Which of the following observation is consistent with the hypothesis that all life on earth has a common ancestor?
Answer: different organisms use the same set of amino acids
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Why does vascular cambium produce annual rings in xylem but not in phloem? What will be an ideal response?
All EXCEPT which of the following is true of the
spinal cord? a. houses connections between sensory and motor neurons b. serves as a reflex center c. its gray matter serves as passageway for nerve tracts to brain d. is covered with meninges e. is enclosed by vertebrae
Hox genes have been identified in:
a. bilaterally symmetric animals only. b. radially symmetric animals only. c. asymmetric animals only. d. both asymmetic and radially symmetric animals only. e. both bilaterally symmetric and radially symmetric animals only.
The energy used by the cell to generate specific biological molecules and highly ordered structures is stored in the form of _____________
(a) Brownian motion. (b) heat. (c) light waves. (d) chemical bonds.