Of which materiais is cartilage composed?
A. glycoproteins and calcium phosphate
B. glycoproteins and collagen fibers
C. collagen fibers and osteocytes
D. osteocytes and glycoproteins
E. osteocytes and calcium phosphate
B. glycoproteins and collagen fibers
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Why do plants use cotransporters instead of ion channels to transfer anions into cells?
A) Cotransporters are able to transfer anions against the membrane potential gradient, but ion channels cannot. B) Cotransporters can transfer ions across cell membranes, but ion channels cannot transport ions across cell membranes. C) Cotransporters are able to transfer anions against the proton gradient, but ion channels cannot. D) Anions are too bulky to be transported by ion channels.
Which of the following statements is false?
A) All organisms consist of one or more cells. B) All cells arise from preexisting cells. C) The cell is the basic unit of structure for all organisms. D) All cells have a membrane-bound nucleus. E) Cells come in a wide variety of sizes and shapes.
Refer to Figure 31-6. The structures labeled 3 are involved in:
A. reproduction. B. respiration. C. excretion. D. sensory pathways. E. movement
During the formation of a blood clot, conversion of prothrombin into the enzyme thrombin requires
A) mitochondria. B) transport of proteins from platelets. C) calcium ions. D) leukocytes. E) albumin.