24.7.1, U LOS Which of the following is a reasonable explanation en membrane mor

Question

24.7.1, U LOS Which of the following is a reasonable explanation en membrane more fluid at lower temperatures a. the double bonds form kinks in the firty acid ailu amnsindus tightly. b. unsaturated fatty acids have a higherchoisterol aa mm membranes. c, unsaturated fatty acids are more polar than saturated d. the double bonds interaction among the 25, 7.3, U Los concentration with the help of transport proteins. Which af bilanuingamota glucose? a. simple diffusion b, osmosis c. facilitated diffusion d. active transport e, endocytosis/exocytosis 26. 7.1, U LO5 Which of the following types of molecules ane the major membrane? a. proteins and cellulose b. phospholipids and cellulose c. nucleic acids and proteins d. phospholipids and proteins e, glycoproteins and cholesterol 27. 7.3, AN LOS A patient has had a serious accident and lost alot af biood. replenish body fluids, distilled water, equal to the wailumeaftionilisuist iimm a. no unfavorable effect as long as the water is sterile b. red blood cells will shrivel because distilled water is typmtomictocoila d. red blood cells will shrivel because distilled water is hypotomicta anila 28. 1.1, U LO6 For most ecosystems, is (are) the ultimate sour of be firm returns to the ecosystem is a. sunlight heat b, heat, light c. plants; animals d. plants, heat e. producers: consumers

Explanation / Answer

25. C

Glucose molecules cant pass easily through cell membranes, passive diffusion is slow and may be problematic. Facilitatef diffusion solves this and allows the movement of glucose from high conc to low conc catalysed by transport proteins.

26. D

Plasma membrane is composed of lipids & proteins. Like a mosaic, the cell membrane is a complex structure made up of many different parts, such as proteins, phospholipids, and cholesterol.

27. E

Distilled watet is hypotonic to blood cells so the water enters the cells through osmosis and cause swelling of the cells.

28. Sunlight, heat.

Sunlight is the ultimate source of energy for all living beings as plants depend on sunlight to prepare food and all the animals and other living things depend directly or indirectly on plants to live. In the food chain during the transfer of energy from one tropic level to other heat is dissipated and released into ecosystem.

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