How can a lipid be distinguished from a sugar?

How can a lipid be distinguished from a sugar? a) A lipid dissolves in water. b) Lipids are mostly nonpolar. Lipids are nonpolar molecules, whereas sugars are polar.

A lipid is made up of only hydrocarbons. A lipid dissolves in water. Lipids are mostly nonpolar.

Additionally, what is the name given to the process by which water crosses a selectively permeable membrane? Osmosis is a type of diffusion. True (Osmosis is the diffusion of water across a selectively permeable membrane.)

Secondly, what property of dishwashing liquid detergent makes it useful to wash grease from pans view available hint S?

Detergents form micelles around the grease, which are then washed away because the polar head groups facing outward on the micelle are water-soluble.

How are lipids distributed in a cell membrane?

By forming a double layer with the polar ends pointing outwards and the nonpolar ends pointing inwards membrane lipids can form a ‘lipid bilayer’ which keeps the watery interior of the cell separate from the watery exterior.

What two conditions must be present for osmosis to occur?

The two conditions that must be present for osmosis to happen are having a selectively-permeable membrane and differing concentrations of solute on

What type of transport is used to move lactose into the cell?

Lactose permease is a membrane protein which is a member of the major facilitator superfamily. Lactose permease can be classified as a symporter, which uses the proton gradient towards the cell to transport β-galactosides such as lactose in the same direction into the cell.

How does polarity affect transport through the membrane?

Answer and Explanation: Polarity does affect diffusion but only in the case where diffusion is occurring across the cell membrane. The cell membrane has a hydrophobic region that repels polar molecules. And so nonpolar molecules can diffuse into the cell membrane but polar ones cannot.

Is osmosis a type of diffusion?

Osmosis, a type of diffusion, represents the movement of water across a partially-permeable membrane, from an area of high water concentration to an area of low water concentration. Osmosis takes places in all cells.

Does temperature affect membrane permeability?

Generally, increasing the temperature increases membrane permeability. Between 0 oC and 45 oC the permeability increases as phospholipids start to move around more, as they have more energy, and therefore they’re no longer as tightly packed, meaning that the membrane is partially permeable.

What is the voltage across a membrane called quizlet?

voltage across a membrane is called membrane potential. isotonic is where there will be no net movement of water across the plasma membrane.

Does cholesterol affect membrane permeability?

In mammals, cholesterol increases membrane packing to reduce membrane fluidity and permeability. The fatty acids tails of phospholipids also affect membrane fluidity. Fatty acids can vary in length, and the number of double bonds in the hydrocarbon chain.

What is facilitated diffusion quizlet?

Facilitated Diffusion. the movement of specific molecules across cell membranes through protein channels. Not exactly diffusion because it’s a type of passive transport. Transport Proteins. protein molecules that help to transport substances throughout the body and across cell membranes.

What kinds of molecules pass through a cell membrane most easily?

Small nonpolar molecules, such as O2 and CO2, are soluble in the lipid bilayer and therefore can readily cross cell membranes. Small uncharged polar molecules, such as H2O, also can diffuse through membranes, but larger uncharged polar molecules, such as glucose, cannot.

Why are lipids and proteins free to move laterally in membranes?

This is because the fatty acid chains in the phospholipids are often unsaturated, so that they don’t pack together tightly. (This has two consequences: one, the fatty acids tails can move freely within the interior of the membrane and two, proteins and phospholipids can diffuse laterally through the membrane.

Which of these Cannot rapidly pass directly through the phospholipids?

Only fats play a structural role in cells. A; Small, nonpolar, lipid-soluble molecules can pass rapidly through the phospholipids of the plasma membrane. Ions, such as hydrogen ions, and hydrophilic molecules, such as water and glucose, cannot rapidly pass directly through the phospholipids of the membrane.

What are hypertonic solutions?

A hypertonic solution is a particular type of solution that has a greater concentration of solutes on the outside of a cell when compared with the inside of a cell.

Does active transport require energy?

Comparing Facilitated Diffusion and Active Transport. This process is called passive transport or facilitated diffusion, and does not require energy. The solute can move “uphill,” from regions of lower to higher concentration. This process is called active transport, and requires some form of chemical energy.

Where does water go in a hypertonic solution?

Water moves into and out of cells by osmosis. If a cell is in a hypertonic solution, the solution has a lower water concentration than the cell cytosol, and water moves out of the cell until both solutions are isotonic.