Answer:
Ions, sugars, amino acids, and sometimes water
Explanation:
Those substances are unable to diffuse across the membrane, so they use an ATP-powered ion pump, channels, and transporters to be transported across the membrane.
Answer:
Explanation:
A cell can be compared to any organism that counts on different parts that have to fulfill their role for the sake of t's correct functioning, ex: a factory, a machine.
A cell can be compared to the school because every organel has a function to fulfill in order to keep the whole cell functioning in the right way. If any of the organells fails, the cell itself has to check what is wrong with it, and if the problem persists, the cell may die or replace it. The same happens with the school, it counts on different parts (teachers, directives, etc.) and if any of those parts fails, it has to be replaced before the structure itsellf gets damaged.
The signal will start from the eyes. The message is carried by sensory neurons to the spinal cord. There, the "impulse" will transfer to motor neurons which will carry it to the brain. So in short:
Sensory neurons --> spinal cord --> motor neurons --> brain
Answer:
Explanation:
The nucleolus makes rRNA, which makes up ribosomes. The Golgi apparatus gets vesicles of proteins from the ER (which contains ribosomes) to process, sort, and ship the proteins to where they are needed. The rough endoplasmic reticulum and the cytoplasm houses the ribosomes.
