Amino acids

Last updated: 27/02/2020

WJEC A-Level Chemistry Unit 4.7 – Amino acids, peptides and proteins Amino acids

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Question 1 of 25

1. Question
What is the general formula for amino acids?
- $NH_2CRHCOOH$
- $NH_3CRHCOOH$
- $NH_3CRH_2COH$
- $NH_2CRH_2COH$
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Question 2 of 25

2. Question
What is another name for 2-amino acids?
- a-Amino acids
- Amines
- Zwitterions
- o-Amino acids
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Question 3 of 25

3. Question
Which of the following is made up of amino acids?
- Proteins
- Blood
- Hydroxides
- Acids
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Question 4 of 25

4. Question
How many functional groups do amino acids contain?
- 2
- 1
- 3
- 4
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Question 5 of 25

5. Question
Which of the following functional groups do amino acids contain?
- Carboxylic acid
- Aldehyde
- Amide
- Alkene
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Question 6 of 25

6. Question
Which of the following functional groups do amino acids contain?
- Amine
- Alcohol
- Ester
- Amide
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Question 7 of 25

7. Question
Which of the following types of compounds do amino acids act as?
- Bases
- Alcohols
- Ketones
- Esters
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Question 8 of 25

8. Question
Which of the following types of compounds do amino acids acid as?
- Acids
- Alcohols
- Aldehydes
- Benzene
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Question 9 of 25

9. Question
What is the definition of a zwitterion?
- A molecule or ion having separate positively and negatively charged groups, leaving it neutral
- A molecule or ion having negatively charged groups, leaving it negative
- A molecule or ion having separate positively and negatively charged groups, leaving it negative
- A molecule or ion having positively charged groups, leaving it positive
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Question 10 of 25

10. Question
Describe the melting points for zwitterions.
- High melting points
- Melting points will depend on the zwitterion
- Relatively low melting points
- Low melting points
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Question 11 of 25

11. Question
Describe the ability for zwitterions to dissolve in water.
- Zwitterions dissolve in water
- Zwitterions dissolve in acidified water
- Zwitterions only dissolve in dissolved water
- Zwitterions do not dissolve in water
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Question 12 of 25

12. Question
Which of the following types of compounds can act as zwitterions?
- Amino acids
- Esters
- Amines
- Alcohols
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Question 13 of 25

13. Question
Which of the following is the general formula of an amino acid acting as a zwitterion?
- $NH_3^+CH_2COO^-$
- $NH_3^+CH_2CO^-$
- $NH_2^+CH_2CO^-$
- $NH_2^+CH_2COO^-$
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Question 14 of 25

14. Question
NH $_2$ CCH $_3$ HCOOH is an amino acid. Which of the following statements is not true for this amino acid?
- It is not chiral
- It can form a peptide bond
- It is a zwitterion
- It can make up proteins
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Question 15 of 25

15. Question
What type of bond forms when the two functional groups within an amino acid link?
- Amide
- Amine
- Carboxylic acid
- Ester
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Question 16 of 25

16. Question
What is the definition of a peptide?
- A compound made by linking two or more amino acids together
- A compound made by forming a polyamide
- A compound made by linking two alcohols together
- A compound made by linking two esters together
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Question 17 of 25

17. Question
What is the definition of a peptide bond?
- The formation of an amide bond through the linking of a carboxylic acid and amine
- The formation of an ester bond through the linking of a carboxylic acid and alcohol
- The formation of an ester bond through the linking of a carboxylic acid and amino acid
- The formation of an ester bond through the linking of a carboxylic acid and amine
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Question 18 of 25

18. Question
What is another name for an amide bond?
- Peptide
- Carboxylic acid
- Polymer
- Ester
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Question 19 of 25

19. Question
When a peptide bond is formed from an amino acid, what compound is lost?
- Water
- Hydrogen
- Hydrochloric acid
- Oxygen
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Question 20 of 25

20. Question
What is formed when many amino acids are joined together?
- Polypeptides
- Polyesters
- Giant macromolecules
- Monomer
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Question 21 of 25

21. Question
What is a polypeptide called when it is formed from over 50 amino acids?
- Protein
- Esters
- Polymer
- Monomer
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Question 22 of 25

22. Question
What type of compound is formed when an amino acid reacts with an acid?
- Ammonium salt
- Esters
- Carboxylate salt
- Amide
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Question 23 of 25

23. Question
What type of compound is formed when an amino acid reacts with an alkali?
- Carboxylate salt
- Esters
- Amide
- Ammonium salt
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Question 24 of 25

24. Question
What type of compound is formed when an amino acid reacts with an alkali?
- Water
- Amide
- Ester
- Ammonium salt
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Question 25 of 25

25. Question
What type of compounds are formed when amino acids react with alcohols?
- Esters
- Amides
- Aldehydes
- Amines
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