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.

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.

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?

See similar textbooks

Similar questions

i have 4 homework questions related to cell transport. i answered them with the help of my notes but just wanted to verify if my answers are correct and if they are not then an explanation would be helpful. so can you confirm if the following bolded answers are correctly selected: 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
Match the definitions with the words: Direct Diffusion, Facilitated Transport, Active Transport a) passive movement of molecules through a protein channel, down the solute's concentration gradient b) using a vesicle to move many molecules into a cell c) movement of molecules through a protein transporter, requires ATP, against the solute's concentration gradient
Select the best answer or answers from the choices given: A physiologist observes that the concentration of sodium inside a cell is decidedly lower than that outside the cell. Sodium diffuses easily across the plasma membrane of such cells when they are dead, but not when they are alive. What cellular function that is lacking in dead cells explains the difference? (a) osmosis, (b) diffusion, (c) active transport (solute pumping), (d) dialysis.
Cell Membranes are: A)Fully permeable B)Impereable to all solutes c) Impereable to 50% of any solutes in a solution d)selectively permeable
Select the best answer or answers from the choices given: The term used to describe the type of solution in which cells will lose water to their environment is (a) isotonic, (b) hypertonic, (c) hypotonic, (d) catatonic
Choose the correct answer from the following 1- The cell membrane is considered semipermeable because: a) It allows the passage of all substances b) It allows the passage of only water c) It allows the passage of some substances while restricting others d) It does not allow the passage of any substances 2- The lipid layer of the cell membrane is mainly composed of: a) Proteins b) Carbohydrates c) Phospholipids d) Cholesterol 3- Integral proteins in the cell membrane: a) Are loosely bound and easily dissociate from the membrane b) pass through the entire thickness of the cell membrane c) Are responsible for the attachment of cells to their neighbors d) Serve as receptor sites for hormones and neurotransmitters 4- The fluid mosaic model of the cell membrane suggests that: a) The membrane is a solid structure with layers of proteins b) The membrane is a fluid with proteins floating within it c) The membrane is composed entirely of lipids
A cell containing 2% sucrose solution is placed in a hypertonic solution. A.) In one statement maximum, explain what a hypertonic solution is in reference to solute concentration. B.) In one statement, predict the direction of osmosis ( movement of water) C.) In one statement, predict the resulting change in the cell's shape.
1) Cystic fibrosis is due to a defect in a pump of the cell membrane. Discuss the causes and treatments of this disease.
1) All of the following are functions of proteins within a membrane except __________. A)Maintaining the fluidity of membranes B)transport ions and other polar substances C)receptors to bond molecules outside of the cell D)helping the body to recognize its own cells 2) Which of the following organelles is not part of the endomembrane system A)mitochondria B)golgi apparatus C)lysosomes D)rough endoplasmic reticulum 3) Which cytoskeletal element is composed of actin and is involved with muscle contraction and provided strength to cells during stretching and compression? A)Microfilimants B)Intermediate filaments C)Microtubules D)Flagella
Select the best answer or answers from the choices given: Osmosis always involves (a) a selectively permeable membrane, (b) a difference in solvent concentration, (c) diffusion, (d) active transport, (e) a, b, and c.
Diffusion means that a) smaller particles move across the membrane faster. b) all particles cross a membrane. c) particles move around until they are distributed evenly. d) particles stop when they are halfway across the membrane.
Among the statements a, b and c, which is/are false? a) Endocytosis is the formation of vacuoles by the plasma membrane for the purpose oftransport inside the cell a small content of extracellular fluid. b) Exocytosis is the formation of vacuoles by the plasma membrane for the purpose oftransport a small amount of intracellular fluid out of the cell. c) Pinocytosis is a form of endocytosis. d) All of these statements are false. e) None of these statements is false.