AS & A Level Biology (9700) — October–November 2024, Paper 23
5 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Fig. 1.1 shows the structure of the human gas exchange system, with parts labelled A (larynx region), B, C (lung), D, E, F, G (bronchiole/alveoli region) by lines pointing to…
Answer this question and get it marked →Stem cells are found throughout the human body. Lgr5+ stem cells are found in the lining of the small intestine. Fig. 2.1 is a flow chart showing stages in the development of one…
Answer this question and get it marked →The five bases found in nucleic acids are described as nitrogenous organic compounds. There are two types of base. Fig. 3.1 shows the structure of the five bases: uracil (U),…
Answer this question and get it marked →Biofuels contain alcohols that are produced by the fermentation of sugars derived from crop waste. This waste contains cellulose and other organic compounds in cell walls.…
Answer this question and get it marked →T-lymphocytes are produced in bone marrow and mature in the thymus gland. When mature, T-lymphocytes leave the thymus gland to travel throughout the body. They remain inactive…
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