AS & A Level Biology (9700) — May–June 2024, Paper 23
6 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →The Zika virus is a pathogen that can infect human cells. Fig. 1.1 is a drawing of the structure of a Zika virus, showing an outer layer of repeating protein units enclosing an…
Answer this question and get it marked →Collagen is a fibrous protein that is found in many tissues in animals. Describe the structure of a collagen molecule and the structure of a collagen fibre.
Answer this question and get it marked →Arteries, capillaries and veins are three types of blood vessel. Table 3.1 shows some features of these three types of blood vessel. Complete Table 3.1 by using a tick if the…
Answer this question and get it marked →Lignin and suberin are polymers that are present in plant tissues. Describe and explain the roles of lignin and suberin in the transport of water through the roots and stem of a…
Answer this question and get it marked →Cyclin-dependent kinases (CDKs) are enzymes that regulate the cell cycle. Cell signalling by ligands causes the activation of CDKs in target cells. Outline the main stages in the…
Answer this question and get it marked →DNA and RNA are polynucleotides. Describe three ways in which the structure of messenger RNA (mRNA) differs from the structure of DNA. In each of your answers, include information…
Answer this question and get it marked →