Part A: Drag the terms on the left to the appropriate blanks on the right to com
ID: 54630 • Letter: P
Question
Part A: Drag the terms on the left to the appropriate blanks on the right to complete the sentences.
Part B: Drag the labels to their appropriate locations in the figure.
First, drag labels to targets (a) and (b) to indicate whether these environments are hydrophilic or hydrophobic.
Next, drag the phospholipid layers to targets (c) and (d) to indicate how they are oriented in the plasma membrane.
Finally, drag labels to targets (e), (f), and (g) to indicate which portions of the membrane protein are hydrophilic and which are hydrophobic.
Part C: How does phospholipid structure relate to the selective permeability of the plasma membrane?
A critical feature of the plasma membrane is that it is selectively permeable. This allows the plasma membrane to regulate transport across cellular boundaries--a function essential to any cell's existence. How does phospholipid structure prevent certain molecules from crossing the plasma membrane freely?
Drag the labels to fill in the table. Use only white labels for white targets, pink labels for pink targets, and blue labels for blue targets.
Explanation / Answer
A). 1. A phospholipid has a "head" made up of glycerol molecule attached to a single __phosphate____, which is attached to another small molecule.
2. Phospholipids vary in the small molecules attached to the phosphate group. The phospholipid shown in the figure has a ____Choline_____ attached to phosphate.
3. Because the phosphate group and its attachments are either charged or polar, the phospholipid head is___hydrophilic___which means it has an affinity for water.
4. A phospholipid also has two "tails" made up of two ___fatty acid______ molecules, which consist of a carboxyl group with a long hydrocarbon chain attached.
5. Because the C-H bonds in the fatty acit tails are relatively nonpolar, the phsophplipid tails are ___hydrophobic______. Which means they are excluded from water.