions.

Endosymbiont Theory

  • The endosymbiont theory explains the origin of mitochondria and chloroplasts in eukaryotic cells.

Cytoskeleton

  • The cytoskeleton is composed of various components.
  • These components have key roles in cell structure and function.

The Extracellular Matrix

  • The extracellular matrix is a key component for animal cells.

Plant vs Animal Cells

  • Plant and animal cells have key differences.

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