AQA Study guides, Class notes & Summaries

Question One - answer-In Q1, You will be directed to a certain portion of one of the sources and asked to pick out a number of truths from a list of statements. This is AO1 and assesses your understanding of the obvious and subtler parts of the extract. The question is worth 4 marks, and you should spend around 5 minutes answering it. Question Two - answer-Q2 requires you to write a summary of the differences between the two texts. This assesses your ability identify the explicit and implici...

Explain how the structure of DNA is related to its functions (6 marks) - answer-- sugar-phosphate (backbone)/double stranded/helix so provides strength/stability/protects bases/protects hydrogen bonds - long/large molecule so can store lots of information - helix/coiled so compact - base sequence allows information to be stored/ base sequence codes for amino acids/protein - double stranded so replication can occur semi-conservatively/strands can act as templates/complementary base pairing/A-...

How long should you take on question 1? - answer-5 minutes How long should you take on question 2? - answer-10 minutes How long should you take on question 3? - answer-15 minutes How long should you take on question 4? - answer-25 minutes How many marks is question 1 worth? - answer-4 marks How many marks is question 2 worth? - answer-8 marks How many marks is question 3 worth? - answer-12 marks How many marks is question 4 worth? - answer-16 marks How do you answer quest...

Question One - answer-In Q1, You will be directed to a certain portion of one of the sources and asked to pick out a number of truths from a list of statements. This is AO1 and assesses your understanding of the obvious and subtler parts of the extract. The question is worth 4 marks, and you should spend around 5 minutes answering it. Question Two - answer-Q2 requires you to write a summary of the differences between the two texts. This assesses your ability identify the explicit and implici...

Suggest the advantages of the change in blood flow in blood vessels during exercise. [3 marks] - answer--more blood flow to muscles during exercise -supplying more glucose and oxygen/ removing carbon dioxide/ lactic acid/ heat -for high rate of respiration/ to meet increased demand for energy Explain how microorganisms contributed to the increase in temperature during processing of organic waste. [2 marks] - answer-respiration produces heat explain the advantage of showing the data using...

Explain what is meant by an inelastic collision - answer-where kinetic energy is not conserved State, in words, the relationship between the force acting on a body and the momentum of the body - answer-Force is the rate of change of momentum State two quantities that are conserved in an elastic collision - answer--momentum -kinetic energy Use Newton's laws of motion to explain how the molecules of a gas exert a force on the wall of a container - answer--force is exerted on molecule by...

In large cells of U. marinum, most mitochondria are found close to the cell-surface membrane. In smaller cells, the mitochondria are distributed evenly throughout the cytoplasm. Mitochondria use oxygen during aerobic respiration. Use this information and your knowledge of surface area to volume ratios to suggest an explanation for the position of mitochondria in large U. marinum cells. - answer-1. Large(r) cells have small(er) surface area to volume ratio; 2. (Takes) longer for oxygen to d...

Describe a biochemical test to show that raffinose solution contains a non-reducing sugar. - answer-First heat the sample with an acid in a water bath and neutralise, then heat with Benedict solution in a water bath for five minutes. A positive test should produce a red precipitate. Explain the arrangement of phospholipids in a cell-surface membrane. - answer-Phospholipids are arranged in a phospholipid bilayer. The hydrophobic fatty acid tails point away from the water and the hydrophilic he...

Root hair cells take up water from the soil. Explain one way in which the root hair cell is adapted to this function. [2 marks] - answer-either large surface area [1] for more / faster osmosis [1] OR allow thin (cell) walls [1] for short(er) diffusion distance [1] Explain why the mean rate of water uptake is higher on a hot day than on a cold day. [3 marks] - answer-(on hot day) more water lost [1] more transpiration or more evaporation [1] so more water taken up ...

What process do plants use to move mineral ions into root cells? - answer-Active transport Describe how water moves from roots to the leaves. - answer-By transpiration stream in xylem. What advantage to a plant does having very few stomata on the upper surface of the leaf have? - answer-Less water lost so it will not wilt. Why should tools used to handle plants with TMV be washed afterwards? - answer-To prevent the virus spreading. How can scientists use a plant with a TMV-resistant ...