Cell Biology Weekly Quiz 4
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Questions and Answers

Which of the following features are found in a molecule of ADP?

  • Three phosphates and Ribose
  • Ribose and a Nitrogenous base (correct)
  • Fatty acid tail and an Inorganic phosphate
  • Inorganic phosphate and a Nitrogenous base
  • Cholesterol...

  • is amphipathic and often concentrated in lipid rafts
  • is distributed evenly between the expolasmic and cytoplasmic leaflets
  • has four hydrocarbon rings
  • All of the above (correct)
  • Proteoglycans in the extracellular matrix trap water to form a gelatinous matrix.

    True

    Whit is it NOT feasible for silicon to be the fundamental atom in large biological molecules?

    <p>It is a large atom and therefore less stable</p> Signup and view all the answers

    Which of the following pairs shares a similar function? (Pick best similarity)

    <p>Plasmodesmata | Gap junctions</p> Signup and view all the answers

    Which of the following can be a component of the extracellular matrix?

    <p>All of the above</p> Signup and view all the answers

    Every protein in the cell is fully activated as soon as it has reached its tertiary, or sometimes quaternary, structure.

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

    You would expect that a newly discovered caspase (called Caspase-99) would be an integral membrane protein.

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

    Proteins involved in apoptotic paths in C. elegans are called "ced" proteins.

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

    In which situation does apoptosis occur?

    <p>All of the above</p> Signup and view all the answers

    Glycogen is hydrolyzed to form glucose monomers via endergonic reactions. These reactions have a positive delta G

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

    Nicotinamide adenine dinucleotide becomes reduced when it...

    <p>Gains a hydrogen atom and two electrons</p> Signup and view all the answers

    Study Notes

    ADP and Biological Molecules

    • ADP (Adenosine diphosphate) contains ribose sugar, two phosphate groups, and adenine.
    • Cholesterol is a lipid that maintains membrane fluidity but is not present in ADP.

    Extracellular Matrix

    • Proteoglycans in the extracellular matrix trap water, creating a gelatinous matrix that provides structural support.
    • Components of the extracellular matrix may include collagen, elastin, and fibronectin.

    Silicon in Biological Molecules

    • Silicon is not feasible as a fundamental atom in large biological molecules due to its limited ability to form complex, stable structures compared to carbon.

    Protein Activation

    • Proteins achieve full activation typically upon reaching tertiary or quaternary structure, although not all proteins may require this for functionality.
    • Newly discovered proteins, such as Caspase-99, are expected to have specific functions and structural characteristics.

    Apoptosis

    • Apoptosis, or programmed cell death, occurs in various conditions such as when cells are damaged, diseased, or no longer needed.
    • In C. elegans, proteins involved in apoptosis are designated as "ced" proteins.

    Glycogen Hydrolysis

    • Glycogen hydrolysis converts glycogen into glucose monomers, a process generally associated with exergonic reactions, not endergonic, due to the release of energy.

    Nicotinamide Adenine Dinucleotide (NAD+)

    • NAD+ becomes reduced to NADH when it accepts electrons during metabolic reactions, playing a crucial role in energy metabolism.

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    Description

    Test your knowledge on the features of a molecule of ADP by selecting the correct options from the choices provided.

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