Fig. 1 shows cells from a sample of an unknown organism collected from a pond. The cells have a cell membrane, cytoplasm, a nucleus and a cell wall. They do...

Fig. 1 shows cells from a sample of an unknown organism collected from a pond. The cells have a cell membrane, cytoplasm, a nucleus and a cell wall. They do not have chloroplasts. The sample was later identified as yeast, a fungus used by bakers. When yeast has glucose and warm water, it releases carbon dioxide. The gas causes bread dough to rise. A baker asks why yeast is not classed as a plant even though its cells have a wall.

(a) What is structure B? [1]
(b) Give one structure shown in Fig. 1 that is also found in an animal cell. [1]
(c) Describe why yeast cells cannot make their own food by photosynthesis. [1]
(d) Complete the word equation for anaerobic respiration in yeast: glucose → ethanol + ______. [1]

Fig. 1 shows cells from the leaf of a Venus flytrap plant. When an insect touches sensitive hairs, the two halves of the leaf close. Digestive enzymes are then released and the plant absorbs mineral ions from the insect. The cells shown are from a green part of the trap and contain chloroplasts. The plant still needs photosynthesis to make glucose, although it gains nitrogen-containing compounds from captured food.

(a) What is structure A? [1]
(b) Give the name of the process that uses chloroplasts to make glucose. [1]
(c) Describe why the Venus flytrap gains an advantage from digesting insects even though its cells can make food. [2]
(d) Give one other structure present in these plant cells but not in animal cells. [1]