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aqa A-level BIOLOGY Paper 3 (7402/3) JUNE 2023 QUESTION PAPER. 1. Describe how stimulation of a Pacinian corpuscle produces a generator potential.2. Use Figure 1 to describe what is meant by the all-or-nothing principle. 3. On Figure 1, from 0.6 ms to 4.0 ms, no new generator potential could be produced. What is this time period called? 4. The student repeated the experiment using yeast in maltose solution. She found the rate of carbon dioxide production was slower than with yeast in glucose s...

aqa A-level BIOLOGY Paper 2 (7402/2) JUNE 2023 QUESTION PAPER . A student used chromatography to separate the different photosynthetic pigments in a chlorophyll solution. She had the following materials. Chromatography paper A ruler and pencil Suitable glassware A solvent (solvent A) 2 cm3 of the chlorophyll solution. Describe how she could use these materials to separate the photosynthetic pigments by chromatography. Using solvent A, the student separated five pigments. She then repeated h...

aqa A-level BIOLOGY Paper 1 (7402/1) JUNE 2023 QUESTION PAPER. 1. Give the three structural features found in all virus particles and describe the function of one of these features. 2. Explain why viruses are described as acellular and non-living. 3. Give one reason why antibiotics are not effective against viruses. 4. Chitin keeps the tracheae open in the tracheal system of gas exchange in an insect. Gas exchange does not occur in the tracheae. Explain the importance of one adaptation of the ...

aqa A-level BIOLOGY Paper 1 (7402/1) JUNE 2023 QUESTION PAPER 1. Give the three structural features found in all virus particles and describe the function of one of these features. 2. Explain why viruses are described as acellular and non-living 3. Give one reason why antibiotics are not effective against viruses. 4. Chitin keeps the tracheae open in the tracheal system of gas exchange in an insect.Gas exchange does not occur in the tracheae. Explain the importance of one adaptation of the gas ...

aqa AS BIOLOGY PAPER 2: MAY 2023 CORRECT Question Paper. 1. Which statement about the function of ribosomes is correct? Tick () one box. [1 mark] Site of transcription, catalyse the joining of amino acids by hydrolysis reactions Site of transcription, catalyse the joining of nucleotides by condensation reactions Site of translation, catalyse the joining of amino acids by condensation reactions Site of translation, catalyse the joining of nucleotides by hydrolysis reactions 2. Name t...

aqa AS BIOLOGY PAPER 2: MAY 2023 CORRECT Question Paper. 1. Which statement about the function of ribosomes is correct? Tick () one box. [1 mark] Site of transcription, catalyse the joining of amino acids by hydrolysis reactions Site of transcription, catalyse the joining of nucleotides by condensation reactions Site of translation, catalyse the joining of amino acids by condensation reactions Site of translation, catalyse the joining of nucleotides by hydrolysis reactions 2. Name t...

aqa AS BIOLOGY PAPER 1: May 2023 Question Paper 1. Describe the primary structure of all proteins. 2. This question is about the genetic code. Define universal, non-overlapping and degenerate. 3. Streptococcus bacteria can infect the lungs when air is breathed in and cause lung disease. Describe the mechanism of breathing that causes air to enter the lungs. 4. Explain why phospholipids can form a bilayer but triglycerides cannot.