Which lineage of Cnidarians includes adults that are predominately medusae and the true jellyfishes?
a. Anthozoa
b. Hydrozoa
c. Scyphozoa
d. Cubozoa
Ans: c. Scyphozoa
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The action of a nerve impulse, neurotransmitter release at the neuromuscular junction, calcium release from the sarcoplasmic reticulum, and subsequent muscle contraction is known as:
A. an action potential B. threshold potential C. a motor event D. excitation-contraction coupling
One major innovation in animal body plan was the development of the coelom. Describe the role of the coelom
What will be an ideal response?
To which group do orangutans belong?
A) Anthropoid monkeys B) Nonanthropoid monkeys C) Anthropoid apes D) Nonanthropoid apes
Scientists have inserted a gene from the bacterium Bacillus thuringiensis into corn plants in order to:
A) directly increase the growth rate of the corn. B) increase the corn's resistance to insects. C) decrease the plant's toxicity. D) increase the plant's tolerance to solar radiation. E) decrease the toxicity of Bacillus thuringiensis.