AS & A Level Biology (9700) — February–March 2023, Paper 22
6 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Table 1.1 lists cell structures that can be found in eukaryotic cells or prokaryotic cells. Some of these cell structures can be found in both types of cell. Complete the table…
Answer this question and get it marked →Cysteine is an amino acid containing sulfur. Fig. 2.1 shows the structure of the molecule formed by joining two cysteine molecules together (a dipeptide), with each cysteine…
Answer this question and get it marked →Fig. 3.1 is a diagram of an area of phloem tissue from a transverse section through the stem of a squash plant, Cucurbita pepo, showing a companion cell and two sieve tube…
Answer this question and get it marked →Tuberculosis (TB), influenza and polio are examples of infectious diseases. Explain what is meant by an infectious disease.
Answer this question and get it marked →Pneumonia is a severe lung disease that can interfere with gas exchange. A person with pneumonia can be connected to an ECMO machine, which performs the gas exchange functions of…
Answer this question and get it marked →Collagen is the most common structural protein in vertebrates. Collagen provides the skin with flexibility and strength. Explain how the structure of a collagen fibre provides the…
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