Chapter 3-Digestive System

Question 1

Size order of cells-body

Answer 1

Tissue (similar cells), organ, organ system, organism

Question 2

Digestive enzymes;

Answer 2

Amylase, protease, lipase and bile

Question 3

What does amylase do?

Answer 3

Made by salivary glands, pancreas and small intestine. Breaks down starch

Question 4

What does proteas do?

Answer 4

Made my stomach, pancreas and small instestine. Breaks down proteins into amino acids

Question 5

What does lipase do?

Answer 5

Made by pancreas and small intestine. Converts lipids into glycerol

Question 6

What does bile do?

Answer 6

Made in liver,stored in bile conduct. Alkaline,neautralises stomach acid and breaks down fat into droplets

Question 7

What tests are used for sugar?

Answer 7

Benedict test

Question 8

What test is used for starch?

Answer 8

Iodine solution

Question 9

What test is used for proteins?

Answer 9

Biuret test

Question 10

What test is used for lipids?

Answer 10

Sudan III

Question 11

Order of digestive system;

Answer 11

Mouth, gullet, liver, stomach, gall bladder/pancreas, small intestine, large intestine, rectum

Question 12

What does an enzyme do?

Answer 12

Speeds up a reaction

Question 13

What is the “lock and key model”?

Answer 13

An enzyme has an active site that only fits a particular substrate

Question 14

What is the “optimum temperature”?

Answer 14

The perfect temp for the enzyme to work,if it reaches above 45 degrees the enzyme denatures

Question 15

What is the “optimum pH”?

Answer 15

Normally neautral (pH 7) but pepsin which breaks down protein works best at pH 2

Question 16

Colour change of benedict solution (sugar);

Answer 16

Blue- Green, yellow or red (depending on content of sugar)

Question 17

Colour change of iodine solution (starch);

Answer 17

Browny/orange- black/blue

Question 18

Colour change of biuret test (protein);

Answer 18

Blue- Pink/purple

Question 19

Colour change of Sudan III (lipids);

Answer 19

Separate into two layers with the top layer being red

Question 20

What does hydrochloric acid in the stomach do?

Answer 20

Kills bacteria and gives the right pH for protease to work (acidic)

Question 21

What happens in the large intestine?

Answer 21

Excess water is absorbed