Ch1 Life Processes

Question 1

What does the nucleus contain

Answer 1

Chromosomes/genes

Question 2

What do genes do

Answer 2

Controls the activity in the cell by determining which proteins the cell makes

Question 3

What do enzymes do

Answer 3

Control chemical reactions in the cytoplasm

Question 4

What is a substrate

Answer 4

A molecule which the enzyme is working on

Question 5

What is the active site

Answer 5

Each enzyme has a small surface area which the substrate attaches to. when it touches it lowers the energy needed for the reaction to start. Allowing products to be formed more easily

Question 6

What factors affect enzymes

Answer 6

• They work best at body temperature (37°C)

- Their optimum pH is seven (neutral)

Question 7

What is diffusion

Answer 7

“Movement of molecules down a concentration gradient” - happens when a substrate is more concentrated in one place than another. If there is an equal concentration of molecules there is no net movement.

Question 8

What is active transport

Answer 8

Against the concentration gradient cell uses energy from respiration to take up the particle

Question 9

What is osmosis

Answer 9

Water moves across so membranes
Happens when the total concentrations of all dissolve substances inside and outside the cells are different
Water will move from the more dilutes solution to the more concentrated one

Question 10

What are the eights life processes which are common to most living things

Answer 10

• Require nutrients
• Excrete
• Move
• Grow and develop
• Control
• Reproduce
• Response stimuli
• Respire