The mitochondrial genome would be most useful for studying evolutionary relationships among which group of organisms?
A. whales (members of the order Cetacea)
B. animals (members of the kingdom Animalia)
C. plants (members of the kingdom Plantae)
D. eukaryotes (members of the domain Eukarya)
E. all organisms (members of domains Bacteria, Archaea, and Eukarya)
A. whales (members of the order Cetacea)
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Which of the following statements about bird respiration is false?
A. Air flowing through the air channels in the lungs moves in the opposite direction of blood flowing through the blood capillaries in the lungs. B. Oxygen is exchanged between the air and the bloodstream in the lungs, but not in the air sacs. C. The unidirectional flow of air through a bird's lungs maintains a larger concentration gradient for diffusion than can be obtained through tidal breathing. D. Bird lungs receive fresh air during both inhalation and exhalation. E. It takes two ventilation cycles for a single breath of air to move through a bird's respiratory system.
This molecule of starch is different from a glucose molecule in that this molecule
A. is used by cells for long-term storage and release of energy for cell functions.
B. is a complex carbohydrate polymer.
C. has the same characteristics of glucose.
D. is used by cells for quick release of energy for cell functions.
E. can provide structure for cells that contain it.
Compared to white muscle fibers, red muscle fibers ____
a. have fewer mitochondria b. have less myoglobin c. make more ATP by lactate fermentation d. fatigue less easily e. get most of their ATP from creatine phosphate
Plants photosynthesize _____
A) only in the light but respire only in the dark B) only in the dark but respire only in the light C) only in the light but respire in light and dark D) and respire only in the light