Cell membranes

Most cell organelles play some role in cell reproduction. Without which organelle would reproduction be impossible for eukaryotes?

• Golgi apparatus

• mitochondrion

• chloroplast

• nucleus

All cells are surrounded by membranes. The main role of the cell membrane is to

• regulate the cell's interactions with the environment.

• release any type of molecule out of the cell.

• arrange the cell's organelles in the cytoplasm.

• prevent water from leaking out of the cell.

In the diagram above, some molecules move across the cell membrane, but other molecules cannot cross the membrane. Some molecules can cross, but others cannot because the

• cell is alive

• molecules are polar

• membrane is semipermeable

• cytoplasm is salty

What type of molecule embedded in the cell membrane allows larger molecules to pass through the membrane by active transport?

• phospholipids

• proteins

• ATP

• carbohydrates

Osmosis is the movement of water across a cell membrane. In osmosis, water molecules move between phospholidips and toward areas that have a lower concentration of water molecules. Osmosis is a type of

• diffusion.

• facilitated diffusion.

• active transport.

• fluid mosaic model.

Some molecules embedded in the cell membrane allow large particles to enter or leave the cell. If the embedded molecules does not require energy to move a particle across the membrane, it is taking part in

• diffusion

• facilitated diffusion

• active transport

• random movement