AQA A LEVEL BIOLOGY PAPER 1 UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
Question:
1. Water removed from the reactants joining two molecules
together forming a chemical bond
Answer:
Condensation
Question:
2. The addition of water to the reactants to break a chemical
bond between 2 molecules
Answer:
Hydrolysis
Question:
1. Add Benedict's reagent. 2. Heat the solution in a water
bath for 5 minutes at 95 degrees Celsius. 3. Change from
blue to brick red as CuO formed
Answer:
Test for Reducing Sugars (3)
Question:
4. Smaller units from which larger molecules are made
Answer:
Monomer
Question:
1. Add 2cm³ of food sample then add 2cm³ of dilute HCl
and heat.
2. Add 2cm³ of NaHCO3 then do test for reducing sugars.
Answer:
Non-Reducing Sugars (2)
Question:
6. Add drops of iodine to starch solution. Colour change to
blue-black
Answer:
Test for Starch (1)
,Question:
1. Mix Test solution with ethanol.
2. Shake for 1 minute then add water.
3. Cloudy white emulsion
Answer:
Test for Lipids (3)
Question:
1. Obtain equal volumes of test solution and NaOH then
add a few drops of biuret solution (dilute copper (II)
sulphate solution).
2. Colour change to mauve/purple
Answer:
Test for Proteins (2)
Question:
1. Very high resolution.
2. Needs thin and dead specimen.
3. Artefacts can occur (remnant left on object during
prep, such as air bubbles)
4. Uses magnets to focus on specimen
5. Uses electrons fired at sample.
6. Is not in colour
Answer:
Transmission Electron Microscope (5)
Question:
1. Inhibitor is similar in shape to substrate so it
impermanently binds to the active site.
2. Prevents ESC from forming, slowing rate
Answer:
Competitive inhibition (2)
Question:
1. Molecule will bind to allosteric site.
2. Binding causes a change in active site.
3. Permanently preventing further ESC.
Answer:
Non-competitive inhibition (3)
, Question:
1. DNA helicase breaks the hydrogen bonds between the
base pairs
2. 2 single strands formed as the double helix "unzips".
3. Free DNA nucleotides in the nucleoplasm bond to the
complementary bases on the strand.
4. DNA polymerase forms phosphodiester bonds
between adjacent DNA nucleotides via condensation
reaction with the hydrolysis of ATP, forming the
phosphate backbone
Answer:
DNA Replication: Semiconservative (4)
Question:
1. ATP stores or releases only a small amount of energy at
a time, so no energy is wasted as heat.
2. Small and soluble so easily transported
3. Easily broken down, so energy is released
instantaneously
4. Can be quickly re-made
5. Can make other molecules more reactive via
phosphorylation
6. ATP can't pass out of cell, so the cell always has an
immediate supply of energy.
Answer:
Describe 6 properties of ATP that make it a good energy source. (6)
Question:
14. Prevents the cell from drying out. Allows bacteria to stick
to each other
Answer:
Slime capsule (2)
Question:
15. Used for attachment of a cell to a surface
Answer:
Fimbria
Question:
16. Involved in bacterial conjugation
Answer:
Pilli
QUESTIONS AND CORRECT ANSWERS
Question:
1. Water removed from the reactants joining two molecules
together forming a chemical bond
Answer:
Condensation
Question:
2. The addition of water to the reactants to break a chemical
bond between 2 molecules
Answer:
Hydrolysis
Question:
1. Add Benedict's reagent. 2. Heat the solution in a water
bath for 5 minutes at 95 degrees Celsius. 3. Change from
blue to brick red as CuO formed
Answer:
Test for Reducing Sugars (3)
Question:
4. Smaller units from which larger molecules are made
Answer:
Monomer
Question:
1. Add 2cm³ of food sample then add 2cm³ of dilute HCl
and heat.
2. Add 2cm³ of NaHCO3 then do test for reducing sugars.
Answer:
Non-Reducing Sugars (2)
Question:
6. Add drops of iodine to starch solution. Colour change to
blue-black
Answer:
Test for Starch (1)
,Question:
1. Mix Test solution with ethanol.
2. Shake for 1 minute then add water.
3. Cloudy white emulsion
Answer:
Test for Lipids (3)
Question:
1. Obtain equal volumes of test solution and NaOH then
add a few drops of biuret solution (dilute copper (II)
sulphate solution).
2. Colour change to mauve/purple
Answer:
Test for Proteins (2)
Question:
1. Very high resolution.
2. Needs thin and dead specimen.
3. Artefacts can occur (remnant left on object during
prep, such as air bubbles)
4. Uses magnets to focus on specimen
5. Uses electrons fired at sample.
6. Is not in colour
Answer:
Transmission Electron Microscope (5)
Question:
1. Inhibitor is similar in shape to substrate so it
impermanently binds to the active site.
2. Prevents ESC from forming, slowing rate
Answer:
Competitive inhibition (2)
Question:
1. Molecule will bind to allosteric site.
2. Binding causes a change in active site.
3. Permanently preventing further ESC.
Answer:
Non-competitive inhibition (3)
, Question:
1. DNA helicase breaks the hydrogen bonds between the
base pairs
2. 2 single strands formed as the double helix "unzips".
3. Free DNA nucleotides in the nucleoplasm bond to the
complementary bases on the strand.
4. DNA polymerase forms phosphodiester bonds
between adjacent DNA nucleotides via condensation
reaction with the hydrolysis of ATP, forming the
phosphate backbone
Answer:
DNA Replication: Semiconservative (4)
Question:
1. ATP stores or releases only a small amount of energy at
a time, so no energy is wasted as heat.
2. Small and soluble so easily transported
3. Easily broken down, so energy is released
instantaneously
4. Can be quickly re-made
5. Can make other molecules more reactive via
phosphorylation
6. ATP can't pass out of cell, so the cell always has an
immediate supply of energy.
Answer:
Describe 6 properties of ATP that make it a good energy source. (6)
Question:
14. Prevents the cell from drying out. Allows bacteria to stick
to each other
Answer:
Slime capsule (2)
Question:
15. Used for attachment of a cell to a surface
Answer:
Fimbria
Question:
16. Involved in bacterial conjugation
Answer:
Pilli
