Biology Unit 3- Cell Transport and Homeostasis

Both prokaryotic and eukaryotic cells have:

• plasma membrane and cytoplasm

• organelles and cytoplasm

• nucleus and ribosomes

• nucleolus and ribosomes

A major hydrophobic component in the cell membrane is the:

• protein pumps

• phospholipid bilayer

• protein pumps

• carbohydrate gases

During passive transport, molecules move:

• from areas of low concentration to areas of high concentration

• from areas of high concentration to areas of low concentration

• against the concentration gradient

• only through selectively impermeable membranes

The movement of water molecules across a selectively

permeable membrane is known as:

• exocytosis

• diffusion

• endocytosis

• osmosis

Proteins made by free-floating ribosomes

• always go to the nucleus

• stay in the cell

• leave by secretory vesicles

Which of the following is NOT an example of active transport?

• facilitated diffusion

• osmosis

• diffusion

• all of the above

Proteins that travel through the endomembrane system:

• remain in that cell

• always go to the nucleus

• leave by secretory vesicles

Ions moving against a concentration gradient through

• passive transport

• osmosis

• simple diffusion

• active transport

The energy required for active transport comes from

• ATP

• mRNA

• protein

• lipid

Exocytosis is possible through

• transport vesicles

• osmosis

• cell signaling

• bringing substances into the cell