You isolate a cellular structure and determine that it is composed of ?-tubulin and ?-tubulin. Based on
this evidence, you correctly identify this structure as:
a. a structural MAP.
b. a microfilament.
c. a microtubule.
d. an actin filament.
e. a myosin filament.
C
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As rainfall in an African savanna decreases, it would most likely change into
A. tiaga. B. desert. C. tropical rainforest. D. temperate forest. E. tundra.
In what molecular form does the human body store excess carbohydrates in muscles and the liver?
What will be an ideal response?
Which of the following best describes a plasmid
A. a small piece of DNA outside the chromosome B. Segments of chromosome that code for a functional product C. A segment of chromosome which is used in conjugation D. Small piece of DNA found in mitochondria E. DNA found only in eukaryotic cells
In a PET scan a patient is injected with radioactively labeled glucose. Why would cancer cells take up more of the radioactive glucose than surrounding noncancerous tissues?
A. Because they require more oxygen to metabolize glucose. B. Because they are more sensitive to radiation. C. Because they rely more on oxidative phosphorylation than glycolysis to produce ATP. D. Because they are less sensitive to radiation. E. Because they produce more enzymes found in glycolysis.