Water is moving across a membrane from solution A into solution B. What can be inferred? Solution A must have a lower solute concentration than Solution B. … High salt is hypertonic and causes the bacteria to shrink because water leaves the bacterial cell.
What regulates the flow of water through a cell membrane?
The flow of water across a membrane in response to differing concentrations of solutes on either side – osmosis – generates a pressure across the membrane called osmotic pressure.
Would phospholipids of the cell membrane be a good target for an antibiotic explain your answer?
Phospholipids of the cell membrane would not be a good target for an antibiotic because human as well as bacterial cells have phospholipids in their cell membranes, and thus the proposed antibiotic would harm both bacterial and human cells.
What are the two major components of cell membranes quizlet?
The major components of a cell membrane are phospholipids, glycolipids, proteins, and cholesterol. It provides the container for the cell contents and allows only small uncharged molecules to pass through while keeping larger molecules at bay. What properties do Phospholipids give the membrane?
How would you interpret a Petri dish with a single bacterial species that has small bacterial colonies growing in some contamination mold and large bacterial colonies far away from the mold?
How would you interpret a petri dish with a single bacterial species that has small bacterial colonies growing near some contaminating mold and large bacterial colonies far away from the mold? … The mold is secreting a substance that is slowing down the growth of nearby bacteria, but not causing them to burst.
Why does water move through a membrane?
So, why does water move across a cell membrane? Water, like many molecules, wants to be at equilibrium; it wants to have an equal concentration on either side of the membrane. The movement of water across a membrane to reach equilibrium is called osmosis. … Your cells are constantly working to maintain equilibrium.
Why aren’t there many drugs that act against bacterial cytoplasmic membranes?
Why aren’t there many drugs that act against bacterial cytoplasmic membrane? Since we don’t have cell walls the antimicrobial drug will not target our cells. If the drugs targeted bacterial plasma membrane than they will kill our plasma membrane cells as well. Store and transfer chemicals.
Which antibiotic disrupts the cell membrane?
Polymyxins are antibiotics. Polymyxins B and E (also known as colistin) are used in the treatment of Gram-negative bacterial infections. They work mostly by breaking up the bacterial cell membrane. They are part of a broader class of molecules called nonribosomal peptides.
Why do cell walls make good targets for antibiotic drugs?
Many antibiotics, including penicillin, work by attacking the cell wall of bacteria. Specifically, the drugs prevent the bacteria from synthesizing a molecule in the cell wall called peptidoglycan, which provides the wall with the strength it needs to survive in the human body.
What are the two major components of cell membranes?
The two major components of cell membranes are phospholipids and protein. Phospholipids are a unique type of lipid that have both hydrophilic and…
What is the main component of all membranes?
The principal components of the plasma membrane are lipids (phospholipids and cholesterol), proteins, and carbohydrate groups that are attached to some of the lipids and proteins. A phospholipid is a lipid made of glycerol, two fatty acid tails, and a phosphate-linked head group.
What are the two primary components of the cell membrane?
What are two main components of a cell (plasma) membrane? Two main components are the phospholipid bilayer and the proteins.
Which solute is least likely to cross the membrane simple diffusion?
Which of the following is least likely to cross a cellular membrane by simple diffusion? ANSWER: B, POTASSIUM IONS ARE CHARGED AND DO NOT PASS AS READILY THROUGH THE LIPID BYLAYER AS DO NON-POLAR GASSES AND LIPIDS.
What’s the movement of water through a semipermeable membrane?
Osmosis is a special type of diffusion, namely the diffusion of water across a semipermeable membrane. Water readily crosses a membrane down its potential gradient from high to low potential (Fig. 19.3) . Osmotic pressure is the force required to prevent water movement across the semipermeable membrane.
What is the major difference between facilitated diffusion and simple diffusion?
In simple diffusion, the molecules can pass only in the direction of concentration gradient. In facilitated diffusion, the molecules can pass both in direction and opposite of the concentration gradient. Simple diffusion permits the passage of only small and nonpolar molecules across the plasma membrane.
What are 3 examples of passive transport?
Three common types of passive transport include simple diffusion, osmosis, and facilitated diffusion.
What are the 4 types of passive transport?
The rate of passive transport depends on the permeability of the cell membrane, which, in turn, depends on the organization and characteristics of the membrane lipids and proteins. The four main kinds of passive transport are simple diffusion, facilitated diffusion, filtration, and/or osmosis.
What are the 3 types of diffusion?
1 Answer. Simple diffusion, osmosis and facilitated diffusion.
Can water pass through the cell membrane freely?
Because facilitated diffusion is a passive process, it does not require energy expenditure by the cell. Water also can move freely across the cell membrane of all cells, either through protein channels or by slipping between the lipid tails of the membrane itself.
What 3 molecules Cannot easily pass through the membrane?
Small uncharged polar molecules, such as H2O, also can diffuse through membranes, but larger uncharged polar molecules, such as glucose, cannot. Charged molecules, such as ions, are unable to diffuse through a phospholipid bilayer regardless of size; even H+ ions cannot cross a lipid bilayer by free diffusion.
Can water pass through the cell membrane without aquaporins?
It is important to remember that aquaporins do not actively transport water across the cell membrane; instead they facilitate the diffusion of water across the cell membrane.