Question

the diagram models the time - lapse movement of particles across a cell membrane. the particles have characteristics that allow them to pass freely across the membrane.
particles crossing a membrane over time
time 1 time 2 time 3
which two of the statements describe the particles or their movement based on the time - lapse diagram.
a the movement across the membrane requires energy from atp.
b the movement across the membrane requires energy from glucose.
c the movement across the membrane does not require added energy.
d the particles crossing the membrane could be larger molecules like proteins or carbohydrates.
e the particles crossing the membrane could be carbon dioxide (co₂) or oxygen (o₂).

Explanation:

The diagram shows particles moving from an area of higher concentration to lower concentration across a membrane without the help of energy - related molecules like ATP or glucose, which is simple diffusion. Small non - polar molecules like oxygen ($O_2$) and carbon dioxide ($CO_2$) can pass freely through the cell membrane by simple diffusion. Larger molecules like proteins and carbohydrates generally do not pass freely through the membrane by simple diffusion.

Answer:

C. The movement across the membrane does not require added energy
E. The particles crossing the membrane could be carbon dioxide ($CO_2$) or oxygen ($O_2$)