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IB Biology Carbohydrates, Proteins & Lipids

Total questions: 48

Worksheet time: 28mins

Name
Class
Date
1.

Which molecule is shown in the diagram?

a)

alpha glucose

b)

beta glucose

c)

ribose

d)

maltose

2.

Which molecule is shown in the diagram?

a)

alpha glucose

b)

beta glucose

c)

ribose

d)

maltose

3.

The smallest subunit (monomer) of all carbohydrates is called a (a)   .

4.

Which of the following carbohydrates are disaccharides?


One, some or all answers may be correct.

a)

maltose

b)

lactose

c)

starch

d)

sucrose

5.

Two alpha glucose molecules can be joined to form the disaccharide maltose.


Which type of reaction is used to produce maltose?

a)

carboxylation

b)

esterification

c)

hydrolysis

d)

condensation

6.

What is the name of the bond that is used to join monosaccharides together?

a)

ester bond

b)

peptide bond

c)

hydrogen bond

d)

glycosidic bond

7.

The monosaccharides glucose and fructose have the same molecular formula (C6H12O6).


They can join to form the disaccharide sucrose.


What is the molecular formula of sucrose?

a)

C12H24O12

b)

C12H23O10

c)

C12H22O11

d)

C12H20O10

8.

What type of reaction is used to breakdown a polypeptide (protein) into amino acids?

(a)  

9.

Which of the following monosaccharides are present in lactose?


One, some or all answers may be correct.

a)

alpha glucose

b)

fructose

c)

beta glucose

d)

galactose

10.

Which of the following could be a glycosidic bond?

a)

C-O

b)

C-N

c)

C-H

d)

C=C

11.

Which of the following structures is the molecule shown in the diagram present in?


One, some or all answers may be correct.

a)

maltose

b)

cellulose

c)

starch

d)

glycogen

12.

Please think carefully about this one!


"Where does all the magic happen?"

(a)  

13.

Which element is found in all polypeptides but is not found in carbohydrates or lipids?

a)

C

b)

O

c)

H

d)

N

14.

Which of the following carbohydrates contain(s) both alpha 1,4 and alpha 1,6 glycosidic bonds?


I. amylose

II. amylopectin

III. cellulose

a)

I only

b)

II only

c)

I and II only

d)

I, II and III

15.

Which of the following are true of amylopectin?


I. it is a branched molecule

II. it is found in cellulose

III. it contains both alpha 1.4 and alpha 1,6 glycosidic bonds

a)

I and II only

b)

I and III only

c)

II and III only

d)

I, II and III

16.

Which of the following properties allow starch to be a good energy storage carbohydrate?


One, some or all answers may be correct.

a)

it is soluble so there is no osmotic effect

b)

it is coiled so a lot can be fit into a small space

c)

it is a large molecule so cannot easily leave the cell

d)

it is branched so it is easier to remove glucose molecules

17.

Which of the following are true of cellulose?


I. it is a long and linear molecule

II. it contains beta 1,4 glycosidic bonds

III. cellulose chains are held together by hydrogen bonds

a)

I and II only

b)

I and III only

c)

II and III only

d)

I, II and III

18.

Which molecule is shown in the diagram?

a)

cellulose

b)

amylose

c)

amylopectin

d)

polypeptide

19.

Which molecule is shown in the diagram?

a)

cellulose

b)

amylose

c)

amylopectin

d)

polypeptide

20.

Which molecule is shown in the diagram?

a)

dipeptide

b)

disaccharide

c)

triglyceride

d)

polysaccharide

21.

What type of fatty acid is shown in the diagram?

a)

cis-unsaturated

b)

cis-saturated

c)

trans-saturated

d)

trans-unsaturated

22.

What type of molecule is shown in the diagram?

a)

dipeptide

b)

glycogen

c)

triglyceride

d)

phospholipid

23.

Cis-unsaturated fatty acids are healthier than trans-unsaturated fatty acids.


Which of the following properties of cis-unsaturated fatty acids contribute to this?


I. they have less bends in their chain

II. there are weaker attractive forces between their chains

III. they are more likely to form liquids (oils) than solids

a)

I and II only

b)

I and III only

c)

II and III only

d)

I, II and III

24.

Approximately how much energy is released per gram of fat, compared to per gram of carbohydrate?

a)

half

b)

equal

c)

double

d)

triple

25.

Which of the following are differences between a triglyceride and a phospholipid?


I. triglycerides contain glycerol

II. phospholipids have two fatty acids

III. phospholipids are amphipathic

a)

I and II only

b)

I and III only

c)

II and III only

d)

I, II and III

26.

What type of bond connects glycerol to fatty acids?

a)

glycosidic

b)

lipid

c)

ester

d)

peptide

27.

What type of molecule is shown above?

a)

carbohydrate

b)

polypeptide

c)

lipid

d)

DNA

28.

Which of the following is true of lipids?

a)

They contain carbon, hydrogen, oxygen and nitrogen

b)

They contain three fatty acids

c)

They contain glycogen

d)

They have a very low proportion of oxygen to carbon

29.

Which type of molecule is shown in the diagram above?

a)

fatty acid

b)

ribose

c)

amino acid

d)

lipid

30.

Which of the following is/are examples of hydrolysis reactions?


One, some or all answers may be correct.

a)

lactose --> glucose + galactose

b)

amino acid + amino acid --> dipeptide

c)

triglyceride --> glycerol + fatty acids

d)

glucose + fructose --> sucrose

31.

What is the main type of bond that contributes to the secondary structure of a protein?

a)

covalent

b)

peptide

c)

hydrogen

d)

ionic

32.

Which structure of a protein is shown in the diagram above?

a)

primary

b)

secondary

c)

tertiary

d)

quaternary

33.

Which structure of a protein is shown in the diagram above?

a)

primary

b)

secondary

c)

tertiary

d)

quaternary

34.

Where do hydrogen bonds form in a protein's secondary structure?

a)

between NH2 and COOH groups of adjacent amino acids

b)

between R groups of different amino acids

c)

between NH2 and COOH groups of non-adjacent amino acids

d)

between S (sulphur) atoms of different amino acids

35.

Which of the following bonds help to stabilise a protein's tertiary structure?


I. ionic

II. disulphide

III. peptide

a)

I and II only

b)

I and III only

c)

II and III only

d)

I, II and III

36.

What is true of all proteins that have a quaternary structure?

a)

they consist of four polypeptides

b)

they can attach to and release oxygen

c)

they consist of more than one polypeptide

d)

they contain iron

37.

Which of the following proteins has a very high tensile strength and becomes stronger when stretched?

a)

collagen

b)

spider silk

c)

rhodopsin

d)

immunoglobulin

38.

Which of the following proteins is present in the retina and makes the rod cells sensitive to low levels of light?

a)

collagen

b)

insulin

c)

rhodopsin

d)

immunoglobulin

39.

Which molecule has a very similar structure to starch?

a)

glycerol

b)

glycogen

c)

glucagon

d)

glucose

40.

What is mainly responsible for determining a protein's tertiary structure?

a)

hydrogen bonds between NH2 and COOH groups of adjacent amino acids

b)

interactions between the R groups of different amino acids

c)

hydrogen bonds between NH2 and COOH groups of non-adjacent amino acids

d)

peptide bonds

41.

What is a protein's primary structure?

a)

its specific sequence of DNA bases

b)

its specific sequence of amino acids

c)

the twisting of the protein chain due to hydrogen bonds forming

d)

the folding of the protein chain

42.

Which of the following are differences between a saturated and an unsaturated fatty acid?


I. saturated fatty acids contain the maximum number of hydrogen atoms

II. unsaturated fatty acids contain one or more C=C bonds

III. saturated fatty acids contain a C=O bond

a)

I and II only

b)

I and III only

c)

II and III only

d)

I, II and III

43.

Cellulose fibres connect together by hydrogen bonds to form (a)   .

44.

Which carbohydrate is shown above?

a)

cellulose

b)

amylose

c)

amylopectin

d)

amylase

45.

Which of the following is a difference between starch and glycogen?

a)

starch is branched and glycogen is linear

b)

only starch contains amylose

c)

starch is made from alpha glucose and glycogen is made from beta glucose

d)

starch is found in plant cells and glycogen is found in animal cells

46.

An amino acid has the formula:


NH2C(CH3)HCOOH


What R group does it have?

a)

H

b)

C2H3

c)

CH3

d)

C2H4

47.

The following bond is used to connect molecules together in a substance:


C-O-C


What could this substance be?


I. a disaccharide

II. a protein

III. a triglyceride

a)

I and II only

b)

I and III only

c)

II and III only

d)

I, II and III

48.

Which of the following are true of phospholipids?


I. they contain a phosphate group

II. they are fully hydrophobic

III. they contain two fatty acids

a)

I and II only

b)

I and III only

c)

II and III only

d)

I, II and III

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