Properties of Carbon Nanofibers, Water Strider, and Cell Chemistry
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Questions and Answers

What type of structure does the selectively permeable membrane consist of?

  • No layer structure
  • Triple-layered phospholipid bilayer
  • Single-layered phospholipid bilayer
  • Double-layered phospholipid bilayer (correct)
  • In cell chemistry, what process involves the synthesis of molecules from amino acids?

  • Carbon assembly
  • Self-assembly
  • Polymerization (correct)
  • Water synthesis
  • Why is carbon referred to as the 'King of All Elements' in biological molecules?

  • It is found in water and air
  • It is present in DNA, proteins, and fats (correct)
  • It can replace all other elements
  • It is the most reactive element
  • What characteristic of water allows it to form a layer or film on surfaces like a Water Strider?

    <p>Surface tension</p> Signup and view all the answers

    Which principle of Cell Chemistry involves molecules having internal memory to reassemble?

    <p>Self-assembly</p> Signup and view all the answers

    What property of water allows it to form spheres of hydration around ions?

    <p>Hydrogen bonding</p> Signup and view all the answers

    Which term best describes hydrocarbons according to the text?

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

    What is the main function of a SEMI PERMEABLE MEMBRANE as described in the text?

    <p>Control the entry and exit of solutes</p> Signup and view all the answers

    Why is the amphipathic nature important in cell membranes?

    <p>To regulate the entry and exit of molecules</p> Signup and view all the answers

    What is responsible for the cohesive nature of water molecules?

    <p>Hydrogen bonding</p> Signup and view all the answers

    How does water contribute to dissolving a large variety of substances?

    <p>By virtue of its polarity</p> Signup and view all the answers

    Why do large uncharged polar molecules like glucose and sucrose pass through the membrane slowly?

    <p>They form spheres of hydration around them, impeding their movement</p> Signup and view all the answers

    What is the role of channel membrane proteins in the movement of solutes across a semi-permeable membrane?

    <p>They shield water away from the hydrophobic region, allowing faster movement of solutes</p> Signup and view all the answers

    Why is it stated as a blessing that small nonpolar molecules like O2 and CO2 don't need membrane proteins to pass through?

    <p>They are integral components of cellular respiration</p> Signup and view all the answers

    What is the significance of water being a major component of cells?

    <p>Water-based cells allow for various chemical reactions to occur</p> Signup and view all the answers

    Why do small uncharged polar molecules like H2O and ethanol move relatively quickly across a semi-permeable membrane?

    <p>Their small size allows them to move faster</p> Signup and view all the answers

    What is the main reason why ions like Cl-, K+, and Na+ cannot easily pass through a semi-permeable membrane?

    <p>Ions form hydration spheres around them, preventing passage</p> Signup and view all the answers

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