The main byproduct of photosynthesis that is essential to most life forms is
A. glucose.
B. carbon dioxide.
C. chlorophyll.
D. oxygen.
E. sunlight.
D. oxygen.
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In the classic fable of "the boy who cried wolf," the villagers who stopped listening to the shepherd boy who kept lying and telling them that a wolf was attacking the sheep were exhibiting the form of learning called ____
Fill in the blank with the appropriate word.
The researchers who first discovered the mechanism of control of a bacterial gene were:a
Hershey and Chase. b. Griffith and Avery. c. Watson and Crick. d. Jacob and Monod. e. McClintock and Morgan
Which of the following is one of the main locations for the type of tissue in Figure 39-1?
a. lining of the digestive tract b. within blood vessels c. dermis of the skin d. respiratory passages e. air sacs of the lungs
Which of the following is NOT usually considered a mutation?
a) DNA methylation taking place on a CpG site that formerly was un-methylated b) Translocation whereby a region of chromosome 8 is swapped with chromosome 14 c) Shortening of a micro satellite repeat in the exon of a gene during mitosis d) A change in the base sequences of DNA