True or False: plants that possess high levels of xanthophylls are better suited to growth in bright sunlight
A. true
B. false
A
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Although Sulfolobus solfataricus grows at pH 2 to 4, it maintains a cytoplasmic pH of about 2, thereby generating a large pH gradient across the plasma membrane.
Answer the following statement true (T) or false (F)
The organisms believed to be the first to use two different photosystems in a single photosynthetic electron-transport chain are the:
A. yeast. B. archaea. C. cyanobacteria. D. algae. E. green plants.
What would be an easy way to determine if a skull is a mammal's skull?
A. Look for air sacs in the skull. B. Examine the teeth. C. Look for the remains of the tympanum. D. Measure the brain case volume.
Which of the following is a trigger for the other actions described?
a. Extracellular fluid volume is reduced. b. Solute concentration in the extracellular fluid rises above a set point. c. Posterior pituitary secretes ADH. d. Distal tubules of the nephrons and the collecting ducts become more permeable to water. e. A small amount of concentrated urine is excreted