When populations share a single habitat but are isolated by genetic or postzygotic mechanisms that prevent gene flow, what process can cause populations to diverge?
A) random mating
B) allopatric speciation
C) sympatric speciation
D) random mutation
E) gene duplication
C
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A scientist studying a material has determined that 12C, 13C, and 14C occur in the material in a ratio of 1000:10:1. How did he most likely differentiate between these forms of carbon?
A. by the number of protons in 12C, 13C, and 14C B. by the number of electrons in 12C, 13C, and 14C C. by the number of neutrons in 12C, 13C, and 14C D. by the biomasses of 12C, 13C, and 14C E. by the number of positrons in 12C, 13C, and 14C
Because glucose is a large molecule, it crosses the membrane through ____________________ diffusion. Fill in the blank(s) with the appropriate word(s)
Which of the following represents a biological consequence of irrigation of agricultural fields?
A) lowered water tables when wells are used B) introduction of fertilizers and pesticides into the water table C) transmission of diseases by aquatic organisms D) accumulation of salt in irrigated soils in arid zones E) environmental effects of engineered structures (dikes, wells, etc.)
Active transport requires the input of energy into a system so as to move solutes against their electrochemical and concentration gradients. Which of the following is not one of the common ways to perform active transport?
(a) Na+-coupled (b) K+-coupled (c) ATP-driven (d) light-driven