本题目来源于试卷: Unity and Diversity A.4 Cell Structure，类别为 IB生物学
[单选题]
Palisade mesophyll cells producw5j+lgi86 nyb e and rel-.uvyu2-ha/m frr vqd/ler4 vir 8)e*ease large amounts of carbohydrates. Which characteristics would r yu/ u- e /e qaih.2-*rr4fvdrvm)lv8you expect to observe in such cells?
A. a high density of mitochondria and a large central vacuole.
B. a high density of chloroplasts and an extensive Golgi apparatus.
C. a high density of chloroplasts and a large central vacuole.
D. a high density of mitochondria and an extensive Golgi apparatus.
参考答案: C
本题详细解析:
Palisade mesophyll ch .pu8(-iy 1*iw bmuhhells are cells in the leaves of plants that produce carbohydrates through photosynthesis. Since photosynthesis takes place within ch( .im by uhuh8hw1p*i-loroplasts, these cells contain a high density of chloroplasts They also contain a large central vacuole, which occupies the space at the center of the cell and helps maintain the turgor pressure in the cell. The position of the central vacuole ensures the chloroplasts will be pushed near the edges of the cell, where they can receive light. Additionally, the vacuole acts as a storage reservoir for water and other nutrients needed for photosynthesis.
Choice A and Choice D are incorrect because mitochondria are the site of aerobic respiration, during which carbohydrates are broken down to produce ATP. Choice D is also incorrect as the Golgi apparatus packages proteins, not carbohydrates, for export, so Choice B is also incorrect.
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