Topic 1 - Key concepts in Biology

Question 1

Three structures found in plant cells but not animal cells

Answer 1

Cell wall
Vacuole
Chloroplasts

Question 2

Prokaryotic and Eukaryotic. Which is simple and complex?

Answer 2

Prokaryotic - simple

Eukaryotic - complex

Question 3

Test for sugars

Answer 3

Benedicts solution

Add benedicts solution to food then heat in a water bath at 75C

Question 4

Test for starch

Answer 4

Add iodine

If present, will turn blue-black

Question 5

Test for proteins

Answer 5

Buiret test

Add POTASSIUM HYDROXIDE and then COPPER SULFATE solution.

If present it will turn purple

Question 6

Test for lipids

Answer 6

Emulsion test

Add ETHANOL and shake

If present it will turn milky

Question 7

Equation for energy in food

Answer 7

Energy = Mass of water X Temp change X 4.2

Question 8

Define diffusion

Answer 8

Overall movement of particles from an area of higher concentration to an area of lower concentration

Question 9

Define Osmosis

Answer 9

Overall movement of water molecules across a partially permeable membrane from a region of higher water concentration to a region of lower water concentration

Question 10

Define Active Transport

Answer 10

Movement of particles across a membrane from an area of lower concentration to higher concentration