Biology Discussion Notes Tuesday 11/25/2014

1.Be able to identify cell parts/proteins and describe their functions 2.Be able to say why cells have to be small. 3.Be able to describe the movement of particles and water in an environment and in a cell. 4.Be able to describe Hyper, Hypo, & Isotonic solutions Goal for the Day

Question of the Day 11/25 If a cell has a cell wall (like in _______, _________, _________, ___________, & some __________ does it still have a cell membrane? Explain your answer.

Skills Check TUESDAY Cell parts 1.Matching Cell parts/proteins & functions 2.Identifying what 5 cell parts could be found in all cells 3.Identifying whether cell parts belong in Prokaryotes, Eukaryotes, or Both 4.Identifying whether cell parts belong in Animals, Plants, or Both

Diffusion Cell’s rely on diffusion to pass materials, including nutrients and wastes in and out of their cells. Diffusion- movement of particles from high concentration to low concentration. –HIGH  LOW –GOAL IS TO REACH EQUILIBRIUM

Diffusion Diffusion- movement of particles from high concentration to low concentration. –HIGH  LOW Diffusion occurs through the random motion of particles (does not require energy)!

COLD vs Room Temp In which beaker are particles moving faster?

Diffusion Demonstration Predict what will happen to food coloring that is put into the flask. Describe what you think will happen, and why you think that will happen. ?

All cells are relatively…… Small Are there exceptions? Why are cells generally small? What limits cell size?

Cell Size Small cells function more efficiently than large cells – small cells can diffuse nutrients in & wastes out more quickly! This is due to a cell’s surface area to volume ratio Cells with a _____ surface Area/Volume ratio (more surface area/volume) more efficient

Cell Size Surface area – area of the cell membrane Volume – how much stuff can fit inside the membrane If a cell’s surface area–to-volume ratio is too low, substances cannot enter and leave the cell well enough to meet the cell’s needs.

Surface- Area to Volume Ratio Which has the higher surface area to volume ratio? In which one could you reach the middle the fastest?

Surface Area to Volume Ratio

Osmosis Osmosis - The diffusion of water through a selectively permeable membrane ( _______ to ________) GOAL IS TO REACH EQUILIBRIUM

Osmotic Solutions

Osmosis - The _____________ of ____________ through a _____________ membrane. Always travels from an area where water is ______________ to an area where water is ___________. ( _______ to ________) GOAL IS TO REACH ________________

Prefixes: HYPO = _____ HYPER = ______ ISO = _______ Solutions: HYPOtonic - ___________ solute concentration HYPERtonic - ___________ solute concentration ISOtonic - ____________ solute concentration

Water and Solute concentration are always opposite of each other! So when SOLUTE is HIGH, as in a ______ tonic solution, then water is _____. So when SOLUTE is LOW, as in a _______ tonic solution, then water is __________.

Let’s Draw it!! H 2 O Solute

Let’s Draw it!! H 2 O Solute

Let’s Draw it!! H 2 O Solute

Questions??

Work on 1.Work on cell part & function Review (ONLINE) 2.Cell is like project 3.Study for skills check TUESDAY

Skills Check Tuesday Cell parts 1.Matching Cell parts/proteins & functions 2.Identifying what 5 cell parts could be found in all cells 3.Identifying whether cell parts belong in Prokaryotes, Eukaryotes, or Both 4.Identifying whether cell parts belong in Animals, Plants, or Both

Species of the day 11/25 Turkey Meleagris gallopavoMeleagris gallopavo

Species of the day 11/25 Turkey Meleagris gallopavo Meleagris gallopavo Turkeys are a EUKARYOTIC organism. Name the 4 groups of Eukaryotic organisms.