High institution Biology assist » cabinet Biology » cabinet Structures and Organelles » common Cell structures » expertise the cell Membrane and Cell wall surface
Explanation:

Bacteria and also plant cells both have cell walls, although the cell walls are composed of various macromolecules in different cell types. Plants use the protein chitin, when bacteria use peptidoglycan. Bacteria are a details class of prokaryotes.

You are watching: No cell wall only plasma membrane

Animal cells only have a plasma membrane, and do not have cell walls.


Explanation:

Two general concepts permit you come predict how conveniently a molecule is may be to overcome the plasma membrane.

1. The smaller the molecule, the an ext permeable the membrane is come it. Large molecules have a more tough time crossing the membrane.

2. Polar and also charged molecules have actually a an extremely hard time cross the membrane. Nonpolar molecules deserve to cross the membrane much more easily.

As a result, small, nonpolar molecule are right for crossing the membrane easily. Larger molecules perform not fit v the membrane gaps, and also polar molecules room repelled by the hydrophobic interior of the membrane.


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Example inquiry #3 : understanding The cell Membrane and Cell wall surface


An animal cell is inserted into a solution of salt water. The salt is can not to overcome the membrane. What will most likely take place to the cell?


Possible Answers:

The cell will shrivel


The cell will certainly break open


The cell will swell


The cabinet will remain the same


Correct answer:

The cell will shrivel


Explanation:

Since salt is unable to pass the membrane, the pet cell will certainly attempt come equalize the salt concentrations on both political parties by expelling water into the solution. The concentration that salt outside the cell is greater than the concentration within the cell. This means that water itself is much more concentrated within the cell 보다 outside. The water will flow down its gradient native high solvent concentration (in the cell) to low solvent concentration (outside the cell) via the procedure of osmosis. Together the water exits the cell, it will lose volume and shrivel.


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Example concern #4 : expertise The cell Membrane and also Cell wall surface


The cell walls of tree cells and bacteria allow them come __________.


Possible Answers:

move water right into the neighboring environment


endure hypertonic solutions far better than pet cells


maintain much less intracellular pressure


endure hypotonic solutions better than pets cells


Correct answer:

endure hypotonic solutions better than animals cells


Explanation:

The cell wall is a really tough framework that is maybe to help the cell resist extracellular stressors. A plant cell or bacterium deserve to survive hypotonic solutions better than an animal cell due to protection native the cell wall. Together water flows into the cell, yet the cell wall will save the cell from bursting.

The cell wall does not protect well against hypertonic environments, however. As water exits the cell, the plasma membrane pulls far from the cabinet wall. The cabinet shrinks within the cabinet wall, which maintains its initial size and does not stop cellular damage.


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Example concern #5 : knowledge The cell Membrane and Cell wall


Which that the complying with has a cell wall surface composed of peptidoglycan?


Possible Answers:

Plant cells


Bacteria


Animal cells


Archaea


Correct answer:

Bacteria


Explanation:

Peptidoglycan is found in the cell wall surfaces of bacteria. Tree cells have cell walls made the cellulose, and also animal cells absence a cell wall surface entirely. Archaea space a course of prokaryote, but have cell wall surfaces that differ from those the bacteria. Archaea cell walls carry out not save on computer peptidoglycan.


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Example inquiry #6 : understanding The cell Membrane and also Cell wall


Which the the following types of cellular transport requires the expenditure of energy in bespeak to take place?


Possible Answers:

Facilitated diffusion


Passive diffusion


Osmosis


Active transport


Correct answer:

Active transport


Explanation:

Diffusion and osmosis are both used in order come equalize the concentration of solutes ~ above both political parties of a membrane. This act requires no energy to take place, together solutes will certainly passively flow from areas of high concentration to areas of short concentration. Helped with diffusion calls for a channel protein to enable substances to cross the membrane, however also allows flow down a concentration gradient and also does not need energy.

Active deliver is required in order to accumulate solutes on one side of a barrier against their concentration gradient. This calls for ATP in stimulate to take place, as the solutes will not flow in this direction naturally.


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Example concern #7 : knowledge The cabinet Membrane and Cell wall surface


What go it typical when a cell membrane is "selectively permeable?"


Possible Answers:

The form of the membrane will certainly change, depending on the environment


Some compounds can cross the membrane, while rather cannot


Compounds can only go into the cell v channels


Harmful link cannot go into the cell


Correct answer:

Some compounds can cross the membrane, while rather cannot


Explanation:

The cell membrane is created of a phospholipid bilayer. Polar regions of the membrane face outward and shield a hydrophobic interior. Only certain compounds have the right to cross both areas of the membrane. Polar compounds and ions will be able to interact v the polar areas of the membrane, but be can not to overcome the hydrophobic interior. Similarly, large compounds will be unable to fit in between the phospholipids. Only small, nonpolar molecules have the right to cross the membrane freely.

Protein channels are put in the membrane to enable polar and big molecules to cross, further including to the selective nature of the membrane. Harmful compounds can still enter the cabinet from time to time, however the selectivity of the membrane helps avoid the potency of this attacks.


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Example inquiry #8 : expertise The cell Membrane and also Cell wall surface


Which of the following does not contain a cell wall?


Possible Answers:

Plant cells


Some fungi


All cells have actually a cabinet wall


Some protists 


Animal cells


Correct answer:

Animal cells


Explanation:

A cell wall is a tough, and also rigid class of polysaccharides lying outside of the plasma membrane in plants, part fungi, and also some protists. The cell wall surface provides this cells with structural support and protection. It also prevents over-expansion when water start the cell. Animal cells lack a cell wall, and also only have actually a plasma membrane.


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Example question #9 : expertise The cell Membrane and Cell wall


Which that the following controls what enters and also leaves the cell?


Possible Answers:

Nucleus


DNA


Cytoplasm


Cell membrane


Correct answer:

Cell membrane


Explanation:

The cell membrane controls what enters and also leaves the cell. The cell membrane is a selectively permeable phospholipid bi-layer, i beg your pardon admits molecules by passive and energetic transport into the inner of the cell. The DNA is the hereditary code uncovered in the nucleus while cytoplasm is the liquid inside the cell.


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Example concern #10 : understanding The cell Membrane and Cell wall surface


What is the best description of the fluid-mosaic model for a cell"s membrane?


Possible Answers:

A single layer the phospholipids with embedded proteins


A solitary layer that phospholipids


A twin layer of phospholipids


A twin layer the phospholipids with installed proteins


Correct answer:

A dual layer of phospholipids with installed proteins


Explanation:

The fluid-mosaic version for the cabinet membrane is a twin layer of phospholipids with embedded proteins. The proteins do active transport in pump molecules across the membrane. The phosphates are on the outside and also the lipid chains space on the within of the membrane.

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