There are 2 types of transport mechanisms that involve the movement of materials across the cellular membrane:
1. Passive Transport Mechanisms which is the movement of materials that does not require energy. Instead the movement relies on the permeability of the cell. Under this are three kinds of passive transport mechanisms:
a. Simple Diffusion:
- the movement of materials from a region of higher concentration to lower concentration. No external energy is necessary for the movement. The materials supply the energy themselves.
b. Facilitated Diffusion:
- This differs from simple diffusion because the movement is facilitated by proteins that make up the structure of the membrane. The proteins include channel proteins that allow ions and smaller molecules to cross the membrane. The other protein are the carrier proteins, which bind to materials like sugar molecules and move it across the membrane.
c. Osmosis:
- This is the diffusion of water across the membrane. Osmosis moves water from regions where there are more water molecules of water per volume to regions where there are less water molecules per volume.
2. Active transport on the other hand is a movement mechanism that requires energy. It uses the energy to send materials against the direction it is coming from through simple diffusion. This mechanism is used in a way to keep unwanted ions or other materials out of the cell.
Prokaryotic: before nucleus, no membrane bound organelles, and single celled microscopic organisms
eukaryotic: true nucleus, has membrane bound organelles, and multi cellular or unicellular organisms
therefore it would be letter <span>B. cell membrane and cytoplasm</span>
Answer:
A&B
Explanation:
Plants will thrive and Bacteria will thrive
Answer:
The given statement is True.
A human body is composed of around 60 percent of water, the average range is around 50-65 percent.
Water is a vital nutrient for any living organism including human beings.
Being a universal solvent, it primarily helps in metabolism and transportation of proteins and carbohydrates in our body.
It helps in maintaining the internal body temperature through respiration and sweating.
It helps in excretion of waste material through urination.
It lubricates joints and acts as shock absorbent for the fetus, spinal cord, and brain.
Im pretty sure they repel from the charged protons
