which of the following are true for simple diffusion?

this is typical for large molecules.

it is how oxygen and carbon dioxide travel across the cell membrane.

it is how glucose travels across the cell membrane.

it is a form of passive transport.

molecules travel with the concentration gradient.

question 2
endocytosis and exocytosis, in which large substances are bulk transferred, are forms of
facilitated diffusion

active transport

osmosis

passive transport

question 3
when water travels across the cell membrane through protein channels at a substantial rate, it is a type of

facilitated diffusion

osmosis

active transport

passive transport

Answers:

It is how oxygen and carbon dioxide travel across the cell membrane

Molecules travel with the concentration gradient

Explanation:

In simple diffusion, molecules move from an area of high concentration to area of low concentration until equilibrium is achieved. This occurs randomly unlike in facilitated diffusion where this flow is regulated through channels by facilitators. Nonetheless, these molecules still travel down the concentration gradient, similar to simple difussion.

Active transport

Explanation:

In this type of transport, energy is required. This is especially because, in endocytosis and exocytosis, the membrane has to form some structure (some form of a vessicle) to facilitate these transport modes. This requires energy from ATP. More so, usually transport in this case is against concentration gradient.

Osmosis.

Explanation:

Osmosis is the movement of water from a lower concentrated solution to a higher concentrated solution through a semi-permeable membrane. In this case, the cell membrane has pores that allow only water molecules to pass through but the solute molecules are too large to pass through. Therefore only water is moving down its concentration gradient.

the scientific method.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.