It is a TAKE HOME QUIZ: feel free to use your text and notes to aid you. The qui

Question

It is a TAKE HOME QUIZ: feel free to use your text and notes to aid you. The quiz is due on___. Use a separate sheet of paper for your responses; answers must either be typed or legibly written. A solute moves into a cell across its membrane, through a transport protein. The solute is present is present on the outside of the cell at a concentration of 250 millimoles per liter. That same substance is present on the inside of the cell at a concentration of 100 millimoles per liter. Which one of these transport mechanisms must the cell to be using in this case? a) Simple diffusion. b) Osmosis. c) Facilitated diffusion. d) Active transport. e) Phagocytosis. Psychrophilic bacteria are those whose optimal growth temperatures range from -15 and 10 degree C. The membrance phospholipids of these bacteria have been shown to be predominantly cis unsaturated. Additionally, the fatty acid tails of the phospholipids are shorter than those observed in bacteria adapted to warmer temperatures. Explain why both characteristics would be essential adoptions for survival in a cold environment. Some bacterial infections of the intestinal tract irritates intestinal cells and reduces their ability to bring in digesting food. Such a condition is often accompanied by diarrhea. Based upon your understanding of the flow of water by osmosis, explain why diarrhea may occur in such infections. Note that this question is not asking about any aspects of a signal transduction pathway. In class, we studied a signal transduction pathway, initiated by epinephrine, that involves the production of cAMP and leads to the breakdown of glycogen into glucose, a major energy source for cells. The breakdown of glycogen a just one component of a wider "flight-or-fight" response that epinephrine brings about in stressful situations. The overall effect of epinephrine release on the body includes increased heart rate and increased alertness. Caffeine is a substance that blocks the activity of the enzyme. Given this information, explain why excessive coffee consumption and lead to a heightened state of alertness.

Explanation / Answer

1ans) Facilitated diffusion.It is the passive transport of molecules across cell membrane by a protein.

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