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3 years ago

What surrounds a cell and separates it from its environment?

2 answers:

7 0

Depends what kind of cell.
plant cell has a cell wall and an animal cell has a cell membrane. both of which protect and separates the cell from anything else

Effectus [21]3 years ago

4 0

A plant cell has a cell membrane and a cell wall. But an animal cell has a cell membrane....

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Tetracycline is an antibiotic that blocks tRNA from entering the ribosome and associating with mRNA. If tetracycline were added

melomori [17]

Answer: No proteins will be made if tRNA cannot bind to mRNA

Explanation:

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3 years ago

Alina [70]

The fern is a popular seedless vascular plant.
Edward Jenner first "discovered" a vaccine for cowpox, which provided immunity for smallpox.

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3 years ago

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Give a reason why Neurotransmitters are broken down by an enzyme just after passing an impulse from one neuron to the other????

DerKrebs [107]

Neurotransmitters are broken down by enzymes in order to avoid over-stimulation of a neuron and to allow for the transmission of impulse another impulse by the neurons.

<h3>What are neurotransmitters?</h3>

Neurotransmitters are chemical substances which are released at neuronal ends and which help transmit sction potential from one neuron to another.

After the transmission of impulse between the neurons, neurotransmitters ate broken down by enzymes.

Neurotransmitters are broken down by enzymes in order to avoid over-stimulation of a neuron and to allow for the transmission of impulse another impulse by the neurons.

Learn more about neurotransmitters at: brainly.com/question/1305933

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2 years ago

Read 2 more answers

The bacteria have an initial concentration of 1000 cells/cm3 . Each cell divides once every 30 minutes. Calculate how long it wi

Levart [38]

It will take <u>120 minutes</u> for the concentration to become > 15000 cells/cm³

<u>Given data:</u>

Initial concentration ( density ) = 1000 cells / cm³

Target/final concentration = > 15,000 cells /cm³

<h3 /><h3>Calculating the concentration every 30 minutes </h3><h3 />

<em>note</em><em> : Given that each cell divides every 30 minutes </em>

<u>After the first 30 minutes </u>

Concentration = 2000 cells / cm³

<u>After 60 minutes </u>

concentration = 4000 cells / cm³

<u>After 90 minutes </u>

concentration = 8000 cells / cm³

<u>After 120 minutes </u>

concentration = 16000 cells / cm³

Therefore after 120 minutes the concentration of the cells will be greater than 15000 cells/cm³ ( i.e. 16000 cells/cm³ )

Learn more about concentration : brainly.com/question/17206790

4 0

2 years ago

1)In your own words explain what air pollution is

Anna11 [10]

Explanation:

Question 1

Air pollution is the introduction of harmful gases and substances into the atmosphere that renders it unfit for use for life. Some of these toxic gases and particulates are:

Carbon monoxide
Carbon dioxide
Nitrogen oxides
Smoke
Dust particles
Soot

Question 2

Natural forms are the original nature or outlook of a substance. Examples of natural forms are:

Flowers
Leaves
Animals
Rocks
Shells
Corals

Question 3

Anthropogenic cause of pollution are human causes of pollution. Some of these are:

Combustion of fossil fuels in internal combustion engines release harmful and toxic gases into the atmosphere and causes hair pollution.
Improper disposal of waste can produce effluent that reaches the ground water system and other fresh water sources.
Noise pollution from airports is very harmful to ear.
Mining activities degrades soil and removes rich fertile soils that should be used for agriculture.
Mining wastes can lead to contamination of water bodies around.

Question 4

Fossil fuels are fuel types that forms from natural process in which organisms are decomposed anaerobically to preserve their energy components. Some of these fuels are:

Coal
Crude oil
Natural gas

Question 5

Heart diseases ; ischaemic heart diseases can lead to failure of the heart when it does not receive enough oxygen from the environment. Air pollution contaminates available oxygen in the atmosphere and this is very dangerous to life.
Lung cancer: poor air quality can lead to the development of cancerous tumor in the lungs.
Asthma: air pollution is one of the leading cause of asthma.

Other notable mentions are bronchitis, pulmonary diseases, stroke

Question 6

_7 million____ people die each year from air pollution according to the world health organization

Question 7

Air Quality Index(AQI) is an indicator used to express the quality of air in particular area. The AQI can tell the present air quality condition. It can also be used to forecast future air quality in years to come.

It shows how clean and polluted the air is.

Question 8

The air quality index uses different colors to alert people about the quality of air. Each color represents different health implication of air quality:

Attached image shows the different colors used to alert people of about the air quality.

Question 9

About 7 million people die annually as a result of air pollution
Beijing cough is new disease that emanates from the rising air pollution in Beijing
Asia has the fastest rising cases of air pollution problems.
The best way to reduce air pollution is by riding bicycles and walking more.

Learn more:

Air pollution brainly.com/question/10743354

#learnwithBrainly

3 0

3 years ago