Filamentous microbial mats in anoxic, sulfide-rich cave springs are dominated by members of the ________.
A. epsilon proteobacteria
B. beta proteobacteria
C. alpha proteobacteria
D. delta proteobacteria
Answer: A
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A scientist is studying a population of feral cats in his city. After ten years, he notes that—for the population of feral cats he is studying—(K–N)/K = 0
Based on this information, what can he deduce about the logistic growth curve for the population at this point in time (recall Figure 46.5)? A. The curve resembles an exponential growth curve. B. The curve is at its inflection point (i.e., the rate of growth has started to slow). C. The curve has plateaued at K. D. The curve is at its steepest point.
A recognized set of symptoms that characterize a genetic disorder is a(n) _____
a. syndrome b. disease c. abnormality
Somatostatin is secreted by
a. pancreatic islet cells. b. the thyroid gland. c. the pituitary gland. d. the adrenal medulla. e. the adrenal cortex
What type of tissue transports sugars (the product of photosynthesis) throughout the plant?
A) Parenchyma B) Phloem C) Xylem D) Collenchyma E) Endodermis