Biological Molecules 1 exam qs

Pepsin is an enzyme that digests protein foods in the mammalian stomach
Protien molecules are made from chains of amino acids
Name the covalent bond between two adjacent amino acids in chain of amino acids (1)

Pepsin is an enzyme that digests protein foods in the mammalian stomach
Protien molecules are made from chains of amino acids
[Name the covalent bond between two adjacent amino acids in chain of amino acids (1)]

Name the type of reaction involved in breaking this bond an describe what happens in this reaction (2)

Describe how an enzyme, such as pepsin, breaks down a substrate (5)

1c. A student investigated how changing the pH affected the activity of pepsin
(method on q)
(table 1.1 on q)
Identify three errors the student made in the preparation of his table before he recorded his results (3)

1c. A student investigated how changing the pH affected the activity of pepsin
(method on q)
(table 1.1 on q)
Identify a change the student could make to his procedure that would increase the validity of the investigation (1)

1c. A student investigated how changing the pH affected the activity of pepsin
(method on q)
(table 1.1 on q)
State the term that best describes the purpose of tube 6 (1)

1c. A student investigated how changing the pH affected the activity of pepsin
(method on q)
(table 1.1 on q)
Another student suggested that he should repeat the investigation at least twice
How would this have imported the investigation? (2)

Lipids are a group of fatty or waxy compounds
Triglyceride, phospholipid and cholesterol are examples of lipid compounds that are importante in living organisms
Table (7.1) lists a number of statements that could apply to these compounds
Complete the table by indicating with a tick which of the compounds applies to each statement
You may use more than one tick in a row
[refer to table 7.1]
(6)

Hydrogen bonds also form between water molecules
Describe the formation of a hydrogen bond between two molecules of water and explain why water can form these bonds (3)

Hydrogen bonds allow water to act as a solvent
Why is the ability of water to act as a solvent important for the survival of organisms? (3)