AS & A Level Biology (9700) — May–June 2025, Paper 43
10 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 how a liver cell obtains glucose and how pyruvate produced by glycolysis is used. Glucose enters via transporter A, glycolysis (labelled B) takes place in the…
Answer this question and get it marked →Antibiotic resistance in bacteria has increased in recent years. A small polynucleotide drug has been developed to combat this. Some bacteria become antibiotic resistant by…
Answer this question and get it marked →E. coli bacteria were grown with glucose as the only carbon source. At time = 0, excess lactose was added to the culture. Fig. 3.1 shows the change in β-galactosidase activity…
Answer this question and get it marked →The Grand Canyon is located in Arizona, USA, formed as the Colorado River created a deep channel in the surrounding rocks. Before the canyon formed, an ancestral species of…
Answer this question and get it marked →Recombinant DNA technology is used to make recombinant human proteins. Two available methods to obtain the gene of interest are: cutting the gene out of genomic DNA using…
Answer this question and get it marked →The kidneys have a role in excretion and in osmoregulation. Excretion is the removal of the waste products of metabolism or the removal of substances that are in excess. Name the…
Answer this question and get it marked →A chloroplast is composed of many structures, each with a different function. Several chloroplast structures are listed: stroma, lamellae, thylakoid membrane, ribosome, thylakoid…
Answer this question and get it marked →The Boelen's python, Simalia boeleni, is a non-venomous snake found only on the island of Papua New Guinea. The International Union for Conservation of Nature (IUCN) has not…
Answer this question and get it marked →Most carnivorous mammals need to move to hunt their prey. Outline why a carnivorous mammal makes more use of its nervous system, rather than its endocrine system, when it hunts.
Answer this question and get it marked →The golden poison dart frog, Phyllobates terribilis, lives in the Colombian rainforest ecosystem. Define the term ecosystem.
Answer this question and get it marked →