The underlying problem with cystic fibrosis is
A. the inability to transport chloride ions.
B. mutations in the hemoglobin molecule.
C. defective ganglioside molecules.
D. the inability to metabolize certain amino acids.
E. abnormal fat deposits around the heart.
A
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In humans, the diaphragm divides the coelom into the ________ cavity above and the ________ below
a. upper thoracic / abdominal and pelvic cavities b. cranial / upper thoracic cavity c. spinal / abdominal cavity d. abdominal / upper thoracic and pelvic cavities
Consider a U-tube that initially contains pure water on one side of a selectively permeable membrane
and water plus solute on the other side. Which of the following best describes what will happen next? a. Solute molecules diffuse across the membrane faster than water molecules. b. The fluid level rises on the side containing the pure water. c. The diffusion of water molecules causes an osmotic pressure to build up in the tube. d. Solute molecules are transported across the membrane by facilitated diffusion. e. Some water molecules become "bound up" with solute molecules and do not diffuse freely.
The separation of homologous chromosomes is called
A. synapsis. B. segregation. C. mitosis. D. fertilization.
A snail in your garden and an oyster are quite different in appearance. What would be evidence to justify grouping them together?
A. Both use siphons to obtain oxygen. B. Both use a radula for feeding. C. Both have sensory antenna. D. Both have a mantle capable of secreting calcium carbonate.