Area of study 1: Unity and diversity Read through these prompts to check if you are ready for the topic test.

Cell theory What are the three main points in this theory?

Microscopes Can you calculate the magnification of the light microscopes used in class? What is the difference between a light and scanning electron microscope? – Can you tell if a photo has been taken from a light microscope or SEM?

Prokaryotes and eukaryotes How are they different? Can you determine if a cell is a prokaryote or eukaryote if shown a photo or drawing?

Plants and animals How is their cell structure different? – Can you tell one from another by looking at a photo or sketch? – What organelles do they have in common? – What organelles are particular to only one cell type?

Cell organelles You should be able to identify these organelles in a drawing or photo from a light or scanning electron microscope and state their function (i.e. what they do). – Nucleus – Mitochondria – Chloroplast – Endoplasmic reticulum – Vacuole – Ribosome – Lysosome – Cell wall – Cell membrane

In what sort of cells may you find some of these organelles in large numbers? – E.g. Lysosomes are found in large numbers in white blood cells

Enzymes What is an enzyme and what do they do? How does the lock and key hypothesis explain how an enzyme specific to a particular chemical reaction? Why can enzymes be reused? Why is there an optimal pH or temperature for an enzyme to work? What happens to the enzyme when outside this optimal range?

Cell membrane Fluid mozaic model – What are the main parts? – What does it mean to say a membrane is ‘semi permeable?’

Organic and inorganic compounds What is the difference? Can you determine if a compound is organic or inorganic if you know a little about the compound?

Monosaccharides, disaccharides and polysaccarides – How are they different? – What are some examples of each?

Amino acids and proteins – How are they different? – What are some examples of proteins?

Saturated and unsaturated fats – What is the difference?

Diffusion, Osmosis and Active transport Definitions How are they similar? How are they different? Can you identify which process is involved if given details about a situation?

Isotonic, Hypertonic, Hypotonic Definitions Can you identify the type of solution when given details about how a cell changes?

SA:V Why are cells so small?

Cell division What three things can happen when a cell gets so large it cannot meet its needs by diffusion? What is mitosis? What is binary fission? – Can you identify what a cell undergoing binary fission would look like?