Each skeletal muscle cell constitutes a single
A. sarcolemma.
B. muscle fiber.
C. sarcomere.
D. myofibril.
E. motor unit.
Answer: B
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Suppose a researcher for a pest-control company developed a chemical that inhibited the development of an embryonic mosquito's endodermal cells. Which of the following would be a likely mechanism by which this pesticide works?
A) The mosquito would develop a weakened exoskeleton that would make it vulnerable to trauma. B) The mosquito would have trouble digesting food, due to impaired gut function. C) The mosquito would have trouble with respiration and circulation, due to impaired muscle function. D) The mosquito wouldn't be affected at all.
After initial processing in the cytoplasm, miRNAs are imported into the nucleus where they bind to pre-mRNAs
A. True B. False
Which adaptation is a key characteristic of annelids that greatly increases their flexibility and mobility?
A) complete digestive tract B) exoskeleton C) segmentation D) three true tissue layers
Which has the greatest albedo? Grassland, forest, asphalt, or sea ice?
What will be an ideal response?