U1T4 – Amino Acids and Proteins

Amino Acids and Proteins

1 / 25

What is the name of the COOH group on an amino acid molecule?

Carbonic acid

Carboxyllic acid

Carbunkle acid

2 / 25

What is the name of the NH₂ group on an amino acid molecule?

Amine

Ammonium

Azide

3 / 25

What does R stand for on an amino acid?

Reduction Region

Reactionary Region

Variable Region

4 / 25

How many naturally occurring amino acids are there in all living things?

20

16

64

5 / 25

Which is the correct structure for an amino acid?

A

B

D

6 / 25

What is wrong with amino acid C?

There is an OH missing off the N group.

There is an extra OH group on the acidic group.

There is an OH group off the central carbon atom.

7 / 25

What is the name of the bond that forms between two amino acids?

Glycosidic

Ester

Peptide

8 / 25

Which of the following shows the correct structure of a peptide bond?

A

B

C

9 / 25

What is the name of this molecule?

Poly-peptide

Di-pepide

Bi-peptide

10 / 25

Glycine and Alanine are two common amino acids. How are their structures different to each other?

They will have different R groups

They will form polypeptide chains of different lengths.

The peptide bonds between them will be diferent

11 / 25

Water is produced during the bonding of two amino acids. Where do the hydrogen and oxygen molecules originate from?

Two Oxygens and a Hydrogen from the acidic 'C' end.

An Oxygen from the acidic 'C' end of one, and two Hydrogens from the 'N' end of the other.

A hydroxyl group from the acidic 'C' end of one, and a Hydrogen from the 'N' end of the other.

12 / 25

What type of reaction could break apart the bonded amino acids?

Condensation

Hydrolysis

Reduction

13 / 25

More than two amino acids joined together is called what?

Polyamine

Polysaccharide

Polypeptide

14 / 25

What do we mean by the 'Primary Structure' of a protein?

The number of amino acids in a single chain

The order of amino acids in a chains

3D shape of the chain

15 / 25

Other than peptide bonds, a folded protein also contains:

i) Hydrogen Bonds
ii) Ionic Bonds
iii) Di-Sulphide Bridges.

Which bonds form the secondary structure?

i)

i) and ii)

i), ii) and iii)

16 / 25

Other than peptide bonds, a folded protein also contains:

i) Hydrogen Bonds
ii) Ionic Bonds
iii) Di-Sulphide Bridges.

Which type of bond forms between two cysteine R groups?

i)

ii)

iii)

17 / 25

Other than peptide bonds, a folded protein also contains: i)Hydrogen Bonds ii) Ionic Bonds iii) Di-Sulphide Bridges. Which type of bond/bonds form and hold the Tertiary Structure of a protein in place?

i) Hydrogen Bonds
ii) Ionic Bonds
iii) Di-Sulphide Bridges.

Which type of bond/bonds form and hold the Tertiary Structure of a protein in place?

i) and iii)

iii)

i), ii) and iii)

18 / 25

What level of protein structure contains alpha helices and beta pleated sheets?

Secondary

Tertiary

Quaternary

19 / 25

Which of the following is the best description of the 'Quaternary Structure' of a protein?

A polypeptide and an extra group such as a prosthetic group (like haem in hemoglobin).

More than one polypeptide held together by bonds.

The folding of a polypeptie into a complicated globular structure.

20 / 25

Antibodies are made out of 4 polypeptide chains, with no prosthetic group. How many levels of protein structure will they have?

Tertiary only

Primary, secondary and tertiary.

Primary, secondary, tertiary and quaternary.

21 / 25

The structure of a protein relates to its function. What is the best description of a channel protein from the following?

Long polypeptide chains, lying next to each other in parallel or wrapped like rope.

Coiled proteins, often with hydrophillic amino acids liningteh inside of the coil.

Soluble, globular proteins with a specific shaped active site.

22 / 25

What is the name of the biochemical test for proteins?

Biuret

Benedicts

Sudan III

23 / 25

The sample needs to be treated before adding the regent. How does it need to be treated?

Add a few drops of NaOH to make it alkaline.

Heated in a boiling water bath for 5 minutes.

Add a few drops of HCl to make it acidic.

24 / 25

What is the next reagent to be added after this initial treatment?

Copper Carbonate

Copper Sulphate

Copper Oxide

25 / 25

What colour shows a positive result?

Brick red

Blue

Purple

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