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Describe the general structure of all cell membranes. How does this membrane structure determine the selective permeability of what can pass across the membrane. Then describe 3 ways cell membranes will differ from one another.

Describe what gap junction are, emphasizing on how they are different two other cellular points of contact, their protein components and cellular function. Describe the three main sources of membrane fluidity.  Describe in detail what proteoglycans are, including their hygroscopicity and biological roles.

Below is a picture of the sodium-potassium (Na*/K*) pump. Na Higher concentration Lower concentration Na* ATP protein pump K* Lower concentration Higher concentration (i) When sodium and potassium ions move across the membrane using the Na*/K* pump, they are using which type of cell membrane transport? ( (ii) In your own words, describe the process by which sodium ions cross the membrane using the Na*/K* pump. Incorporate into your answer all of the following terms; higher concentration, lower concentration, ATP, concentration gradient, Na*/K* pump. (iii) In your own words, describe the process by which potassium ions cross the membrane using the Na*/K* pump. Incorporate into your answer all of the following terms; higher concentration, lower concentration, ATP, concentration gradient. Na /K pump Edit View Insert Format Tool 12pt Paragraph