Unit 1 - Chapter 5 Sources of Energy

Question 1

Carbohydrates can be:

Answer 1

1. Monosaccharides
2. Disaccharides
3. Polysaccharides

Question 2

An example of a monosaccharide is

Answer 2

glucose

Question 3

An example of a disaccharide is

Answer 3

sucrose

Question 4

An example of a polysaccharide is

Answer 4

Glycogen

Question 5

Blood sugars which the carbohydrate

Answer 5

monosaccharide

Question 6

Blood sugars provide an immediate source of

Answer 6

energy for respiration

Question 7

If blood glucose levels fall they are topped up by the conversion of

Answer 7

muscle glycogen then liver glycogen to glucose

Question 8

In prolonged periods of exercise fatty acids from the break down of fat reserves become

Answer 8

the major energy source as the carbohydrates are depleted

Question 9

Amino acids cannot be stored in the

Answer 9

body

Question 10

Many amino acids which are not needed (surplus) are

Answer 10

broken down or deaminated

Question 11

When amino acids are broken down they give a

Answer 11

substrate for respiration and toxic urea

Question 12

Toxic urea is eliminated by the

Answer 12

kidney

Question 13

Protein from the muscles can be used as an energy source under extreme circumstances such as

Answer 13

starvation

Question 14

Lipids make an efficient energy store as fat contains

Answer 14

twice as much energy per gram compared to carbohydrate or protein

Question 15

The insulating properties of lipids are used to retain heat in an electrical

Answer 15

insulation film around nerve cells

Question 16

Steroid hormones are fat soluble and so are absorbed and transported in

Answer 16

lipids

Question 17

Steroid hormones are lipids such as

Answer 17

testosterone

Question 18

Fat pads beneath the skin protect the

Answer 18

tissues beneath the skin

Question 19

Fat pads are found in

Answer 19

feet and hands

Question 20

Benedicts reagent turns a brick red in the presence of

Answer 20

reducing sugar

Question 21

4 examples of reducing sugar are

Answer 21

1. Glucose
2. Fructose
3. Maltose
4. Lactose

Question 22

When sucrose fails to give a positive result with Benedicts reagent add a few drops of

Answer 22

Hydrochloric Acid

Question 23

Barfoed’s Test turns a brick red immediately in the presence of a

Answer 23

reducing monosaccharide sugar

Question 24

An example of a reducing monosaccharide sugar is

Answer 24

glucose and fructose

Question 25

Barfoed’s Test turns a sample a slight brick red after 10-15 minutes in the presence of a

Answer 25

disaccharide sugar such as maltose

Question 26

A clinistix test will produce a purple-blue colour in the presence of

Answer 26

glucose

Question 27

An iodine test will produce a blue black colour in the presence of

Answer 27

starch

Question 28

An iodine test will also produce a purple-red colour in the presence of

Answer 28

Glycogen

Question 29

Lipids contain the chemical elements

Answer 29

Carbon, Hydrogen and Oxygen

Question 30

Simple lipids are

Answer 30

fats and oils

Question 31

A simple lipids structure consists of a molecule of

Answer 31

glycerol and 3 fatty acids

Question 32

A phospholipid molecules contains two molecules of

Answer 32

fatty acid linked to one of glycerol which is linked to a phosphate

Question 33

The head of a phospholipid molecule is

Answer 33

hydrophilic (water Soluble)

Question 34

The Tail of a phospholipid is

Answer 34

hydrophobic (water insoluble)

Question 35

Fat is broken down into

Answer 35

Glycerol and fatty acids

Question 36

In respiration Glycerol is converted into

Answer 36

3 Carbon sugar and then into pyruvic acid.

Question 37

In respiration each molecule of fatty acid is broken down into

Answer 37

many molecules of acetyl co A

Question 38

What vitamins are fat soluble?

Answer 38

A, D, E and K

Question 39

In marathon running the order of energy used is

Answer 39

Glucose, Glycogen and Fat