AQA

AQA A-level DESIGN AND TECHNOLOGY: PRODUCT DESIGN Paper 1 Technical Principles QUESTION PAPER JUNE 2023

2023 AQA AS BIOLOGY 7401/1 Paper 1 Question Paper & Mark scheme with 100%verified solution Contrast the structures of ATP and a nucleotide found in DNA to give two differences. - answers - ATP has ribose and DNA nucleotide has deoxyribose - ATP has 3 phosphate groups and DNA nucleotide has 1 phosphate group Name the process by which fatty acids and glycerol enter the intestinal epithelial cell. - answers diffusion Explain the advantages of lipid droplet and micelle formation. - answers ...

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...

How does Interpretation A differ from Interpretation B about...? Explain your answer using Interpretations A and B (4 marks) - answer--Interpretation A differs from Interpretation B about... -Interpretation A suggests that... -This is because... (use your own knowledge to explain) -However, Interpretation B suggest that... -This is because... (use your own knowledge to explain) -don't need to mention author here, just how they differ Why might the authors of Interpretations A and B have...

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 ...