AQA A Level Biology Paper 1 EXAM QUESTIONS 208 TERMS WITH VERIFIED DEFINITIONS UPDATED 2024
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NU1426
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NU1426
AQA A Level Biology Paper 1 EXAM QUESTIONS (208 TERMS) WITH VERIFIED DEFINITIONS UPDATED 2024
Water removed from the reactants joining two molecules together forming a chemical bond
The addition of water to the reactants to break a chemical bond between 2 molecules
1. Add Benedict's reagent. 2. ...
1). Water removed from the reactants joining two molecules together forming a chemical
bond
Ans: Condensation
2). The addition of water to the reactants to break a chemical bond between 2 molecules
Ans: Hydrolysis
3). 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
Ans: Test for Reducing Sugars (3)
4). Smaller units from which larger molecules are made
Ans: Monomer
5). 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.
Ans: Non-Reducing Sugars (2)
6). Add drops of iodine to starch solution. colour change to blue-black
Ans: Test for Starch (1)
7). 1. mix test solution with ethanol.
2. shake for 1 minute then add water.
3. cloudy white emulsion
Ans: Test for Lipids (3)
8).
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, 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
Ans: Test for Proteins (2)
9). 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
Ans: Transmission Electron Microscope (5)
10). 1. inhibitor is similar in shape to substrate so it impermanently binds to the active site.
2. prevents esc from forming, slowing rate
Ans: Competitive inhibition (2)
11). 1. molecule will bind to allosteric site.
2. binding causes a change in active site.
3. permanently preventing further esc.
Ans: Non-competitive inhibition (3)
12). 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
Ans: DNA Replication: Semiconservative (4)
13). 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.
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, Ans: Describe 6 properties of ATP that make it a good energy source. (6)
14). Prevents the cell from drying out. allows bacteria to stick to each other
Ans: Slime capsule (2)
15). Used for attachment of a cell to a surface
Ans: Fimbria
16). Involved in bacterial conjugation
Ans: Pilli
17). Invagination of cell membrane. site of cell respiration (prokaryotes)
Ans: Mesosome
18). The ability to distinguish two points apart
Ans: Resolution
19). 1. lower resolution than tem
2. 3d image
3. does not require thin samples
Ans: Scanning Electron Microscope
20). The mass of organelles at the bottom of the test tube after centrifugation.
Ans: Pellet
21). Cold. low temperature slows enzyme activity, minimising self digestion by reducing
metabolic rate. isotonic. salt and sugar concentration kept the same, minimising organelle
size change due to osmosis. buffered. minimum changes in ph, so prevents enzymes in
organelles denaturing.
Ans: Solution Required for cell fractionation (6 Marks)
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, 22). 1. homogenisation. breaking up cells by blending the sample to create a homogenate.
2. filtering. filtering the large, unwanted sil, producing the filtrate.
3. ultracentrifugation. spin in a centrifuge so components separate out by weight. heavier
near the bottom of the tube.
4. supernatant is removed and spun again at higher speed.
Ans: Separation of Organelles From The Cells (4)
23). The solution not including the pellet at the bottom of the test tube after centrifugation.
Ans: Supernatant
24). 1. cell wall forms, dividing the two genetically identical daughter cells.
2. same circular dna.
27). Cell grows and carrys out its normal function
Ans: Interphase
28). Cells grow to normal size. organelles replicate and genes are expressed to make proteins
needed.
Ans: Interphase G1
29). Dna and histones replicated.
Ans: Interphase S
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