AS & A Level Biology (9700) — May–June 2023, Paper 41

Fig. 1.1 shows a transmission electron micrograph of part of a chloroplast (magnification x80 000), with four structures labelled A, B, C and D. A is the stroma, B is the…

Define the term ecosystem.

Farmers flood fields of rice because this encourages faster growth and higher yields. An adaptation of rice plants that allows them to grow in water is the development of…

Recombinant human proteins can be used to treat disease. Define the term recombinant DNA.

Fig. 5.1 is a photomicrograph of part of a kidney nephron (magnification x900), with two structures labelled A and B. Identify the structures labelled A and B in Fig. 5.1.

List the four possible genotypes of the rabbit shown in Fig. 6.1 (a rabbit with short fur and the Himalayan colour pattern).

Fig. 7.1 shows the structures of five amino acids with varying numbers and arrangements of carbon atoms: asparagine (4 carbon atoms), leucine (6 carbon atoms), methionine (5…

Fig. 8.1 shows a cell from the testis of a locust at the late prophase I stage of meiosis. The photomicrograph shows several condensed chromosomes, some of which are paired and…

Pyruvate carboxylase (PC) deficiency is a rare disease. The rate of respiration in the cells of a person with PC deficiency is much lower than normal. The passage describes the…

Sweet peas are garden plants that vary in height. - Tall sweet peas grow to 200 cm in height. - Dwarf sweet peas grow to 30 cm in height. - Tall sweet peas contain a dominant Le…