Fibroblast cells are a good model system for studying muscle differentiation because
A. they are totipotent
B. they never differentiate into muscle cells in a normally developing animal
C. they can differentiate into muscle cells in a normally developing animal
D. they express a limited number of genes
E. they have a small genome
B. they never differentiate into muscle cells in a normally developing animal
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What kind of trees dominate in ecosystems characterized by warm, wet climates with no distinct seasonality?
A) broadleaf evergreen B) drought-deciduous C) winter-deciduous D) needle-leaf evergreen
Which of the following highlight the benefits of soil to plants?
A. soil supplies materials B. soil harbors nitrogen fixing bacteria C. soil has water holding capacity D. soil allows for air to be supplies to roots E. all are plant responses during heat and water stress
Most of the aquatic macroinvertebrates in a stream are
a. clams. b. insect larvae. c. worms. d. arthropods such as crayfish.
The scorpion sting is described as one of the most painful stings. The pain is associated with the neurotoxins from the sting that cause the sodium channels to
A. remain open. B. remain closed. C. open and close repeatedly. D. misfire. E. None of the answer choices is correct.