Cellular Processes

The difference between active and passive transport is that

• active transport requires energy to move molecules up a concentration gradient, and passive transport does not.

• passive transport requires energy to move molecules up a concentration gradient, and active transport does not.

• active transport moves molecules in animal cells, and passive transport moves molecules in plants.

• passive transport can only move specific particles across a membrane, and active transport can move any particle.

Which of the following scenarios represent examples of osmosis?

• Spraying perfume in the air.

• Limp celery becomes crisp in water.

• Blood vessels transport glucose to cells.

• Wrinkled fingers from excessive exposure to water.

Both osmosis and diffusion --

• happen only in living cells and tissues.

• require energy to move substances.

• only move substances from high to low concentration.

• require a membrane for substances to move across.

The word homeostasis means --

• a reaction that absorbs energy.

• ability to maintain and regulate stable internal conditions of the cell.

• process modifying the molecular structure of a protein.

• a chemical that increases the rate of a chemical reaction without itself being changed by the reaction

One way materials enter and leave a cell is by --

• Osmosis

• Glycolysis

• Cytokinesis

• Diffusion

The rate at which molecules, such as water and oxygen, enter a cell is determined by the --

• mass of the nucleus.

• primary function of the cell.

• permeability of the cell membrane.

• size of the cell.

What happens to osmotic pressure in a cell if it is placed in a hypotonic solution?

• Osmotic pressure decreases because solutes enter the cell by passive transport.

• Osmotic pressure increases because solutes exit the cell by facilitated diffusion.

• Osmotic pressure increases because solutes exit the cell by facilitated diffusion.

• Osmotic pressure increases because water enters the cell by osmosis.

Cells have semipermeable membranes that-

• release ATP during the process of cellular respiration.

• capture light energy in order to perform photosynthesis.

• regulate the movement of material into and out of the cell.

• are the organelle responsible for cellular metabolism.

A wilting flower placed in water will be revived as water pressure in the plant cells increases. This change is brought about as a result of what process?

• Vessels transporting glucose to cells

• Cells pulling in water via osmosis

• Carbon dioxide waste eliminated during respiration

• Oxygen leaving the cell by transpiration

Sugar molecules can be transported across the cell’s plasma membrane with the help of which biomolecules?

• Proteins

• Lipids

• Carbohydrates

• Nucleic acids