The most dangerous type of arrhythmia is
a. tachycardia.
b. ventricular fibrillation.
c. brachycardia.
d. atrial fibrillation.
e. an electrocardiogram.
Answer: b
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Which of the following is a false statement about plant secondary metabolites?
A. Some can be used to treat human diseases. B. Some can be poisonous to humans. C. The activity of certain medicines is due to secondary metabolites. D. Some of them can cross the placenta during pregnancy. E. They are too unpredictable to use in pharmaceutical research.
One theory holds that complex molecules formed on clay. This is because clay attracts
a. oxygen. b. lipids. c. nucleic acids. d. amino acids. e. carbon.
A volcanic eruption carves the island into two populations (A1 and A2, 50,000 individuals each). The rodents cannot cross the lava even when it has cooled
Immediately after the eruption you take 100 individuals from each of populations A1 and A2, and sequence the same 100 base-pair gene region in the mitochondrial DNA (mtDNA) of each individual. You are shown a DNA sequence chosen at random from the total pool of 200 sequences; can you tell which population, A1 or A2, it comes from? A. yes B. no
Research by Christopher Cullis has shown that
a. the genome size of plants varies little between species. b. the genome size of individual plants of the same species is constant. c. a plant’s environment can act as a selective agent to establish advantageous variants, but these variants cannot be transmitted to the next generation. d. a plant’s environment can act as a selective agent to establish advantageous variants, and these variants can be transmitted to the next generation. e. the genome size of plants is related to plant size.