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Helga [31]
3 years ago
11

Which of the following best describes the main idea of the endosymbiotic theory

Biology
2 answers:
stealth61 [152]3 years ago
7 0
The endosymbiotic theory states that eukaryotic cells might have evolved from prokaryotic cells through a close realtionship.
Tresset [83]3 years ago
6 0
The endosymbiotic theory states that eukaryotic cells might have evolved from prokaryotic cells through a close realtionship.
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Neurons have special proteins in their cell membranes that allow them to generate electric current. Are these proteins most like
V125BC [204]

Answer:

Sodium-Potassium pumps (proteins that help neurons generate electricity) are produced by ribosomes on the rough endoplasmic reticulum (ER).

Explanation:

Sodium-Potassium Pump (NA+/K+):

The Na+/K+ Pump is a transmembrane channel protein, responsible for maintaining the concentration gradient of sodium and potassium ions in the intra and extracellular environment. This is achieve by pumping 3 Na+ outside and 2 K+ inside the cell at the cost of one ATP. In neurons, these channels help in generating an action potential across the cell membrane that gives rise to a nerve impulse.

Production of Transmembrane proteins:

All membranes and their proteins are produced by  the ribosomes on the rough ER. The rough endoplasmic reticulum contains the enzymes required for lipid synthesis; and as cell membranes are made of lipids, the ER is the most suitable location for synthesis. Membrane proteins, particularly, transmembrane proteins like the Na+/K+ pump possess hydrophobic surfaces that don't dissolve in the cytoplasm but readily attach to the ER surface from where they can be transported wherever required.

7 0
3 years ago
Molecules that are not able to independently diffuse across a membrane may still move down their concentration gradient by
GaryK [48]
Greater to lower concentration
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Which example best shows that the chemistry of water is helpful to plants?
Dovator [93]

Answer:

water polarity causes cohesion that pulls other water molecules up through a plant.

Explanation:

Water for plants is essential because it constitutes one of the necessary elements so that they can generate their food through the process called photosynthesis.

In effect, plants take the hydrogen from a water molecule and discard the oxygen, providing the atmosphere with this essential gas for life.

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