Topic 1 - Key concepts

Question 1

Sub-cellular structures in sperm

Answer 1

• Head with genetic info
• Acrosome in head to penetrate egg
• Tail to swim

Question 2

Sub-cellular structures in egg

Answer 2

• Cytoplasm nutrient allows for early growth
• Nucleus with genetic info
• Cell membrane changes after fertilisation

Question 3

Sub-cellular structures in ciliated cells

Answer 3

• Hair like structures to move mucus and trapped particles up to the throat

Question 4

Electron microscope vs Light microscope

Answer 4

• Electron microscope uses electrons. Electrons have smaller wavelength, so detail is finer, including sub-cellular organisms

Question 5

Milli

Answer 5

10^-3

Question 6

Micro

Answer 6

10^-6

Question 7

Nano

Answer 7

10^-9

Question 8

Pico

Answer 8

10^-12

Question 9

Active site

Answer 9

• Site where substrate fits

Question 10

Enzyme specificity

Answer 10

• Only certain substrates fit into active site

Question 11

How can enzymes denatures

Answer 11

• Too hot
• Too acidic

Question 12

Calorimetry

Answer 12

• Food in sealed container with a volume of water is heated. Measures energy

Question 13

Osmosis

Answer 13

• Movement of water across a semi-permeable membrane to equalise solute concentration

Question 14

Percentage gain and loss of mass in osmosis

Answer 14

((Final Mass) - (Initial Mass) / Initial Mass) X 100