A painful muscle contraction that does immediately release is a(n) ____
a. cramp
b. dystrophy
c. atrophy
d. sarcoma
e. tear
ANSWER: a
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During a field trip, an instructor touched a moth resting on a tree trunk. The moth raised its forewings to reveal large eyespots on its hind wings. The instructor asked why the moth lifted its wings
One student answered that sensory receptors had fired and triggered a neuronal reflex culminating in the contraction of certain muscles. A second student responded that the behavior might frighten predators. Which statement best describes these explanations? A) The first explanation is correct, but the second is incorrect. B) The first explanation refers to proximate causation, whereas the second refers to ultimate causation. C) The first explanation is biological, whereas the second is philosophical. D) The first explanation is testable as a scientific hypothesis, whereas the second is not. E) Both explanations are reasonable and simply represent a difference of opinion.
Which of the following carbohydrates is made by plants and is not digested by humans?
A) lactose B) starch C) cellulose D) glycogen
Fermentation enables glycolysis to continue under
A.) anaerobic conditions. B.) aerobic conditions. C.) photosynthetic conditions. D.) low-light conditions.
How were researchers able to determine whether hemimethylation inhibited replication or if initiation required full methylation of the Dam target sites in E. coli?
What will be an ideal response?