课程名称︰普通生物学乙上 课程性质︰必修 课程教师︰陈俊宏 开课学院：医学院 开课系所︰医学系 考试日期（年月日）︰2009／12／03 考试时限（分钟）：110min 是否需发放奖励金：是 （如未明确表示，则不予发放） Ⅱ. 选择：(one point for each) 1. Which of the following is NOT a function of the plasma membrane proton pump? A. hydrolyzes ATP. B. produces a proton gradient. C. generates a membrane potential. D. equalizes the charge on each side of a membrane. E. stores potential energy on one side of a membrane. 2. If Ψp ＝ 0.3 MPa and Ψs ＝ -0.45 MPa, the resulting water potential (Ψ) is? A. +0.75 MPa B. -0.75 MPa C. -0.15 MPa D. +0.15 MPa E. impossible to calculate with this information. 3. Compared to a cell with few aquaporins in its membrane, a cell containing many aquaporins will A. have a faster rate of osmosis. B. have a lower water potential. C. have a higher water potential. D. have a faster rate of active transport. E. be flaccid. 4. In plant roots, the Casparian strip is CORRECTLY described by which of the following? A. It is located in the walls between endodermal cells and cortex cells. B. It provides energy for the active transport of minerals into the stele from the cortex. C. It ensures that all minerals are absorbed from the soil in equal amounts. D. It ensures that all water and dissolved substances must pass through a cell before entering the stele. E. It provides increased surface area for the absorption of mineral nutrients. 5. Pine seedlings grown in sterile potting soil grow much slower than seedings growing in soil form the area where the seeds were collected. This is most likely because A. the sterilization process kills the root hairs as they emerge from the seedling. B. the normal symbiotic fungi are not present in the sterilized soil. C. sterilization removes essential nutrients from the soil. D. water and mineral uptake is faster when mycorrhizae are present. E. both B and D. 6. One is most likely to see guttation in small plants when the A. transpiration rates are high. B. root pressure exceeds transpiration pull. C. preceding evening was hot, windy, and dry. D. water potential in the stele of the root is high. E. roots are not abosrbing minerals from the soil. 7. Which of the following is responsible ofr the cohesion of water molecules? A. hydrogen bonds between the oxygen atoms of a water molecule and cellulose in a vessel cell. B. covalent bonds between the hydrogen atoms of two adjacent water molecules. C. hydrogen bonds between the oxygen atom of one water molecule and a hydrogen atom of another water molecule. D. covalent bonds between the oxygen atom of one water molecule and a hydrogen atom of another water molecule. E. Cohesion has nothing to do with the bonding but is the result of the tight packing of the water molecules in the xylem column. 8. The opening of stomata is thought to involve A. an increase in the osmotic concentration of the guard cells. B. a decrease in the osmotic concentration of the stoma. C. active transport of water out of the guard cells. D. decreased turgor pressure in guard cells. E. movement of K+ from guard cells. 9. A plant cell with a solute potential of -0.65 MPa maintains a constant volume when bathed in a solution that has a colute potential of -0.30 MPa and is in an open container. What do we know about the cell? A. The cell has a pressure potential of +0.65 MPa. B. The cell has a pressure potential of -0.65 MPa. C. The cell has a pressure potential of +0.35 MPa. D. The cell has a pressure potential of +0.30 MPa. E. The cell has a pressure potential of 0 MPa. 10. A soil well suited for the frowth of most plants would have all of the following properties EXCEPT A. abundant humus. B. air spaces. C. good drainage. D. high cation exchange capacity. E. a high pH. 11. A farming commitment that embraces a variety of methods that are conservation-minded, environmentally safe, and profitable is called A. hydroponics. B. nitrogen fixation. C. responsible irrigation. D. genetic engineering. E. sustainable agriculture. 12. Which of the following is a primary difference between evtomycorrhizae and endomycorrhizae? A. Endomycorrhizae have thickerm, shorter hyphae than ectomycorrhizae. B. Endomycorrhizae, but not ectomycorrhizae, from a dense sheath over the surface of the root. C. Ectomycorrhizae do not penetrate root cells, whereas endomycorrhizae grow into invaginations of the root cell membrane. D. Ectomycorrhizae are found in woody plant species; about 85% of plant families from ectomycorrhizae. E. There are no significant differences between ectomycorrhizae and endomycorrhizae. 13. It is valid to consider water a plant nutrient because A. plants die without a water source. B. cell elongation depends mainly on the osmotic absorption of water by cells. C. hydrogen and oxygen atoms from water molecules are incorporated into organic molecules. D. transpiration depends on a continuous supply of water to leaves. E. most of a plant's mass of organic compounds is derived from water. 14. A mineral dificiency is likely to affect older leaves more than younger leaves if A. the mineral is a micronutrient. B. the mineral is very mobile within the plant. C. the mineral is required for chlorophyll synthesis. D. the mineral is a macronutrient. E. the older leaves are in direct sunlight. 15. Carnicorous adaptations of plants mainly compensate for soil that has a relatively low content of A. Potassium. B. Nitrogen. C. Calcium. D. water. E. Phosphate. 16. What is typically the result of double fertilization in angiosperms? A. The endosperm develops into a diploid nutrient tissue. B. A triploid zygote is formed. C. Both a diploid embryo and triploid endosperm are formed. D. Two embryos develop in every seed. E. The fertilized anitpodal cells develop into the seed coat. 17. In plants, which of the following could be an advantage of sexual reproduction as opposed to asexual reproduction? A. genetic variation. B. mitosis. C. stable populations. D. rapid population increase. E. greater longevity. 18. Under which conditions would asexual plants have the greatest advantage over sexual plants? A. an environment that varies on a regular, predictable basis. B. an environment with irregular fluctuations of conditions. C. a relatively constant environment with infrequent disturbances. D. a fire-maintained ecosystem. E. an environment with many seed predators. 19. Currently available transgenic plants have been modified for all of the following traits EXCEPT A. insect resistance. B. nitrogen fixation. C. herbicide resistance. D. improved nutritional quality. E. virus resistance. 20. Plant biotechnologists use protoplast fusion mainly to A. culture plant cells in vitro. B. asexually propagate desirable plant varieties. C. introduce bacterial genes into a plant genome. D. study the early events following fertilization. E. produce new hybrid species. --------------------------------打到手残，暂停中------------------------------ 终於知道打字小姐的辛苦了 全英文打下去眼残加手残 没用滑鼠也有疑似腕隧道症候群我还是第一次遇到@@ 还有20题等等再打... 手超痛T_T --

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