Answer:
D (proteins moving ions from low to high concentration across a cell membrane)
Explanation:
Active transport, by definition, is a type of substance transport that requires energy (typically in the form of ATP). Having said that, we can immediately eliminate B (aka water diffusion throughout the cytoplasm of a cell), as diffusion (osmosis in this case) does not require any expenditure/spending of energy. Next, we can cancel A and C because although they do require energy, there is no transport involved. Thus that leaves us with D. D is not only the answer because of the process of elimination but also b/c the ans. choice says that ions are being moved from low to high concentration, which is against the concentration gradient and thus requires energy. Hope you found this helpful! :)
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Muscle Cells are known to have the greatest number of mitochondria.
Acne is to excessive secretion of oil
Answer:
Tissue
Explanation:
The levels of organization go as follows:
Atom - the building blocks of all living and nonliving material
Molecule - two or more atoms that join together in chemical bond
Organelle - two or more molecules working together to perform a particular function in a cell
Cell - the smallest unit that exhibits all of the characteristics of life
<u>Tissue - two or more cells that work together to perform a particular function</u>
Organ - two or more tissues that work together to perform a particular function
Organ System - two or more organs that work together to perform a particular function
Multi-Celled Organism - two or more organ systems that work together
