What is a homeobox?
A. An enhancer region needed for expression of a homeotic gene
B. The portion of the promoter to which a homeoprotein binds to activate transcription of genes important for development
C. A sequence within a homeotic gene that encodes the DNA-binding portion of a transcription factor
D. A cluster of homeotic genes
E. None of the answers are correct.
Answer: C
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A gaseous hormone produced by plants that helps control fruit ripening is
A. carbon dioxide. B. auxin. C. ethylene. D. chlorophyll. E. carotene.
What is the land mass labeled as 1 in the accompanying figure?
a. Pangea b. Eurasia c. Laurasia d. Gondwana e. Antarctica
Most of the photosynthetic activity in plants takes place in the
a) mesophyll. b) guard cells. c) stomata. d) xylem.
Oxygen has six electrons in its second outer shell, and hydrogen has one. With how many hydrogen atoms will oxygen form covalent bonds?
A) three B) eight C) six D) two E) one