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3 years ago

Mature red blood cells expel their nuclei so that they have more surface area to transport oxygen and

Biology

1 answer:

inysia [295]3 years ago

5 0

Answer:

The fact that mature red blood cells expel their nuclei, to expand their surface area and transport oxygen, can demonstrate that they cannot live very long.

Explanation:

The absence of a nucleus in mature red blood cells (erythrocytes) means that it has no genetic material and is unable to synthesize proteins to repair itself. This means a relatively short half-life for these cells.

A mature red blood cell circulates in the blood and performs its function for about 90 to 120 days, after which it is eliminated.

Regarding the other options:

B. Red blood cells can live more than 24 hours.

C. The absence of a nucleus in erythrocytes does not indicate any relationship with cancer.

D. Although they do not have mitochondria, erythrocytes can obtain ATP by glucose glycolysis and lactic acid fermentation. Even so, it is not related to the lack of nucleus

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Question 2 of 25

DedPeter [7]

Answer:

D. They form an ionic compound.

Explanation:

The bonds which are produced between a metal ion and a non-metal ion are termed as ionic bonds.

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3 years ago

Which of the following statements about chemiosmosis is NOT true?

melomori [17]

Answer:

I don't know the answer to the first one, but I can answer the second question. Cellular respiration has carbon dioxide and water as waste products.

Explanation:

Cellular respiration does not form glucose & oxygen and doesn't occur in the chloroplast, but does form ATP energy, carbon dioxide, & water and the process occurs in mitochondria. Photosynthesis on the other hand forms glucose & oxygen and does occur in the chloroplast.

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3 years ago

Help, please try to answer all :) Overdue

kolezko [41]

Answer:

1. C

2. I

3. B

4. I

5. A

Explanation:

1. Nonrenewable resources include oil, natural gas, coal, and nuclear energy.

2. Nonrenewable resources cannot be readily replaced at the speed with which they are being consumed.

3. Renewable sources include biomass energy (such as ethanol), hydropower, geothermal power, wind energy, and solar energy. Biomass refers to organic material from plants or animals, etc.

4. Because they take a very long time to form. They are not replaceable.

5. Corn can be used for ethanol fuel, and a new crop of corn can be grown and harvested each year. Corn is a renewable resource. Also, renewable resources cannot be replaced in our lifetime.

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3 years ago

Read 2 more answers

Please help very easy 5th grade work giving brainliest

strojnjashka [21]

Answer:

pretty sure its A hope this helps!

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3 years ago

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The cell theory eventually replaced the concept of spontaneous generation as a result of what experimental evidence?

Arisa [49]

Answer:- Option C - evidence that microorganisms cannot grow in boiled broth when new organisms were not allowed to enter.

Explanation:-

Theory of spontaneous generation stated that the living organisms can be created from non living matter. However, this theory was disapproved and replaced by the cell theory which stated that all living organisms are created from cells and new cells arise from pre-existing cells.

There were several experiments conducted by various scientists to disapprove the theory of spontaneous generation however, the experiment that was most successful to do so was the one conducted by Louis Pasteur in 1859.

Description of the experiment:-

-In his experiment, Pasteur boiled a meat broth in a flask (it was known that boiling the broth kills the micro organisms) and then heated the neck of the flask to bend into a S- shape.

The purpose of the S shaped neck was to allow the air to enter into the flask but not the micro-organisms as the micro organisms will settle by gravity in the neck and not reach into the flask.

observations of the experiment :-

1. Pasteur observed that even though the air entered the flask no micro organisms were growing in the flask.

2. Further,when he tilted the flask so that the broth came in contact with the part of the neck where the air borne microorganisms could have settled he was able to observe microbial growth in the flask.

These observations laid the theory of spontaneous generation to rest and proved that organisms can only grow in the presence of pre-existing cells which in this case were the microorganisms.

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3 years ago