All vertebrates have a(n) __________ system of secretory glands and cells.
Fill in the blank(s) with the appropriate word(s).
endocrine
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How do spheroplasts and protosplasts differ?
A. Spheroplasts retain the peptidoglycan but protoplasts do not. B. Spheroplasts retain their outer membrane but protoplasts do not. C. Spheroplasts form from cocci and protoplasts form from bacilli. D. There is no difference; these terms are synonyms.
?-glucose is present in potatoes and ?-glucose is present in wood. Both are glucose molecules but one can be used by humans to synthesize ATP and one cannot. Based on this information, what is the best explanation on why humans can only digest one of the glucose types?
A. Only ?-glucose can form polysaccharides. B. ?-glucose is C6H12O6 and ?-glucose is C5H12O6. C. ?-glucose is a chain and ?-glucose is a ring. D. ?-glucose and ?-glucose are stereoisomers with OH groups oriented differently.
Which of the following does not contribute to the increasing levels of methane in the atmosphere?
A. Methane production at sewage treatment plants B. Methane production in termites C. Methane production in rice paddies D. Methane production beneath an aerobic water column
Amniocentesis and chorionic villi sampling are performed in order to
a. Discover the gender of the baby b. analyze the chromosomes c. check for limb abnormalities d. none of the above