The answer is nucleic acid
Molecules such as glucose and amino acids can be absorbed from the digestive tract and a renal tubule by the process of facilitated diffusion, which involves a carrier protein that can transport a molecule across the cell membrane down its concentration gradient. The process involves a process of spontaneous passive transport of molecules or ions across a biological membrane via specific trans-membrane integral proteins.
Answer:
problems actually start when some of the prion proteins get misfolded into a form that aggregates (the infectious form), which also induces misfolding in the native protein, increasing the amount of aggregates, and inducing more and more of the native form to misfold.
Explanation:
D. geotropism. Phototropism is the response to light, hydrotropism is the response to moisture, and thigmotropism is the response to a touch stimulus