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Biology 1B > Membrane Structure And Function > Flashcards

Flashcards in Membrane Structure And Function Deck (17):
1

What are membranes?

Membranes are phospholipid polymers or fatty acids, glycerol, phosphorus and a terminal amine group.

2

Membrane phospholipids are amphipathic molecules, what does this mean?

They are both hydrophilic and hydrophobic

3

Give four functions of cellular membranes

Compartmentalise metabolic activities
Separate/protect cellular components
Provide scaffolding for signalling
A medium for cellular energy generation

4

Membranes are a barrier to diffusion, true or false?

True

5

Proteins usually carry an excess of what charge?

Negative

6

What can diffusion across semi-permeable membranes generate?

A small imbalance in ion concentration

7

When does a membrane voltage occur?

When immobile charges are not balanced or when charge transport is not fully balanced.

8

What is diffusion of ions driven by?

Both electrical and chemical gradients

9

What equation describes the equilibrium between chemical and electrical forces on a charged molecule?

The Nernst equation

10

How can we measure voltage across cell membranes?

Using microelectrodes implanted in the cells.

11

How can we measure voltage across other membranes?

Voltage sensitive dyes

12

What is a cell's mean diffusion time?

<0.1s

13

Where are membranes found?

De limiting all organelles in a eukaryotic cell

14

How are membranes maintained?

Membrane lipid synthesis - vesicles traffic through the Golgi - membrane and cargo delivery/recovery by endocytosis and exocytosis

15

What does GFP stand for?

Green fluorescent protein

16

What animal includes genes for intrinsically fluorescent proteins?

Aquoria Victoria (Jellyfish)

17

Give two features of the endoplasmic reticulum

Highly mobile
The endoplasmic reticulum space is interconnected