Related Essays

  • Beta Vulgaris Lab Report

    INTRODUCTION A membrane of the cell is the defensive wall that protects, controls and regulate the amount of ions and water that enter and exit it. While so...

  • Cell Transportation Lab

    The purpose of Activity 1 of this lab is to understand how cell transportation works, The purpose of the second part is to explore semipermeable membranes. T...

  • Biology: Cell Theory

    Some are only attached to the inner or outer layer of the membrane while the transmembrane proteins pass through the entire structure. The transmembrane prot...

  • Factors Affecting The Permeability Of A Cell Membrane

    Introduction The cell membrane provides a boundary between the intracellular environment and the extracellular environment. The membrane is selectively perm...

  • Water And Osmosis Experiment

    Large molecules such as sugars or fats, and charged molecules such as sodium ions or chlorine ions cannot pass through the membrane, but

  • Endocytosis And Osmosis

    The cell has several different ways that it allows molecules and ions to cross its membrane, including bulk transport, osmosis, passive transport, and active...

  • Functions, Role, And Structure Of A Cell Membrane

    Lipids, made up of glycerol, two fatty acid tails, and a phosphate- linked head group, are used to make a barrier between the cell and its environment. Phosp...

  • The Pros And Cons Of Nerve Cells

    The cell membrane is composed of fatty acids and protein channels (some voltage gated and other selectively permeable) that monitor the diffusion of ions

  • Robert Hook's Structural Variation Of Cell Theory

    Due to the membrane being semi permeable, necessary molecules such as water, oxygen, glucose and urea can enter or leave the cell by different processes such...

  • Similarities And Differences Between Prokaryotic And Eukaryotic Cells

    Also within the cell membrane there are proteins, there a few proteins such as the glycoproteins, these are involved in cell recognition and cell attachment...

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

Card Range To Study

through

image

Play button

image

Play button

image

Progress

1/6

Click to flip

Use LEFT and RIGHT arrow keys to navigate between flashcards;

Use UP and DOWN arrow keys to flip the card;

H to show hint;

A reads text to speech;

6 Cards in this Set

  • Front
  • Back
  • 3rd side (hint)
Why are cell membranes asymmetrical?
The "inside" and "outside" faces are different. Outside has molecules such as phosphatidylcholine, sphingomyelin, sugars, cholesterol. The inside, townard the cytosol, has phosphatidyl-serine, -inositol, -ethaolamine, cholesteroll. Proteins placed sometimes at random
inside vs outside
What is the cell cortex and what is its function?
Network of actin filaments & associated proteins. Functions as support for the plasma membrane. Spectrin in the cortex cross-links membrane proteins
& provides strength.
support
Why is it crucial for cell membranes to maintain different internal and external ion concentrations?
Ion channels: ions move down electrochemical gradient. the tendency of an electrically charged solute, such as K+, to move across the membrane is decided by the difference in ion concentrations on either side of membrane. Necessary for passive transport.
sort of passive transport
What are cell membranes permeable to?
Hydrophobic molecules (steroid hormones, O2, CO2) & Small polar molecules (EtOH >> H2O)
Because membranes contain protein channels for ions
What are cell membranes impermeable to?
Large polar molecules (glucose),
Ions/charged molecules (H+, Na+, ATP, amino acids)
Describe the different types of proteins used to transport molecules across cell membranes.
Specific, Saturable, Inhibitable.

Uniport, Symbiport, Antiport