Unicellular Organisms

Lets Start With Cells

• Anyone remember what cells are?• How about all those organelles that they

have?• …maybe we should review

The Mighty Cell

• These tiny, microscopic things are pretty complex

• They need to be able to carry out all the life processes that we do, but on a microscopic level!

The Mighty Cell

• Cells have specialized parts that carry out life functions in the same way that our organs do for us

• We call them…organelles!

• Its similar to our brain

• Regulates and controls all of the happenings inside of the cell

• Contains the DNA

The goo: Cytoplasm

• This is the goo that everything is suspended in• If things need to get transported, it goes

through the cytoplasm (Similar to our blood)

The Barrier; Cell Membrane

• Keeps the insides in and the outsides out• Similar function as our skin

The Structure; Cell wall• Similar to the membrane, except it is very

rigid and gives it a definite shape• Our skeletal system does kind of the same

thing• Cell wall also keeps insides in and outsides

out

The Food Factory; Chloroplast

• Not all cells have this• Uses energy from the sun and CO2 to make

food!• How awesome would it be if we had

chloroplasts in our skin?...Think about it…

The Packaging System: Endoplasmic Reticulum

• Can create proteins and gets them all ready to go where they need to be

• Surrounds the nucleus

The Assembly Worker: Ribosomes

• They make proteins• Proteins are essential for all life, with out

them we wouldn’t be here…

The Power House; Mitochondria

• Converts food into ENERGY!!

• ‘The Mighty Mitochondria’

• Kind of the opposite of the chloroplast

The Storage: Vacuole

• Acts as a storage place. Can store food or other materials

The Post Office; Golgi Apparatus

• Packages and labels materials for shipment

The Stomach; Lysosome

• Contains Digestive juices that will break down food

Ok, now that we know about cells…

• Lets talk about some single celled organisms!!

Unicellular Organisms

Bacteria DinoflagellatesDiatoms

Bacteria

• Lack a nucleus and other organelles!! OMG THEIR SO SIMPLE!

• 3 different shapes– Rod, spiral and round

• Reproduce Rapidly!

Bacteria Are Important

• Decay Bacteria– Feed on dead things– Recycles nutrients back to the environment– Lots of them found at the bottom of the ocean

Bacteria Are Important

• Blue-Green (Cyano)Bacteria– Important Producers– Maybe the first photosynthetic organisms EVER!– Can produce Reef-like structures called

stromatolites!

Diatoms• Float near the surface

usually (that’s where the light is after all!)

• Important marine producers

• Come in a wide variety of shapes

Diatoms

• Has a nucleus and other organelles

• Transparent cell wall lets light in

• Has 2 frustules that fit together• Spines and oil filled vacuoles

help keep the diatoms floating near the surface

Dinoflagellates

• Quite Different! They can MOVE!!– They have 2 flagella that help them do this

• An eye spot helps them move towards the light

• Some are also bioluminescent

Dinoflagellates

• They are photosynthetic, but they can also eat food!

• When a lot of them bloom they can cause red tides which can be dangerous for people and wild life

Photosynthesis

Microscope Review

• Scanning (red), focus with big knob• Low power (yellow), focus with big knob or

small knob• High power; SMALL KNOB ONLY!

Stations

• Groups of 5 will rotate from station to station• 1 station is for prepping a slide to look at

(pondwater)• You will have 4 minutes for each station• You will sketch what you see on a sheet

resembling this;

Diamtoms Dinoflagellates

Blue-green bacteria Pond water Critter

Ticket Out;

• Create a Concept map for the next chapter (5)• Include all the major topics and subtopics in

the map• Homework: – Read the next chapter and take notes– Use connecting words/phrases on your concept

map for each connection