1. Two molecules that can pass easily through the plasma membrane, between phospholipids, include a) oxygen and starch b) salt and water c) starch and salt d) water and oxygen e) starch and water 2. When comparing two solutions, the one with more dissolved solutes is said to be a) hypotonic b) hypertonic c) isotonic d) in equilibrium 3. Turgor pressure builds up in a(n)_________ cell when it is placed in a(n)_______ solution. a) plant, hypotonic b) plant, hypertonic c) plant or animal, isotonic d) animal, hypotonic e) animal, hypertonic 4. The scent of a burning candle fills the entire room. This process is an example of a) osmosis b) diffusion c) endocytosis d) facilitated diffusion e) none of the above

1. Two molecules that can pass easily through the plasma membrane, between phospholipids, include a) oxygen and starch b) salt and water c) starch and salt d) water and oxygen e) starch and water 2. When comparing two solutions, the one with more dissolved solutes is said to be a) hypotonic b) hypertonic c) isotonic d) in equilibrium 3. Turgor pressure builds up in a(n)___ cell when it is placed in a(n)_ solution. a) plant, hypotonic b) plant, hypertonic c) plant or animal, isotonic d) animal, hypotonic e) animal, hypertonic 4. The scent of a burning candle fills the entire room. This process is an example of a) osmosis b) diffusion c) endocytosis d) facilitated diffusion e) none of the above

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter3: Cell Structure And Function

Section: Chapter Questions

Problem 18CTQ: Why is it advantageous for the cell membrane to be fluid in nature?

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(For this question my professor says that answer choice b) or d)is not correct. The correct choice is answer c). I just need help for the explantion as to why it is choice c. ) Question:The phospholipid composition of cell membranes causes the membranes to be impermeable to water molecules. However, Ca2+ and Mg+ and Cl- ions diffuse in and out of the cell because: a) Water is soluble in fatty acids found in phospholipids b) the Fatty Acid portion of the phospholipid component interacts with water c) the fatty acids are hydrophilic d) protein molecules embedded in the membrane function as H20 channels through the membrane, e) water is nonpolar.
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Why is it advantageous for the cell membrane to be fluid in nature?
While endocytosis and exocytosis refer to the direction in which a vesicle moves into and out of a cell respectively, it is important to think about what is being moved with and within the vesicles. To demonstrate how this process is utilized in human cells we will focus on the human body's insulin response. The purpose of the insulin response is to create a pathway for glucose entry into cells by releasing glucose transporters into the membrane. Cell Type #1- insulin producers: In humans, pancreatic B-cells create steroid insulin that can be packaged into vesicles starting at the ER. These vesicles are prepared for exocytosis so that the insulin can be released from the pancreatic B - cells and get into the bloodstream when signaled to do so. When glucose is present in the blood stream these cells will release the pre-packed insulin into the blood stream. Cell Type #2- insulin responders: Other cells do not produce insulin but instead respond when they have received the insulin signal…