11. Plasmalemma is the same as plasma membrane a· true. b. false 12. Phospholipi

Question

11. Plasmalemma is the same as plasma membrane a· true. b. false 12. Phospholipids are aiways oriented so that their polar head faces the calcium ions. a. true _-br-false 13. Which of these is not a function of the lipid bilayer? a. changes the temperature b. provides a flexible matrix imposes a barrier to permeability c. 14. Chitin is made up of a. lipid bilayer. b. proteins only. c. polymer of starch and some lipid. d. only glucose. rough the cell a. lipid bilayer. b. cell membrane. c. transmembrane sodium. d. glycoprotein. 16. The basic unit of life is a. molecule. b. cell. c. atom. d. element. e. ion. 17. Which of these is not true about enzymes? a. most of them are proteins b. are changed at the end of the reaction c. can only speed up the rate of the reaction d. very specific in function e. work better in specific medium.

Explanation / Answer

11. Yes. Previously plasma membrane was known as plasmalemma. It is also called cell membrane.

12. False. Phospholipids show partial asymmetry that means they are unequally distributed between cytoplasmic and exoplasmic phase.

14. Chitin is made up of polysaccharide means option d, that is only glucose.

17. True enzymes don't change at the end of the reaction. It only acclerates the speed of reaction by decresing the need of activation energy to reach transition state.

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