B4- The Processes Of Life

Question 0

Name three things that plant cells have and animal cells don’t?

Answer 0

Cell wall
Vacuole
Chloroplasts

Question 1

What is the function of:

a) The Nucleus
b) Mitochondria
c) The Cell Membrane
d) The Cytoplasm

Answer 1

a) Nucleus contains the DNA
b) Where reactions take place
c) Holds the cell together
d) Where proteins are made

Question 2

Yeast cells have mitochondria and a nucleus. True or false?

Answer 2

True

Question 3

Give a definition of an enzyme

Answer 3

Enzymes are proteins that speed up chemical reactions

Question 4

Describe the ‘lock and key’ model.

Answer 4

The lock and key model is where a substrate joins to an enzymes active site and the substrate has be the correct shape to fit into the active site.

Question 5

Name two things that affect how quickly an enzyme works.

Answer 5

Temperature

Ph

Question 6

Name two things that the energy released by respiration is used for.

Answer 6

Join molecules together

Make muscles contract

Question 7

What type of respiration, aerobic or anaerobic, releases more energy per glucose molecule?

Answer 7

Aerobic

Question 8

Write the word equation for aerobic respiration.

Answer 8

Glucose+oxygen»>carbon dioxide+water+(energy released)

Question 9

Give an example of when human cells respire anaerobically.

Answer 9

Doing exercise vigorously

Question 10

Anaerobic respiration releases energy. What else does it produce in:

a) Animal cells
b) Yeast cells

Answer 10

a) It can produce lactic acid in animal cells.

b) It produces ethanol and carbon dioxide

Question 11

Briefly describe how bread is made using yeast.

Answer 11

Yeast ferments the carbohydrates in flour and this releases carbon dioxide and causes bread to rise.

Question 12

What happens during photosynthesis?

Answer 12

Plants use energy from the sunlight to produce food which is glucose. The energy is converted into carbon dioxide and water into glucose and chlorophyll is needed for this to happen

Question 13

Write the word equation for photosynthesis.

Answer 13

Carbon dioxide+water»>glucose+oxygen

Question 14

Give three main ways plants use glucose.

Answer 14

Respiration
Chemicals for growth
Stored as starch

Question 15

Name three factors that can limit the rate of photosynthesis.

Answer 15

Amount of light
Amount of carbon dioxide
Temperature

Question 16

Describe how to take a transact.

Answer 16

You run a tape measure between two fixed points and then you start at one end of transect and collect the data you want.

Question 17

Describe how you might use a quadrat when investigating plants.

Answer 17

You can see how much of the ground is covered by a plant species using a quadrat. You can count how much of the quadrat is covered by the species. This will give you the percentage covered

Question 18

What is an identification key?

Answer 18

It’s a bunch of questions that you can use to figure out what a plant is.

Question 19

Give a definition of diffusion.

Answer 19

Diffusion is the passive overall movement of particles from a region of their higher concentration to a region of their lower concentration.

Question 20

Give two examples of chemicals that can move in or out of leaf cells by diffusion.

Answer 20

Carbon dioxide

Oxygen

Question 21

What is osmosis?

Answer 21

Osmosis is the overall movement of water from a dilute to a more concentrated solution through a partially permeable membrane