The bed of capillaries in a vertebrate kidney where water, urea, and salts are filtered out of the blood is the __________.
a. Bowman's capsule
b. collecting duct
c. glomerulus
d. loop of Henle
e. proximal convoluted tubule
Answer: c. glomerulus
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When researchers calibrate the molecular clock they are
A. determining how much time it takes to accumulate a certain percentage of nucleotide changes. B. setting the geological time scale according to the position in which the fossil was found in the rock. C. investigating where the least common ancestor was found. D. generalizing about the amount of time between speciations. E. setting the geological time scale according to the position in which the fossil was found in the rock and investigating where the least common ancestor was found.
Famine, disease, and large-scale death are potential consequences of what?
a. long-term exponential growth b. long-term logistic growth c. constant growth rate d. fluctuating growth rate
Which of the following might be missed if viable counts are done on food and/or water specimens?
A. Pathogenic bacteria B. Aerobic bacteria C. Viable but nonculturable cells D. Endospores
Sickle-cell disease causes hemoglobin proteins to become altered. What direct effect does this have on red blood cells?
A. Red blood cells swell up, allowing fewer to flow through tiny capillaries and reducing blood flow. B. Red blood cells become sickle-shaped, clumping up and blocking blood flow in capillaries. C. Red blood cells shrivel up, causing too many of them to flow through capillaries at once, increasing blood pressure. D. Red blood cells become sickle-shaped, resulting in them carrying increased oxygen to body cells. Hyperoxia results.