2.6 . Proteins

Question 1

What are the 2 types of proteins?

Answer 1

Globular and Fibrous

Question 2

What are fibrous proteins mainly used for?

Answer 2

Structural

• keratin (nails)
• myosin (muscles)

Question 3

What are globular p[roteins mainlky used for?

Answer 3

Functional

• enzymes
• hormones

Question 4

What is an enzyme?

Answer 4

A biological catalyst?

Question 5

What is mainly responsible for the complicated shape of functional proteins like enzymes.

Answer 5

Intermolecular attractions MAINLY H- bonding

Question 6

What does “denaturing” mean with a protein?

Answer 6

Changing the shape (mainly of active site)

Question 7

What are the building blocks of proteins?

Answer 7

Amino acids

Question 8

What is the basic structure of an amino acid and what functional groups are present?

Answer 8

Question 9

What reactions do amino acids undergo to form peptides and proteins

Answer 9

Condensation reaction

Question 10

What is the functional group in peptides and proteins?

Answer 10

The peptide (amide) link (bond)

Question 11

What are “essential” amino acids?

Answer 11

Amino acids that cannot be synthesised by the body and must be taken in as part of the diet

Question 12

What bonds or attrcations are broken when a protein is denatured?

Answer 12

Hydrogen bonds

Question 13

What conditions can cause a protein to be denatured?

Answer 13

• temperature
• pH

Question 14

Proteins in the body

Answer 14

Question 15

Why must proteins be “digested”?

Answer 15

• Structures too large to be absorbed into bloodstream
• body needs individual amino acids

Question 16

What happens when proteins are digested?

Answer 16

They are hydrolysed