Prokaryotic cells don't have a nucleus
A- Temperature.
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Answer:
Tigers are often poached for their parts, used in traditional __chinese_____ medicine.
Explanation:
Traditional Chinese medicine for over a thousand years has used the strength of the tiger to cure various physical and spiritual ailments. For this they need parts of the tiger such as their eyes, bones, teeth etc.
Below are some of the ailments treated:
-Tiger claws: It is used as a sedative for insomnia.
-Teeth: They are used to treat fever.
-Fat: It is used to treat leprosy and rheumatism.
The tiger is in danger of extinction, but they are still hunted to be used in medicine
The answer is PRODUCERS.
Plants are producers and perform photosynthesis.
They use the sunlight, that provides them with energy, and take the carbon dioxide from the atmosphere, that helps reducing it.
Photosynthesis is a way for them to make their own food (sugars), necessary for them to stay alive and to produce oxygen. Both will be needed for their cellular respiration, a process that occurs in the mitochondria, and will produce energy, in the form of ATP, and CO2.
The carbon dioxide that they produced in cellular respiration can be used for photosynthesis.
Answer:
The correct answer is: a. True.
Explanation:
There are several membrane transport systems responsible for the passage of ions like Na+ and K+.
Cell membranes are semipermeable, which means they can regulate which molecules may and cannot flow through them. Some molecules may simply drift in and out of a cell (this is called simple diffusion), while others require specific structures to enter and exit (this type of diffusion is called facilitated diffusion), and still, others require an energy boost to pass the cell membrane (this is known as active transport).
Both simple diffusion and facilitated diffusion are types of passive transport: they happen without the energy boost that ATP gives, unlike active transport.
In passive transport, molecules follow their chemical gradients and travel through the most concentrated compartment to the less concentrated one to equal the concentrations. In active transport, on the other hand, the cell makes an effort to enter or exit ions against their chemical gradients and this is done particularly to maintain said gradients (they are required for the correct functioning of the cell).
Sodium and Potassium are two of the most important ions when it comes to maintaining these gradients: sodium is very concentrated in the outside of the cells (the extracellular compartment), while potassium is highly concentrated in the intracellular compartment. These differences in concentrations are maintained thanks to the Na+/K+ pump, a form of active transport. Apart from the Na+/K+ pump, these ions go through the membrane through passive transport as well, without requiring energy.
