Biology Chapter 3.4-5

Cells require ______ in active transport to transport molecules across the membrane.

• energy

• homeostasis

• passive

Moving substances across a concentration gradient means moving substances from _____ to ______.

• high to low

• low to high

• left to right

Phagocytosis and pinocytosis are types of _________ __________ ____________.

• diffusion osmosis ion

• active transport endocytosis

• facilitated diffusion vesicle

During active transport, a cell uses energy to move substances ______ a concentration gradient.

• under

• down

• up

• right

_________ refers to cells maintaining a constant internal environment.

• Exocytosis

• Homeostasis

• Vesicle

________ transport requires no energy from the cell.

• diffusion

• osmosis

• passive

______ is the process when a vesicle fuses with the cell membrane and releases its contents outside the cell.

• Exocytosis

• homeostasis

• osmosis

Water moves into the cell when the solution surrounding the cell is _______.

• H2O

• hypotonic

• facilitated diffusion

Osmosis is the diffusion of _______ across a cell membrane.

• vesicle

• H2O

• ion channels

___ ___ is the type of passive transport where molecules move down a concentration gradient using transport proteins.

• active transport

• facilitated diffusion

• bigger doorway