Ethology is the study of ________
a. how animals process information
b. genetic mechanisms that underlie behavior
c. the adaptive value of behaviors
d. how animals behave in their natural environment
e. physiological mechanisms that underlie behavior
D
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All of the following are found in bacterial cells EXCEPT
a. ribosomes. b. genetic material. c. cell wall. d. mitochondria.
Heartburn is caused by the ____
a. gastroesophageal sphincter remaining too tightly closed b. gastroesophageal sphincter remaining a bit open c. pyloric sphincter remaining too tightly closed d. pyloric sphincter remaining a bit open e. the gastroesophageal and the pyloric sphincters remaining too tightly closed
How small is the smallest object that can be seen with a light microscope?
a. 2 µm b. 0.2 µm c. 2 nm d. 0.2 nm
You compare homologous nucleotide sequences among several pairs of species with known divergence times. A pair of species that diverged 1 million years ago has two nucleotide differences, a pair that diverged 2 million years ago has four nucleotide
differences, and a pair that diverged 3 million years ago has six nucleotide differences. You have sequence data for another pair of species for which the divergence time is unknown. There are five nucleotide differences between them. Based on your clock, when did their line of ancestry diverge? A) 3.5 million years ago B) 3 million years ago C) 2.5 million years ago D) 2 million years ago