Class test # 2 Biol 251 Answer all question Name ts denatured but s fuctiona c)

Question

Class test # 2 Biol 251 Answer all question Name ts denatured but s fuctiona c) Is nit ditterent from regular enryme as shape is not importent d) Can be restored by extreme tempersture or ph swin 2Which one among the following describes the function of the plscma a The plasma membrane separates the cell from its external emeironment b) The plasma membrane encloses ceiular contents. c) The plasma membrane controls the movement of molecules from ane side of the cell to the other. d) All of the above are functions of the plasma membrane. 3. The plasma membrane is selectively permeable. Thlis means that a) only gasses and water can pass through it. Only ions and water can enter the cei nly certain substances can pass into or out of the cel All substances need carrier molecules to pass through 4.) 0.9% NaCl solution (saline ) is isotonic to a cell, while 2S% dextrose is a) hypertonic to cell b) isotonic to cell c) hypotonic to cel d) all of the above 5. Which of the following will increase the rate of diffusion ? a) increase viscocity of the solution bincrease molecular weight of the diffusing particle c) decrease concentration gradient d) increase temperature the following is a non membranous organells a) a mitochondria b) the rough endoplasmic reticulum ca centriole some

Explanation / Answer

Answer 1) answer will be a because if enzyme looses it's structure it means the it is denatured and non functional.

Answer 2) answer will be d because the above mentioned are the function of plasma membrane itself

Answer 3) the answer will be c that is it allows some molecules to paas in or out of the cell .

Answer 4)the concentration of sugar is very high so the answer will be a i.e. it will be hypertonic to cell.

Answer 5)if we increase temperature the rate of diffusion is also increase because the diffusion occur due to the kinetic energy of the molecule if the temperature is increased the kinetic energy also increased and hence diffusion rates also increase.

Answer 6) acentriole is the non - membranous organelle because it is formed by the help of microtubules only.

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