Four of these statements about master genes are true. Which statement is not true?
a. They orchestrate layers of development.
b. They are highly conserved over evolutionary time.
c. Mutations within these are frequently devastating.
d. They are highly variable in their sequences between species.
e. Mutations usually result in changes in body plan.
ANSWER: d
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Archaea and Bacteria dominate the upper 100 m of the open ocean while viruses dominate depths greater than 100 m
Indicate whether the statement is true or false.
Amniotes differ from amphibians by
a. their size. b. possession of lungs. c. internal fertilization. d. laying of eggs. e. being tetrapods
Interleukins and erythropoietin are
a. growth factors. b. Cdk's. c. cyclins. d. antitumor agents. e. intracellular signaling molecules.
How does the respiratory center control the diaphragm?
A. via the intercostal nerves B. via the phrenic nerve C. via the blood carbon dioxide level D. via the blood pH E. via the vagus nerve