Which statement best describes active transport?
A. A substance goes from an area of high concentration to an area of low concentration, and this releases energy.
B. A substance goes from an area of low concentration to an area of high concentration, and this releases energy.
C. A substance goes from an area of high concentration to an area of low concentration, and this requires energy.
D. A substance goes from an area of low concentration to an area of high concentration, and this requires energy.
Answer: D
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Choose the true statements about molecular clocks.
_____ All molecular clocks tick at the same rate. _____ Molecular clocks can be calibrated using fossil evidence. _____ The rate of a molecular clock for a given DNA character might vary depending on how constrained the character is by natural selection. _____ Ultimately, all molecular clocks depend on the rate of DNA mutation and DNA repair mechanisms.
Helicobacter pylori can survive the acidic conditions of the human stomach and have been found to cause the development of stomach ________
Fill in the blank(s) with correct word
Which one of the following processes tends to mix gene pools?
A) gene flow B) the bottleneck effect C) founder effect D) continental drift E) adaptive radiation
Nondisjunction in humans can result in
A. 22 pairs of autosomes, an X chromosome and a Y chromosome. B. 22 pairs of autosomes, and two X chromosomes. C. 47 chromosomes. D. 46 chromosomes.