A terrestrial animal species is discovered with the following larval characteristics: exoskeleton, system of tubes for gas exchange, and modified segmentation
A knowledgeable zoologist should predict that the adults of this species would also feature _____. A) eight legs
B) two pairs of antennae
C) a sessile lifestyle
D) an open circulatory system
D
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Rank the following in order from most general to most specific: 1. gametic isolation 2. reproductive isolating mechanism 3. sperm-egg incompatibility in sea urchins 4. prezygotic isolating mechanism
A) 2, 3, 1, 4 B) 2, 4, 1, 3 C) 4, 1, 2, 3 D) 4, 2, 1, 3 E) 2, 1, 4, 3
The protoplanet nebula model states that the simplest and most abundant gases would have been
A. hydrogen and helium. B. oxygen and carbon dioxide. C. nitrogen and hydrogen. D. hydrogen and oxygen.
Babies in the U.S. quickly and easily develop a fear of snakes. Yet they don't easily develop a fear of guns. Why?
a) Evolution can be slow in producing populations that are adapted to their environments. b) Babies are more likely to encounter snakes than guns as they develop in the U.S. c) Fewer individuals are killed by guns than by snakes in the U.S. each year. d) Humans cannot develop fear towards inanimate objects. e) All of the above are true.
If a mutation prevents the formation of the antiterminator 2+3 loop in the trp operon, what would be the effect?
A. no effect, as 2+3 loop has no function B. transcription only when tryptophan is absent C. transcription only when tryptophan is present D. constitutive attenuation of transcription E. constitutive transcription