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schepotkina [342]
3 years ago
9

Thylakoids are membrane sacs that contain_______.

Biology
2 answers:
ki77a [65]3 years ago
4 0
The answer is B) Chlorophyll
mixer [17]3 years ago
3 0

The correct answer is chlorophyll.

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katovenus [111]
A) Natural selection


Hope this helps I took bio ;)
7 0
3 years ago
Components of the plasma membrane called ______ help form the glycocalyx.
slava [35]

Answer:

9Answer:

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Explanation0Explanation:

6 0
2 years ago
How does vasodilation relate to cell signaling?
Nataly [62]

Answer: Vasodilation of the arteries lowers blood pressure and decreases the force that the heart muscle needs to exert to pump blood., the cell signaling mechanism begins when $NO$ diffuses into the smooth muscle cells of the blood vessel and activates guanylyl cyclase.

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4 0
3 years ago
Compare and contrast the mechanisms of getting material across the plasma membranes of cells. Tells me what the mechanisms are i
stepladder [879]

Answer:

Materials get transported from the cell by some mechanisms such as Active Transport, Passive Transport, Diffusion, etc.

Explanation:

Active Transport :

It is a process by which, materials are transported from the extracellular membrane to the intracellular membrane with the help of ATP. It has a few types :  

Primary Active Transport :  

This system is standing upon the sodium-potassium pump. It moves out   Na⁺ from the cell and allows the entry of K⁺ into the cell. In this process ATP is a source of energy. E.g, Sodium-potassium pump.

Secondary Active Transport :

It is mainly standing upon Primary Active Transport. In this process, the main key point is the concentration gradient. There is already a concentration gradient set up by the primary active transport. This system uses that up and moves other substances against their own gradient concentration. E.g, assuming, there is a high concentration of sodium outside the cell,  if a route such as a channel or a carrier protein is open then sodium ions will move into the cell.  In this transport system, some cotransporters are used who move in the sodium ion into the sodium gradient.  

Passive transport :

It is a process by which, substances cross the plasma membrane without acquiring any energy from the cell. Here, no energy is needed because the substances are moving from higher concentration to its lower concentration. E.g, cell membrane or plasma membrane works as a permeable or semipermeable membrane.  

Diffusion :

It is the movement of a substance across a membrane, due to the concentration gradient, without any help from other molecules. E.g, movement of the gaseous molecule from cell to cell.

8 0
3 years ago
Who speculated that cells are living entities and plants are aggregates of cells?.
KengaRu [80]

Answer: the botanist Matthias Schleiden and the zoologist Theodore Schwann stated

Explanation: This Cell Theory has been influential in shaping the biological sciences ever since, in 1838/1839, the botanist Matthias Schleiden and the zoologist Theodore Schwann stated the principle that cells represent the elements from which all plant and animal tissues are constructed.

<h2>HOPE THIS HELP!!</h2>

8 0
2 years ago
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