It was possible to view viruses only after the invention of the electron microscope because they are too small to be seen with a light microscope.
Answer the following statement true (T) or false (F)
True
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A __________________ is a diagram that depicts the exchange of carbon between organisms, whereas a _______________ is a diagram that depicts the transfer of energy between organisms
A. trophic pyramid; food web B. food web; trophic pyramid C. food web; circuit D. trophic pyramid; circuit
The cell membrane is a rigid structure that provides bacteria with their characteristic shapes.
Answer the following statement true (T) or false (F)
The convergence in external morphology of sharks, penguins, and porpoises is attributed to
a. reduced genetic variability in these groups. b. selection pressures that are common to these groups. c. reproductive isolation of these groups. d. identical genes in all three groups. e. use and disuse of the limbs.
A human female with only one X chromosome is said to have a condition called
A. Turner syndrome. B. Klinefelter syndrome. C. Down syndrome. D. Angelman syndrome. E. X chromosome inactivation.