Most biologists agree that the most recent common ancestor of all animals was probably a ____, an idea first proposed
by Ernst Haeckel in 1874.
a. jellyfish
b. ciliated protozoan
c. sessile sponge
d. single-celled chytrid
e. colonial, flagellated protist
ANSWER: a
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Which of the following statements regarding the loss of biodiversity is false?
A. Earth is losing 2.5% of its species annually. B. There will be fewer species at the end of the 21st century than there are now. C. Loss of biodiversity results in the loss of novel compounds with potential medical applications. D. Loss of biodiversity may result in less productive and resilient communities. E. Habitat degradation is one of the most important threats to biodiversity.
When molt-inhibiting hormone secretion (MIH) is prevented, ____
a. ecdysone levels increase b. ecdysone levels decrease c. molting is inhibited d. growth is inhibited e. growth is stimulated
In which of the following ways is proteobacterial photosynthesis different from plant photosynthesis?
a. Proteobacterial photosynthesis uses a different type of chlorophyll. b. Proteobacterial photosynthesis does not produce oxygen. c. Proteobacterial photosynthesis uses water as an electron donor. d. Proteobacterial photosynthesis uses a different type of chlorophyll and does not produce oxygen e. Proteobacterial photosynthesis occurs in the dark.
A change in a population that is NOT related
strictly to the size of the population is best described as
a. density-dependent. b. density-independent. c. biotic. d. logistic. e. exponential