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kari74 [83]
3 years ago
12

Which of the following describes our current solar system model?

Biology
1 answer:
andrew-mc [135]3 years ago
6 0
The planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune revolve around the sun (a star), and these planets have moons that revolve around them.

Answer:
<span>Planets revolve around a star, and moons revolve around planets.

Hope this helps.</span>
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What would happen to individual muscles if muscle cells failed to function properly?
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I am pretty sure that if muscle cells failed to function properly the thing that would happen is being revealed by the first option : A. The muscles will not work. I choose this one because as you know muscles are made of muscle tissue and if cells fail it won't functionate at all.

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The spinal cord is made up of
skelet666 [1.2K]

Answer:

Grey and White Matter.

Explanation:

When looking at an image of trasnverse section of the spinal cord the grey matter is almost butterfly shapped and it has the central canal in the middle. The white matter is surrounding the butterfly shaped, grey matter.

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Define photosynthesis for 2 marks<br>​
8_murik_8 [283]

Answer:

Explanation:

the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.

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3 years ago
g Identify the statements that accurately describe how hydrogen ion concentration relates to energy production in oxidative phos
masha68 [24]

Answer:

- Hydrogen ion concentration is lower in the mitochondrial matrix than in the intermembrane space.  

- Oxidative phosphorylation relies on the hydrogen ion concentration gradient generated and maintained by the electron transport chain.  

- Hydrogen ions enter the mitochondrial matrix via facilitated diffusion.

Explanation:

Oxidative phosphorylation is a metabolic pathway by which Adenosine Triphosphate (ATP) molecules are produced through the transfer of electrons from NADH or FADH2 to molecular oxygen (O2). The hydrogen (H+) ions are pumped from the mitochondrial matrix to the intermembrane space, and this movement of protons generates an electrochemical gradient across the mitochondrial membrane which is used by the ATP synthase to produce ATP. This gradient is generated by the movement of electrons through a series of electron carriers (e.g., cytochrome c and ubiquinone) that are embedded in the inner mitochondrial membrane. The movement of these H+ ions across the semipermeable mitochondrial membrane moving down their electrochemical gradient is named chemiosmosis and is an example of facilitated diffusion.

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How do feedback signals affect the cell cycle ?
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The cyclins activate the CDKs, which affect the cell cycle at three important checkpoints: Late in the G1 stage of the cell cycle, triggering the cell to move into the S phase.

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