How do low-density lipoproteins (LDLs) move into cells?
A. LDLs diffuse through channels in the membrane.
B. LDLs are engulfed through receptor-mediated endocytosis.
C. LDLs diffuse through the phospholipid bilayer.
D. LDLs are transported through a pump that is also an ATPase.
B
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Which of these proteins functions to store or transport iron?
A) hemoglobin B) ferritin C) hemosiderin D) transferrin E) ferritin, hemosiderin, and transferrin
How are the phospholipids arranged to form the plasma membrane?
Single layer with hydrophilic heads outward Double layer with hydrophobic tails facing inward toward each other Double layer with hydrophilic heads facing inward toward each other Double layer with phospholipids on the outside and proteins on the inside
Osteoarthritis is
A. a bacterial infection transmitted by ticks. B. an inflammation of any joint. C. a metabolic disorder caused by increased uric acid in blood. D. a condition that may involve an autoimmune disease. E. the most common type of arthritis.
Which region of the digestive tract moves material by peristalsis, haustral churning, and mass movement?
A. Large intestine B. Esophagus C. Pharynx D. Small intestine E. Stomach