The human oral flora consists of
A) a small group of phylogenetically related aerobic microorganisms.
B) diverse aerobic and anaerobic microorganisms.
C) monoculture biofilms on tooth surfaces.
D) the same phyla that are found in the human gut.
Answer: B
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You track aquatic coastal levels of nitrogen and phosphorus at high latitudes and notice a sharp increase in the winter and then again in the spring. What do you expect the effect of these nutrient increases will be on the plankton populations?
A. sharp spikes in population levels at essentially the same time (or, in phase) with the spikes in nutrients B. sharp spikes in population levels some time after (or, out of phase) with the spikes in nutrients C. a sharp spike in population levels in the spring, when light levels are higher; not much of a response in winter D. no effect of the changes in nutrient concentration on the plankton populations in either winter or spring
Stomata open in response to light when _____
a. guard cells pump ions into their cytoplasm b. guard cells pump ions out of their cytoplasm c. water evaporates out of guard cells
matching the descriptions with the
most appropriate group listed below. a. Bacteria b. Protista c. Plantae d. Fungi e. Animalia E 88. multicellular producers E 89. prokaryotic M 90. unicellular organisms of considerable internal complexity M 91. multicellular motile consumers E 92. oldest living organisms M 93. unicellular producers M 94. multicellular decomposers
What is the animal in the accompanying figure?
a. mosasaur b. plesiosaur c. pterosaur d. thecodont e. ichthyosaur