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3 years ago

A cell membrane is very specific about what it allows to cross.how does this help the cell?

Biology

1 answer:

riadik2000 [5.3K]3 years ago

8 0

Answer:

The cell membrane is selectively permeable . It lets some substances pass through rapidly and some substances pass through more slowly, but prevents other substances passing through it at all. Some small molecules such as water, oxygen and carbon dioxide can pass directly through the phospholipids in the cell membrane

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Why are chemotherapeutic agents that work on the peptidoglycan cell wall of bacteria a good choice of drug?

yanalaym [24]

Answer:

d. Humans and other animal hosts lack peptidoglycan cell walls.

Explanation:

Humans and other animals lack cell walls. Bacterial cells have peptidoglycan cell walls around them. The absence of cell walls in the cells of human and other animal host ensures that these cells are not affected by the drugs that target the peptidoglycan cell walls to kill or slow down the growth of the bacterial pathogen.

This makes the drugs specifically target the bacterial cells only while not affecting the host cells. If a drug would target a component present in cells of both the pathogens and hosts, the host cells would be most likely to be harmed by the drugs.

6 0

3 years ago

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Sulfur emissions from industry combine with water in the atmosphere and form acid rain. A new factory is built very close to the

Setler79 [48]

Sulfur emissions from industry combine with water in the atmosphere and form acid rain. A new factory is built very close to the lake that Josh visits often. By examining the table that shows what pH range different species can survive, Josh decides that the aquatic life will be affected by the changes in pH that the lake. Josh correctly decides that organisms that will be the most affected are

A) perch and frogs.

B) mayfly and bass.

C) snails and clams.

D) frogs and salamanders.

The correct answer is option (C) snails and clams.

Acid rain is formed when oxides of sulfur and nitrogen combine with water molecules. Industries are one of the major contributors to acid rain. pH is a measure of acidity or alkalinity in water.

A factory built close to the lake can cause acid rain which affects the pH of the lake. Any change in the pH of the lake has an effect on the organisms in it. A pH of 7 is considered to be neutral and pH values below 7 indicates acidity and pH values above 7 indicates alkalinity. Organisms have an acid tolerance level beyond which they are affected and can die. Perch has an acid tolerance of up to pH 4.5 and frogs can tolerate an acidic pH of 4.0. The acid tolerance level of Mayfly and Bass is a pH of 5.5. Salamanders can tolerate an acidic pH of 5. Whereas, Snails and Clams have a very less pH tolerance of 6. They are highly susceptible to acidic pH.

Thus, Josh correctly decides that organisms that will be the most affected are snails and clams.

6 0

3 years ago

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The bone that is situated next to the eardrum is called the __________; the bone that sits next to the oval window is called the

EastWind [94]

The bone that is situated next to the eardrum is called the malleus.

The bone that sits next to the oval window is called the stapes.

Given,

The bone that is situated next to the eardrum is called the __________; the bone that sits next to the oval window is called the __________.

We need to fill in the blanks.

<h3>What are eardrums and their parts?</h3>

The eardrum is a transparent gray membrane and there is a middle ear

bone called the malleus attached to the center part of the drum.

The space inside the ear drum is called the middle ear.

The three smallest bones of the body are found in the middle ear.

They are:

- The hammer (malleus)

It is attached to the eardrum.

- The anvil (incus)

It is in the middle of the chain of bones.

- The Stirrup (stapes)

It is attached to the membrane-covered opening that connects the middle ear with the inner ear (oval window)

Thus

The bone that is situated next to the eardrum is called the malleus.

The bone that sits next to the oval window is called the stapes.

Learn more about identifying the functions of parts of the ear

here:

brainly.com/question/13275697

#SPJ4

7 0

2 years ago

Which two structures would provide a positive identification of a plant cell under a microscope?

Sonbull [250]

There are some organelles which are found in plant cells but which are not found in the animal cells, these structures will provide a positive identification of a plant cell under a microscope.
The structures which would provide a positive identification of a plant cell under a microscope are CENTRAL VACUOLE, CHLOROPLAST [PLASTIDS] AND CELL WALL. These structures are only present in plant cells.

5 0

3 years ago

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Which of these statements is true?

I am Lyosha [343]

Answer:

DNA codes for RNA which codes for proteins... so A

if i could get brainliest that would be great :)

7 0

4 years ago

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