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andreev551 [17]
3 years ago
11

A researcher observes membrane-bound structures in a cell. Based on this observation, the researcher can conclude that the cell

is classified as a
A bacterium.
B virus.
C prokaryote.
D eukaryote.
Biology
2 answers:
steposvetlana [31]3 years ago
5 0
The answer is D, Eukaryotic cells have membrane bound structures.
a_sh-v [17]3 years ago
4 0
The answer you are looking for is: 
D.) Eukaryote 
Hope that helps!! 
Have a wonderful day!!
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In a neuron, the opening of sodium gates typically leads to __________.
Mashcka [7]
<span>In a neuron, the opening of sodium gates typically leads to open and allows the exit of sodium ions out the cell. The neuron that contains for why myelinated fibers conduct signals faster than unmyelinated fbers are the d</span>iffusion of ions along the axoplasm is faster. At the same time, a traveling wave of excitation is <span>a nerve signal.</span>

8 0
3 years ago
Help me pleaseeeee!!
DochEvi [55]

Answer:

POLLUTANT, SOURCE AND IMPACT

Carbon Monoxide

SOURCE:- carbon monoxide main sources are from our homes, eg; wood stoves and fire place, generators, gas stoves, kerosene heaters, leaking chimneys, tobacco smokes etc

IMPACT:- carbon monoxide can cause organ failure as it reduces the amount of oxygen the hemoglobin been carried in the red blood cells to this organs in our body.

Carbon dioxide

SOURCE:- carbon dioxide can be from both human and natural source. Example of the sources includes; natural source ( ocean release, decomposition and respiration), human activities ( burning of coal, oil and natural gas, cement production etc)

IMPACT:- carbon dioxide causes difficulties in breathing as it displaces oxygen in the air.

It also increase the greenhouse effect (global warming) as more heat energy gets trapped by the atmosphere causing the planet to become warmer.

Sulphur dioxide

SOURCE:- sulphur dioxide mainly occur due to human activities such as fossil fuel combustion at industrial facilities, in ships etc.

IMPACT:- Sulphur oxide has been linked to many health effect and diseases such as cardiovascular diseases. It also causes respiratory problems, asphlegm and asthma attacks, irritation of lungs, throat and nose as well.

Nitrogen oxides

SOURCES:- nitrogen oxides also comes from human activities such as; combustion of fossil fuel, making of nitric acid, refining metals as well as petrols, explosive, food manufacturing etc.

IMPACT:- Nitrogen oxides has also been linked to many respiratory health issues such as bronchitis and wheezing. It causes the lining of the lungs to inflame there by reduce the immunity of the lungs to respiratory diseases.

Methane

SOURCE:- methane can be from either natural or human activities. The natural source includes; food digestion by cattles, decay of organic materials. Human activities such as waste management, rice production, oil and gas production etc.

IMPACT:- Methane is considered a green house gas like carbon dioxide, it contributes to the trapping of heat energy in the atmosphere which causes global warming. It is also linked to serious health issues such cardiovascular, respiratory and neurological problems.

Particulates

SOURCE:- particulates are fine tiny particles of matter found in the air, it might be in solid or liquid form. Example; dust, smoke, fumes etc. This particles can suspended in the air for an extended periods of time.

IMPACT:- exposure to particulates can cause variety of respiratory health problems such as difficulties in breathing, coughing, lungs and heart problem etc.

7 0
3 years ago
Explain the cell theory and distinguish between the three basic types of cells.
zepelin [54]
All organisms are composed of one or more cells
 
Cells are the basic unit of structure and function in a living organism

Cells come only from the reproduction of existing cells
3 0
3 years ago
Only the proteins that the bacteria Escherichia coli (E. coli) needs are synthesized at any given time. For example, when lactos
nataly862011 [7]

The correct answer is A. Lac repressor.

Lac repressor prevents lac gene which are found in the DNA of Escherichia Coli from being expressed for many times.

Lac repressor is termed as DNA which binds proteins. It allows the expression of genes from coding which are made for proteins to be involved in metabolism of lactose which is in bacteria.

When there is no lactose which is available in the cell, then the genes are being repressed. Lactose are being converted to allolactose if they are available.

8 0
3 years ago
Read 2 more answers
Plz help me well mark brainliest if correct!!...
nata0808 [166]
The answer is number 2. The whopping crane
4 0
2 years ago
Read 2 more answers
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