Which genus is the most common resident flora of mouth surfaces?
A. Mycobacterium
B. Streptococcus
C. Haemophilus
D. Escherichia
E. Lactobacillus
Answer: B
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Mutations in which of the following genes lead to transformations in the identity of entire body parts?
A) morphogens B) segmentation genes C) egg-polarity genes D) homeotic genes E) inducers
What evolutionary force is definitely not responsible for generating the obvious differences between races?
A. genetic drift B. natural selection C. sexual selection D. gene flow
Digger wasps orient using
A. pheromones. B. sight. C. solar bands. D. smell. E. pheromones and solar bands.
Which of the following statements is false?
a. Whales use their jaws to hear. b. Whales lack a pair of middle ears. c. Killer whales use echolocation and have ears that are sensitive to high-frequency sounds. d. Humpback whales emit very low-pitched sounds that travel long distances underwater. e. Sound waves are transmitted through a layer of fat before being transduced in whales.