Digestive System

Question 1

Tissues

Answer 1

a group of cells of a similar type

Question 2

Organs

Answer 2

A group of different tissues working together

Question 3

Organ systems

Answer 3

A group of organs working together

Question 4

Organisms

Answer 4

A group of organ systems working together

Question 5

Carbohydrates

Answer 5

Provide us with fuel that makes all of the other reactions of life possible
They contain carbon, hydrogen and oxygen
Some carbs contain glucose or sucrose
Examples include bread and pasta

Question 6

Proteins

Answer 6

Build up of a cell and tissue as well as enzymes
Protein is found in tissue and hair.
A protein molecule is made of long chains if Amino acids (20).
Examples: meat and fish

Question 7

Lipids

Answer 7

Fats and Oils, they store energy in your body and is important in your diet.
Lipids very important in cell membranes, hormones and nervous system
Made of carbon, hydrogen and oxygen
Lipids also encompass molecules such as fatty acids

Question 8

Food tests

Answer 8

Cooked rice- no starch, protein, no sugar
Egg white- starch
Oil- no starch, no protein, lipids
Peas- starch, no protein
Lemonade- no starch, no protein, no lipids
Cheese- no starch, protein
Banana- starch, no protein
Yoghurt- no starch, protein
Mashed potato- starch, protein

Question 9

explaining the effect of pH and temperature on activity.

Answer 9

Temperature makes a reaction occur faster because of the way it gives more energy when it is at a higher temp. But when it hits a certain temp in this case that is 45 degrees we can see it dosent do this and does the opposite and will slow the time down. This is because at certain temp it will begin to break and the breaking down will no longer work or wont work well enough to do it in a quick time. The optimum temperature was 35 degrees. At low temperatures the egg white took a long time to be broken down because the enzyme and substrate molecules did not have much energy so collisions were infrequent. Substrate no longer fitted into active transport.

Question 10

Denatured

Answer 10

The Enzyme is denatured and stops working as they can no longer work as catalysts
Once something is denatured it is Irreversible.

Question 11

Proteases and peptidases

Answer 11

split proteins into small peptides and amino acids.

Question 12

Lipases

Answer 12

split fat into three fatty acids and a glycerol molecule.

Question 13

Amylases

Answer 13

split carbohydrates such as starch and sugars into simple sugars such as glucose.

Question 14

Nucleases

Answer 14

split nucleic acids into nucleotides.