The organelle that contains chlorophyll a and carries out photosynthesis in plants is the
A. central vacuole.
B. cell membrane.
C. Golgi body.
D. mitochondrium.
E. chloroplast.
E. chloroplast.
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You are at the aquarium looking at a freshwater mammal tank and a manatee swims close to the glass. On his front flippers you see fingernails. You think, what possible use could fingernails be to a manatee, then you realize they are of no use at all. Which of the following best explains the presence of fingernails on a manatee?
A. they are remnants of the bones used by fish for their fins. B. they are homologous structures. C. the bones are protruding from the fins and only look like fingernails, even though every manatee in the tank looks like it has fingernails. D. convergent evolution has occurred. E. they are vestigial structures.
High stomach acidity
a. creates ideal conditions for carbohydrate digestion. b. promotes emulsification of fats. c. favors protein digestion. d. blocks the release of histamine, thereby favoring production of peptic ulcers. e. converts lipases into their active forms
The logical scientific method for studying nature
includes all of the following EXCEPT:a. observing nature b. developing explanations c. testing the explanations d. genetically engineering test subjects
Using organic matter such as manure or compost for fertilizer
A. improves fertility. B. aerates the soil. C. increases the water holding capacity of the soil. D. provides food for beneficial soil microorganisms. E. All answers are correct.