Biological Molecules 1 exam qs
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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)
Protien molecules are made from chains of amino acids
Name the covalent bond between two adjacent amino acids in chain of amino acids (1)
peptide (bond / link)
2
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)
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)
hydrolysis;
water / H2O is, added / used / needed;
water / H2O is, added / used / needed;
3
Describe how an enzyme, such as pepsin, breaks down a substrate (5)
4
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)
(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)
- no units for, 2nd column / egg white
- amount (rather than volume / in 4th column);
- incorrect unit/ m, in final time, column;*
- amount (rather than volume / in 4th column);
- incorrect unit/ m, in final time, column;*
5
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)
(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)
- equal volume in each tube;
- add buffer / control pH;
- add buffer / control pH;
6
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)
(method on q)
(table 1.1 on q)
State the term that best describes the purpose of tube 6 (1)
CONTROL;
7
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)
(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)
- improve reliability;
- assess, variability / spread of results*
- allows calculation of MEAN
- assess, variability / spread of results*
- allows calculation of MEAN
8
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)
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)
contains only the elements carbon, hydrogen and oxygen = triglyceride and cholesterol*
insoluble in water = triglyceride, phospholipid, cholesterol
contains glycerol = triglyceride, phospholipid*
contains ester bond = triglyceride, phospholipid*
important in membrane structure = phospholipid, cholesterol
contains fatty acids = triglyceride, phospholipid
insoluble in water = triglyceride, phospholipid, cholesterol
contains glycerol = triglyceride, phospholipid*
contains ester bond = triglyceride, phospholipid*
important in membrane structure = phospholipid, cholesterol
contains fatty acids = triglyceride, phospholipid
9
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)
Describe the formation of a hydrogen bond between two molecules of water and explain why water can form these bonds (3)
- between O and H (of adjacent molecules);
- between, electropositive / delta+ (H) and electronegative / delta- (O);
- water molecules, is polar / has charge separation*
- between, electropositive / delta+ (H) and electronegative / delta- (O);
- water molecules, is polar / has charge separation*
10
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)
Why is the ability of water to act as a solvent important for the survival of organisms? (3)
- medium for (metabolic) REACTions;
- (because) allows (named) ionic compound(s) to separate;
- TRANSPORT;
- 4. TWO named transport, systems / media OR one example of a transport, medium / system, with a named example of what is transported;*
- (organisms can) absorb / take in (named) minerals / ions / (named) gas / food;
- able to dilute toxic substances
- (because) allows (named) ionic compound(s) to separate;
- TRANSPORT;
- 4. TWO named transport, systems / media OR one example of a transport, medium / system, with a named example of what is transported;*
- (organisms can) absorb / take in (named) minerals / ions / (named) gas / food;
- able to dilute toxic substances
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