Properties of Carbon Nanofibers, Water Strider, and Cell Chemistry

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

Double-layered phospholipid bilayer

In cell chemistry, what process involves the synthesis of molecules from amino acids?

Polymerization

Why is carbon referred to as the 'King of All Elements' in biological molecules?

It is present in DNA, proteins, and fats

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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