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Vince Licata - BIOL 1201: Chapter 6, 7, 8, 9 Questions and Answers 100% Pass £11.29
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Vince Licata - BIOL 1201: Chapter 6, 7, 8, 9 Questions and Answers 100% Pass
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Vince Licata - BIOL 1201: Chapter 6, 7, 8, 9 Questions and Answers 100% Pass Phospholipid Bilayer - ANSWER -- Hydrophilic Head - Hydrophobic tail - Semi-permeable bilayer - A self arranging structure: if you put a bunch of phospholipids into a beaker, they will form a bilayer! ( and a few oth...

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  • December 17, 2024
  • 39
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • vince licata biol 1201 chapter 6 7 8 9 quest

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  • LSU Biol 1201
  • LSU Biol 1201

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Vince Licata - BIOL 1201: Chapter 6, 7,
8, 9 Questions and Answers 100% Pass

Phospholipid Bilayer - ANSWER ✔✔-- Hydrophilic Head


- Hydrophobic tail


- Semi-permeable bilayer


- A self arranging structure: if you put a bunch of phospholipids into a beaker, they will form a bilayer! (

and a few other smaller structures)


-If you threw phospholipids on a lake, they will form a layer a MOLECULEEEE thick with the

hydrophobic tails sticking up and the hydrophilic heads in the water - Spontaneously!


The Fluid Mosaic Model - ANSWER ✔✔-- Proposed by Singer and Nicholson


- Awarded the Nobel Peace Prize for it


- Then proved wrong


- Their model showed the proteins just floating around like potatoes, they actually generally stay exactly

where they are, and for a reason!


Membrane fluidity - ANSWER ✔✔-- Lipids change the fluidity of a membrane.


- Lipids drift laterally non-stop


- Rarely flip-flops


-Membranes must be fluid to work properly: they are usually about as fluid as salad oil!




Created by ©EmilyCharlene 2025. All rights reserved.

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Two ways to control the membrane's fluidity - ANSWER ✔✔-- Higher temperature: More fluid


-More Unsaturated fatty acids: more fluid ( these are the kinky lipids, they have more space between

them)


- More saturated fatty acids: less fluid ( the tails are straighter~more tightly packed)


The Fluidity of Cholesterol! - ANSWER ✔✔-- At higher temp (>37C) -> less fluidity


- Lower temp (<37C) -> More fluidity


The two major classes of proteins based on position: - ANSWER ✔✔-- Peripheral proteins: bound

(attached) to one half of the lipid bilayer


- Integral protein: is bound to both half of the lipid bilayer.


Six major classes of proteins based on function - ANSWER ✔✔-1) Transport


2) Enzymatic Activity


3) Signal Transduction


4) Cell-cell recognition


5) Intercellular Joining


6) Attachment to the cytoskeleton and extracellular matrix (ECM)


How do cells recognize each other? - ANSWER ✔✔-By binding to surface membrane molecules (often

containing carbohydrates)


Plasma membranes are selectively ______________ - ANSWER ✔✔-permeable.


Hydrophobic (nonpolar) molecules pass through the membrane




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Polar molecules, such as sugars, do/can not cross the membrane easily.


How do you get things across a membrane? - ANSWER ✔✔-- Passive Transport


- Active Transport


Passive Transport - ANSWER ✔✔-- Diffusion acroos a membrane


- No energy is expended by the cells to make it happen


Substances diffuse down their _____________ _______________, from __________ to _______

concentration - ANSWER ✔✔-Concentration gradient, from high to low concentration


Diffusion - ANSWER ✔✔-Any solute going across a membrane


Hydrophobic


Osmosis - ANSWER ✔✔-The direction that the water is going across a selectively


permeable


membrane


Water is always moving from the highest concentration to the lowest concentration


What diffuses across a membrane if it is? - ANSWER ✔✔-Water diffuses across a membrane from the

lower solute concentration toward higher solute concentration until the solute concentration is equal.


Isotonic - ANSWER ✔✔-Solute concentration is the same as that inside the cell; no net movement across

the plasma membrane


Hypertonic - ANSWER ✔✔-Solute concentration is greater than inside the cell; cell loses water


Hypotonic - ANSWER ✔✔-Solute concentration is less than that inside the cell; cell gains water


Osmoregulation - ANSWER ✔✔-The cellular control of internal solute concentrations and water balance




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Transport proteins: 3 major types - ANSWER ✔✔-Helping molecules down their concentration gradient:

passive transport - facilitated diffusion


-Channel


proteins


-Carrier


proteins


-Help ions up (against) their concentration gradient


- ion pumps


Channel proteins - ANSWER ✔✔-They open up a channel in the membrane. They have a cylinder down

the middle of them, letting things just flow through the membrane from higher concentrations to lower

concentrations.


Most efficient of the transport proteins - hundreds of thousands of molecules can just flow through until

it closes!




Considered passive transport


Highly selective


Carrier Proteins - ANSWER ✔✔-Open on one side of the membrane, capture a few molecules, close, and

open on the other side of the membrane and release them


Not that efficient - can only take a few molecules at a time




Considered passive transport



Created by ©EmilyCharlene 2025. All rights reserved.

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