Which animal has the least advanced nerve cord?
a. chordate
b. arthropod
c. flatworm
d. human
e. octopus
ANSWER: c
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What happens to CDK in the absence of cyclin?
A. It is inactive. B. It is degraded. C. It becomes phosphorylated. D. Answers a and c are both correct.
After you have found a new species of ape, you spend 10 years in the field seeking a fossil of its ancestor. You fail. This lack of fossil data:
A. is expected, because the fossil record is incomplete. B. is expected because the species is too young to have fossilized ancestors. C. is unexpected, because the fossil record shows a complete record of all vertebrates. D. completely negates the anatomical and genetic data you have collected that indicate your new species is a type of gorilla.
Which is not a hypothesis that attempts to explain the latitudinal diversity gradient?
A. Species in tropical habitats have had longer to evolve and diversify. B. Temperate communities have fewer species due to the need to adapt to a wider range of weather conditions. C. Tropical areas have larger population sizes for a given species. D. A given species in tropical habitats may be more spread out, leaving room in between for others. E. Tropical areas generally have more parasites that may attack particular types of trees, thereby affecting their distribution.
What is the correct order that a motor nerve impulse travels when triggering a muscle contraction?
A. motor nerve-sarcolemma-synaptic cleft-sarcoplasmic reticulum-troponin B. motor nerve-sarcolemma-sarcoplasmic reticulum-synaptic cleft-troponin C. motor nerve-synaptic cleft-sarcolemma-troponin-sarcoplasmic reticulum D. motor nerve-synaptic cleft-sarcolemma-sarcoplasmic reticulum-troponin E. motor nerve-sarcoplasmic reticulum-synaptic cleft-sarcolemma-troponin