B2

Question 1

What is a cell

Answer 1

The basic building block of a living organism

Question 2

What is a tissue

Answer 2

A group of cells with a similar structure and function and work together

Question 3

What is an organ

Answer 3

A collection of tissues working together to perform a function

Question 4

What is an organ system

Answer 4

A group of organs working together

Question 5

What is main function of digestive system

Answer 5

Digest food +absorb nutrients

Question 6

What is an enzyme

Answer 6

A biological catalyst- increases the speed of reaction without being changed or used up in a reaction

Question 7

What is an enzyme’s active site

Answer 7

A unique shape that fits onto the substance involved in the reaction

Question 8

What breaks down carbohydrates

Answer 8

Amylase - carbohydrate to simple sugars

Question 9

What breaks down proteins

Answer 9

Proteases- proteins to amino acids

Question 10

What breaks down lipids

Answer 10

Lipases- lipids to glycerol + fatty acids

Question 11

Where is bile produced

Answer 11

In the liver
Stored in the gall bladder

Question 12

What are carbohydrates for

Answer 12

Source of energy

Question 13

What are proteins for

Answer 13

Growth + repair

Question 14

Lipids

Answer 14

Energy (stored)

Question 15

How to test for sugars

Answer 15

Benedict’s test
Heat in water
Changes colour

Question 16

Test for starch

Answer 16

Iodine
Turns blue/black

Question 17

Test for proteins

Answer 17

Biuret reagent
A purple colour/ purple rings are present

Question 18

Test for fats

Answer 18

Sudan III test
A red layer will form on the surface of the water

Question 19

What does the human digestive system do

Answer 19

• breaks down complex food substances
• provides very large surface area for maximum absorption of food

Question 20

What does the mouth and the stomach do

Answer 20

• mouth
  Begins digestion of carbohydrates
  -stomach
  Begins digestion of protein; small molecules such as alcohol absorbed

Question 21

What does the small and large intestine do

Answer 21

• small intestine
  Digests carbohydrates, protein and lipids- into single sugars, amino acids, fatty acids and glycerol
• large intestine
  Absorption of water

Question 22

What does the gut do

Answer 22

Has digestive enzymes which break down food into small soluble molecules that can be absorbed through the gut wall

Question 23

What is villi

Answer 23

Finger-like projections in the small intestine that provide a large surface area for the absorption of food

Question 24

What affects enzyme action

Answer 24

• temperature
  Too high - enzyme denatures
  Too low - not enough successful collisions
• pH
  Not too acidic or alkaline for that certain enzyme- can change the shape of the active site

Question 25

Need to finish

Answer 25

Good luck :)