QUIZZEZ For EXAM 3 – BIOQUIMICA: QUIZZ 1 (#7)

Which process does NOT require energy?

• Active transport

• Facilitated diffusion

• Primary active transport

• Coupled transport

Phospholipids are considered amphipathic because:

• They are hydrophobic

• They are hydrophilic

• They contain both hydrophobic and hydrophilic regions

• They dissolve easily in water

What is the main role of antidiuretic hormone (ADH)?

• Increase urine production

• Decrease water retention

• Increase water retention

• Stimulate milk production

Which hormone is primarily synthesized by the adrenal glands during pregnancy?

• Androgens

• Estradiol

• Progesterone

• Testosterone

Which condition is caused by cortisol excess?

• Addison's disease

• Hypothyroidism

• Cushing syndrome

• Diabetes insipidus

What component of the phospholipid is hydrophilic?

• Fatty acid tails

• Glycerol

• Phosphate head

• Hydrocarbon chains

Active transport moves molecules:

• Down their concentration gradient

• Along their electrochemical gradient

• Against their concentration gradient

• In random directions

The presence of double bonds in the fatty acid tails of phospholipids results in:

• Increased membrane fluidity

• Decreased membrane fluidity

• More stable membranes

• No effect on fluidity

The plasma membrane's selective permeability primarily allows which substances to cross easily?

• Proteins

• Carbohydrates

• Oxygen, nutrients, and waste

• Ions

How do small, nonpolar molecules cross the membrane?

• Via transport proteins

• By active transport

• By diffusing through the lipid bilayer

• Through protein channels