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Stella [2.4K]
3 years ago
8

What are the characteristics of prokaryotes? 1. A prokaryote lacks a well-defined nucleus. 2. A prokaryote cannot perform basic

life functions. 3. A prokaryote lacks cell organelles. 4. A prokaryote is larger than a eukaryote. 20 POINTS!
Biology
1 answer:
Neporo4naja [7]3 years ago
6 0

Answer:

1

Explanation:

A prokaryote has no nucleus the DNA just floats in the cytoplasm. All the other answers are incorrect, prokaryotes can perform life functions, have organelles, and are smaller than eukaryotes.

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Answer:

Air, water life without these is nothing

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3 years ago
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Compare and contrast the contributions of Neel, Pauling, and Ingram to our understanding of the genetic and molecular basis of s
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7 0
3 years ago
An adult inhales about 6.0×10−4 m3 of fresh air during a breath. Only 20% of fresh air is oxygen. Assume the pressure in the lun
Luda [366]

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3 0
3 years ago
Once a neuron is stimulated and the membrane potential is depolarized, the depolarized axonal membrane is helped to return to it
Vadim26 [7]

Answer:

Explanation:

The cell membrane separates the cell from the outer environment. The extracellular fluid contains the sodium ions (Na+), chloride ions (Cl-), while intracellular fluid contains potassium (K +) and negative anions.

The potential difference arises when the membrane is selectively permeable to some ions. The resting potential is -70mV.  

When the neurons get excited, the sodium ions start to enter by sodium channels.  

Now there are more positive ions inside the cell membrane. It disturbs the resting potential i.e. -70mV. This stage is known as depolarization.

When the inside environment of the cell is more positively charged, the potassium ions start to move out of the cell. It goes out by the voltage-gated channels. Thus resting stage is maintained and it is known as repolarization.

But the initial stability of the cell membrane has to be maintained. To restore the resting stage, the sodium ions start to move out of the membrane and potassium ions enter into the cells again. This is an active transport and has done by the Na+ - K+ pump. Here 3 sodium ions move out and 2  potassium ions pumped into the cell through the plasma membrane.  

Thus the resting potential regains. The potassium ions come back into the cells against the concentration gradient and ATP provides the energy for this phenomena.

4 0
3 years ago
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Which aspect of this source should make the reader question its credibility?
Dahasolnce [82]

Answer:

The correct option is A)  It is not written by an authority

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A piece of written work which does not mention the name of the writer may be considered to be not reliable and trustworthy. Hence, the correct option is A.

Other options, like option D, is not correct because a peer- reviewed journal carries authentic information as the work has been rechecked by different people who have expertise on the subject.

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