AS & A Level Biology (9700) — May–June 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 →The sinoatrial node (SAN) and the atrioventricular node (AVN) have an important role in the control of the cardiac cycle. The timing of atrial and ventricular systole and diastole…
Answer this question and get it marked →Fig. 2.1 is a photomicrograph of a longitudinal section (LS) through a root tip. Two different regions are visible: the root apical meristem and the root cap. Cells in the root…
Answer this question and get it marked →Cells of the immune system respond to the presence of non-self antigens. Outline the features of non-self antigens.
Answer this question and get it marked →Fig. 4.1 is a transmission electron micrograph of the form of T. brucei found in human blood, with a scale bar of 1 micrometre and a structure labelled X projecting from one end…
Answer this question and get it marked →The names of the bases present in RNA and DNA nucleotides can be abbreviated using a single letter. These are shown in Table 5.1. Complete Table 5.1 by stating: the name of each…
Answer this question and get it marked →The Weibel Lung model was developed after an extensive study of the gas exchange system. The model includes detailed measurements of airway diameters (lumen diameters of the…
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