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2 years ago

The ordinary light microscope is called a bright-field microscope because _____.

Biology

2 answers:

lianna [129]2 years ago

5 0

Answer:

The correct answer will be -The background appears brighter than the specimen which appears darker.

Explanation:

The light microscope uses sunlight energy to view the specimens in the microscope.

The light microscope is of two types depending on the appearance of the background of the specimens: Bright-field and Dark field specimens. Since in bright-filed microscope, the specimens appear darker than the background which appears darker helps visualize the sample clearly.

Thus, The background appears brighter than the specimen which appears darker is the correct answer.

coldgirl [10]2 years ago

3 0

It's called that because it employs visible light to detect small objects.

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A group of students is setting up a test to see whether earthworms prefer rough or smooth surfaces which type of investigation i

dezoksy [38]

Answer: The answer is A. Comparative

Explanation: The photo shows two different types of soil with the same type of worm. Therefore this it a comparative experiment. Trust me I got this question correct.

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3 years ago

a sample of human cells is suspended in a nutrient solution overnight. The next dasy, the scientist observes that the cells have

TEA [102]

The question is incomplete as it misses the options which are:

Cancer cells do not exhibit density dependent inhibition

Cancer cells do not require growth factors

Cancer cells do not exhibit anchorage dependence

Cancer cells ignore typical cell cycle checkpoints

Answer:

The correct answer will be option- Cancer cells do not exhibit anchorage dependence

Explanation:

A cell becomes tumour forming cell or cancerous cell when the cell undergoes some mutation in the DNA which causes uncontrolled cell division without differentiation.

As a result of the mutation, these cancerous cells show various properties which are present in the normal cells nut absent in cancerous cells like the cancerous cells lack the anchorage dependence.

Anchorage dependence is the property of the cells or the group of cells in which the cells maintain their adherence to the other layer of cells to communicate with each other.

Thus, the cancerous cells lack the anchorage dependence

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2 years ago

Which cell has both a cell wall and a cell membrane?<br><br> please answer quickly its urgent

mrs_skeptik [129]

Answer:

Plant Cell

contains both

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3 years ago

Why<br>is the hepatic portal<br>portal vein<br>unique ?

LiRa [457]

Answer:

Blood flow to the liver is unique in that it receives both oxygenated and (partially) deoxygenated blood. As a result, the partial gas pressure of oxygen (pO2) and perfusion pressure of portal blood are lower than in other organs of the body.

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2 years ago

One theory of aging that makes apparent commonsense postulates that organisms have only so much energy to expend in a lifetime.

Mashutka [201]

Given what we know, we can confirm that the basic idea resulting from these studies is that a creature's metabolism is related to its lifespan.

<h3 /><h3>How is metabolism related to lifespan?</h3>

From the studies done and the comparison of the lifespan of certain species in relation to their metabolic rates, scientists have noticed that <u>metabolism</u> and <u>lifespan </u>are inversely proportional. The <u>slower </u>the metabolism of an organism, the <u>longer </u>that organism can live.

Therefore, we can confirm that the basic idea is that a creature's metabolism is inversely proportional to its lifespan, meaning that the faster the metabolism, the shorter the lifespan of the creature in question.

To learn more about metabolism visit:

brainly.com/question/4707439?referrer=searchResults

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2 years ago