AS & A Level Biology (9700) — May–June 2025, Paper 23
6 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Fig. 1.1 is a photomicrograph of a transverse section through part of a root of a Ranunculus species. The photomicrograph shows a cross-section of the vascular cylinder with…
Answer this question and get it marked →Bees are insects that produce venom as a means of self-defence. Melittin is a polypeptide present in the venom of bees. Lysine is one of the amino acids present in melittin. Fig.…
Answer this question and get it marked →Staphylococcus epidermidis is a species of bacterium that lives on human skin. Staphylococcus aureus is a pathogenic bacterium that can infect humans. S. epidermidis and S. aureus…
Answer this question and get it marked →Lysosomes are membrane-bound organelles found in mammalian cells. Scientists measured the concentration of cholesterol in the membranes of lysosomes in a mammalian cell. The…
Answer this question and get it marked →Telomeres are lengths of DNA that consist of repetitive nucleotide sequences. Telomeres are present in eukaryotic chromosomes. Outline the role of telomeres in eukaryotic…
Answer this question and get it marked →Monoclonal antibodies can be used in the treatment of disease. Describe how monoclonal antibodies are produced using the hybridoma method.
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