5 1 all organisms are composed of cells n.
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5.1 All organisms are composed of cells. 3 main features: plasma membrane nucleus or nucleoid cytoplasm. amoeba. neuron. sperm & egg. skeletal muscle. The plasma membrane surrounds all cells. bilayer fluid mosaic Singer, Nicolson 1972. Genetic Information. DNA.

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5 1 all organisms are composed of cells
5.1 All organisms are composed of cells

3 main features:

plasma membrane

nucleus or nucleoid

cytoplasm

amoeba

neuron

sperm & egg

skeletal muscle

the plasma membrane surrounds all cells
The plasma membrane surrounds all cells

bilayer

fluid

mosaic

Singer, Nicolson 1972

genetic information
Genetic Information

DNA

eukaryotes

Nucleus

chromosome

during cell division

nucleoid

prokaryotes

plasmids

cell theory
Cell Theory

Cells are the unit of

structure and function

Cells reproduce

cells

why are cells small
Why are cells small?

The membrane (surface) must allow for sufficient

& rapid exchange to support the cell contents

As an object increases

in size its volume

increases as the

cube (x3)of its diameter

while

surface areaincreases

as the square (y2)

25

25

25

prokaryotic vs eukaryotic
Prokaryotic vs Eukaryotic

Features in

common

Unique to

eukaryotes,

organelles

allow for

division

of labor

large & complex

organelles, chromosomes

cytoskeleton

1.5bya

small & simple

ribosomes, nucleoid

peptidoglycan wall

3.5bya

slide7

Prokaryotes:

so what?

Decomposition nutrition

disease sewage treatment digestion

soil contamination clean up

nutrient recycling symbiosis normal flora

Energy transformers history of life

genetic engineering human health

slide8

6.1 The plasma membrane is built of

PRIMARILY OF PHOSPHOLIPIDS

Charged phosphate creates a polar ‘head’

H-C tails are hydrophobic

slide9

In solution, phospholipid molecules arrange with tails away from water (in cytoplasm and in the environment) and towards each other

A barrier to

charged ions

and polar molecules

slide11

6.2 Membrane protein types/functions

move molecules across

membrane stability

facilitate rxns

i.e. channels

carriers, porins

membrane stability

relay information

in/out of cell

Also: markers on cell surface