D) It only transports small or non-polar molecules. 3. Which substance can go ac
ID: 206582 • Letter: D
Question
D) It only transports small or non-polar molecules. 3. Which substance can go across cell membrane without any protein helper? (1pt) A) CO2 B) Na C) CI D) Glucose 4. Which of the following statements about active transport is WRONG? (1pt) A) It requires energy can be in the forms of ATP or electrochemical gradient. B) A protein transport must participate to facilitate the process. C) It transports substance down the concentration gradient. D) It can be used to transport ions. 5. One of the ways that can maintain membrane fluidity in cold weather is to increase A) the average length of the fatty acid tails in membrane B) the percentage of cholesterol molecules in the membrane C) the percentage of saturated phospholipids in the membrane D) the number of hydrophobic proteins in the membrane 6. Which transport method is used by pancreatic cell to secret insulin (a protein hormone)? A) Diffusion B) endocytosis C) exocytosis D) Phagocytosis 7. Submerging a red blood cell in sea water will result in A) lysis of the cell B) the cell becoming shrink. C) the cell becoming turgid. D) the cell remaining unchanged. PagExplanation / Answer
3. CO2 transport across cell membrane takes place without any transport protein but by simple diffusion.
4. Option B is wrong rest are correct.
5. Cholesterol plays important role in maintaining membrane fluidity in cold climate. It actually keeps saturated fatty acid tails from packing and maintains membrane fluidity.
6.Exocytosis is the method used for transport insulin by pancreatic cells.
7. Cell shrinking will be there because sea water is salty so it is more concentrated which leads to release of water from the cell to the outside sea water.
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