Which statement correctly summarizes osmosis?
Which of the following BEST summarizes the differences between osmosis and diffusion? Osmosis deals only with water. The passive transport of water across a membrane from a solution of lower solute concentration to a solution of higher solute concentration is best described as: osmosis.
Which of the following is the best explanation for why cholesterol?
Which of the following is the best explanation for why cholesterol decreases the permeability of biological membranes? Cholesterol binds to the outside surface of a membrane, thus blocking the movement of solutes.
Why do lipid bilayers form spontaneously?
Because their fatty acid tails are poorly soluble in water, phospholipids spontaneously form bilayers in aqueous solutions, with the hydrophobic tails buried in the interior of the membrane and the polar head groups exposed on both sides, in contact with water (Figure 2.45).
Which aspect of phospholipids is most important to the formation of bilayers?
Which aspect of phospholipids is most important to the formation of bilayers? They are amphipathic.
Which of the following explains osmosis?
Answer and Explanation: Osmosis is C) diffusion of water from a greater to a lesser water concentration across a selectively permeable membrane. See full answer below.
Which of the following is the most accurate description of osmosis?
So, the correct answer is 'Movement of water across a semi permeable membrane from an area of high water concentration to an area of lower water concentration'.
Which of the following is true of osmosis?
1. Which of the following is true of osmosis? Your answer : d. It refers to the movement of solutes.
How do the lipoproteins LDL and HDL influence heart disease risk?
HDL transport dietary fat to the liver and help keep fat from being stored in the liver. c. LDL benefit the heart by transporting cholesterol to the tissues and away from blood.
Why do phospholipids spontaneously arrange themselves in water?
Because phospholipids have both polar and hydrophobic parts, when they are in water they will spontaneously arrange themselves into ordered structures.
Why do lipid bilayers form spontaneously quizlet?
why do lipid bilayers form spontaneously? Because their hydrophobic tails cluster together spontaneously limiting their contact with water, since they are non polar, therefore achieving the lowest free-energy rearrangement.
When phospholipids are placed in water they spontaneously form which of the following?
In water, phospholipids spontaneously form a double layer called a lipid bilayer in which the hydrophobic tails of phospholipid molecules are sandwiched between two layers of hydrophilic heads (see figure below).
Why do phospholipids form a bilayer in water quizlet?
Understanding: Phospholipids form bilayers in water due to the amphipathic properties of phospholipid molecules. Amphipathic means there are both hydrophilic and hydrophobic regions in a single molecule. Phospholipids have a hydrophilic head region and hydrophobic tails.
Why does osmosis occur?
Osmosis occurs until the concentration gradient of water goes to zero or until the hydrostatic pressure of the water balances the osmotic pressure. Osmosis occurs when there is a concentration gradient of a solute within a solution, but the membrane does not allow diffusion of the solute.
What is required for osmosis to occur?
Therefore, for osmosis to occur, the membrane must be permeable to water, but impermeable to the solute, and the concentration of the solute must be different on the two sides of the membrane.
What happens during osmosis?
Osmosis is the transport of a solvent through a semipermeable membrane that separates two solutions of differing solute concentration. During osmosis, the solvent moves from the solution that is lower in solute concentration to the solution that is higher in solute concentration.
Where in an organism does osmosis occur?
The chyme travels into the small intestine. This is where osmosis takes place. The chyme has a higher concentration than the epithelial cells that line your intestines. So, in order to reach homeostasis, water moves into these cells through their semipermeable membranes, taking small nutrients along with it.
Does dietary cholesterol affect blood cholesterol Reddit?
No. Serum cholesterol levels are mostly unaffected by dietary cholesterol.
What role do low-density lipoproteins LDL play in cholesterol transportation?
Low-density lipoproteins (LDLs) transport cholesterol from its site of synthesis in the liver to the various tissues and body cells, where it is separated from the lipoprotein and is used by the cell.
What special property of phospholipid molecules explains their ability to spontaneously assemble into a lipid bilayer?
It impacts membrane fluidity. What special property of phospholipid molecules explains their ability to spontaneously assemble into a lipid bilayer? A. They are hydrophobic.
Why do phospholipids spontaneously form a bilayer when mixed with water quizlet?
When mixed with water, phospolipids spontaneously form membranes because the tails are hydrophobic (don't like water) and the heads are hydrophillic (like water because slightly polar). This causes the tails to move inside the layer and the heads to be on the outside.
Why do phospholipids spontaneously form bilayers when mixed with water quizlet?
When mixed with water, phospolipids spontaneously form membranes because the tails are hydrophobic (don't like water) and the heads are hydrophillic (like water because slightly polar). This causes the tails to move inside the layer and the heads to be on the outside.
Which of these choices is due to the ability of phospholipids to spontaneously form macromolecular structures when added to an aqueous solution quizlet?
Which of these choices is due to the ability of phospholipids to spontaneously form macromolecular structures when added to an aqueous solution? The ability of vesicles to bud off from the plasma membrane (endocytosis). The formation of lipid bilayers.
When phospholipids are placed in water Why does a bilayer form quizlet?
-Phospholipids are amphipathic with a hydrophilic phosphate group and one or two hydrophobic hydrocarbon tails. – They form bilayers because the hydrophobic hydrocarbon tails will be shielded from interacting with water and will form noncovalent interactions.
Why do phospholipids form a bilayer in water the phosphate portions repel each other the hydrophilic and hydrophobic parts attract each other?
-Phospholipids are amphipathic with a hydrophilic phosphate group and one or two hydrophobic hydrocarbon tails. – They form bilayers because the hydrophobic hydrocarbon tails will be shielded from interacting with water and will form noncovalent interactions.
Why is it important that the plasma membrane has both hydrophobic and hydrophilic properties?
This characteristic is vital to the structure of a plasma membrane because, in water, phospholipids tend to become arranged with their hydrophobic tails facing each other and their hydrophilic heads facing out.
Why does osmosis occur quizlet?
Osmosis is when water molecules travel across a cell membrane, moving to an area of higher concentration to one of a lower concentration so there is a balanced amount of water inside and outside the cell.
What are the factors affecting osmosis?
The factors affecting the rate of osmosis include:
- Pressure.
- Temperature.
- Surface Area.
- Water Potential.
- Concentration gradient.
What factors influence osmosis?
The factors affecting the rate of osmosis include:
- Pressure.
- Temperature.
- Surface Area.
- Water Potential.
- Concentration gradient.
Does chicken have cholesterol Reddit?
Red and White Meats Are Equally Bad for Cholesterol – "Contrary to popular belief, consuming red meat and white meat such as poultry, have equal effects on blood cholesterol levels, according to a study published today in the American Journal of Clinical Nutrition."
Does milk raise cholesterol Reddit?
No link between milk and increased cholesterol according to new study of 2 million people.