One symptom of kidney failure can be the appearance of blood in the urine. This would indicate that which part of the kidney was damaged?
A. proximal convoluted tubule
B. distal convoluted tubule
C. glomerulus
D. nephron
E. collecting duct
C. glomerulus
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An operon is a useful genetic element, because it
A) encourages the binding of RNA polymerase. B) allows coordinated expression of multiple related genes in prokaryotes. C) translates DNA sequence into amino acid sequence. D) encourages the binding of ribosomes in the correct location.
Two populations of birds with somewhat different coloration live on opposite sides of a peninsula. The habitat between the populations is not suitable for these birds. When birds from the two populations are brought together, they produce young whose appearance is intermediate between the two parents. These offspring will breed with each other or with birds from either parent population, and all offspring of these pairings appear intermediate to various degrees. The two populations are _____.
A. different subspecies, under the morphological species concept B. different species, under the biological species concept C. different species, under the phylogenetic species concept
Which type of neuroglia is found outside of the brain?
A. microglia B. axons C. astrocytes D. Schwann cells E. oligodendrocytes
Which is another name for bone cells that remain alive even after the extracellular matrix becomes hardened with calcium phosphate crystals?
A. leukocytes B. fibrocytes C. chrondrocytes D. erythrocytes E. osteocytes