All the living organisms in a particular area at a particular time make up a
a. population.
b. community.
c. ecosystem.
d. biosphere.
e. biosystem.
B
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Which of the following statements is true regarding subduction?
A. It adds new crust to Earth's surface via volcanic activity. B. It is unrelated to Earth's plate tectonics. C. It permanently removes carbon from Earth's surface. D. It permanently adds carbon to Earth's atmosphere. E. The carbon it removes is eventually returned to the atmosphere by volcanism.
What is the function of urea reabsorption in the collecting ducts of the kidney?
A) It restores the correct concentration of blood urea. B) It increases the osmotic concentration of the interstitial fluid in the renal medulla so that more water can be extracted from the urine. C) It reduces the salinity of the renal medulla and thus helps regulate how much water is reabsorbed from the urine. D) It moves the urea into the ascending limb of the loop of Henle so that it can be excreted from there in the urine.
Which option correctly lists the sequence in which most animals develop?
A) zygote, cleavage, blastula, gastrula, organ formation B) cleavage, zygote, gastrula, blastula, organ formation C) zygote, cleavage, gastrula, blastula, organ formation D) zygote, cleavage, organ formation, blastula, gastrula
Where is the majority of ATP generated in prokaryotic cells?
A) in the cytoplasmic membrane B) in the cytosol C) in the thylakoids D) in the inner mitochondrial membrane E) on ribosomes