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Of course not! There's lots of ways materials can enter. It also depends on the cell; whether it has cell wall and cell membrane or only cell membrane.
Besides diffusion, there's also osmosis and active transport.
If the cell has only cell membrane, it means it's partially permeable, which means osmosis can happen.
*hope this helps :)
It would be D. because thick fur and dense fur are the same and keep the animals warn. Production does not help prevent heat loss.
Answer:
Prions are infectious agents which are responsible for neurodegenerative diseases in animals. Prions cause the refolding of the alpha helical and coil forms of protein structure into beta sheets.
Explanation:
The alpha sheets and coil structures assume <u>helical structures</u> and therefore would give different physiological properties to protein. When they are converted into beta sheets, which are <em>flat and parallel</em>, the structure and function of the protein get altered.
The cellular form of the protein is sensitive to proteases whereas the misfolded protein is <em>not affected</em> by proteases. The misfolded form perpetuates itself by causing the newly synthesized normal form of protein to become <u>degenerate</u>.
<em>Kuru</em> was the first disease caused by prion in humans.,