Photosynthetic autotrophs use ________ from the air as a carbon source and ________ as their energy source
Fill in the blank(s) with correct word
carbon dioxide; sunlight
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The presence of hydrochloric acid in the stomach serves to ____
a. inactivate pepsinogen
b. digest fats c. activate amylase d. kill bacteria e. emulsify proteins
The development of penicillin-resistant bacteria in the 20th Century represents an example of
a. punctuated equilibrium b. speciation c. genetic drift d. microevolution e. mutation
The giant squids of the deep sea remain a mystery because we lack knowledge of:
a. what they feed on. b. their exact size. c. their distribution. d. their anatomy. e. the identity of their predators.
If only about 1% of the human genome is devoted to protein-encoded genes, what is the majority of the rest?
A. structural DNA B. repeated sequences C. duplicated sequences D. transposable elements E. introns