Cell and Molec 2 - Exam Review 1

Which of these structures give eukaryotes their distinct function?

• Plasma Membrane

• Mitochondria

• Endoplasmic Reticulum (ER)

• Flagellum

• Golgi Apparatus

Which best describes the phospholipid heads?

• Hydrophilic

• Hydrophobic

• Amphipathic

Which fatty acid is more fluid?

• Saturated fatty acid

• Unsaturated fatty acid

Describe the direction of movement for facilitated diffusion

• High to low

• Low to high

• Both directions

Describe the direction of movement for active transport

• High to low

• Low to high

• Both

Which of these signals open gated channels?

• Voltage

• Protein

• Chemical

• Lipid

• Mechanical

What opens passive channels?

• Random opening

• Chemical signals

• Voltage changes in the bilayer

What molecules are needed for the Na, K-ATPase pump

• ATP

• Glucose

• Na+

• K+

What determines membrane potential?

• Differences in ion concentration and permeability of the plasma membrane

• Differences in ion concentration

• Permeability of the plasma membrane and channels to transport ions

• Differences in ion concentration and ions available for the cell to use

What is an action potential?

• The membrane potential going negative

• Rapid, large alterations in the membrane potential

• The membrane potential going positive

• Slow, deep changes in the membrane potential