Which statement is true of Planaria?
a. They have a well-developed circulatory system.
b. They have a mouth located in their anterior end.
c. They expel wastes via the action of ciliated flame cells.
d. They contain a primitive, ladder-like skeletal system.
c. They expel wastes via the action of ciliated flame cells.
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The donor cell makes ___________ whose function is to bring F- cells close enough to transfer a ___________ to the recipient.
A. a sex pilus, single strand of DNA B. a sex pilus, double strand of DNA C. an F factor, fertility plasmid D. an F factor, replicated F factor E. a sex pilus, bacterial chromosome
A liquid that can dissolve other substances is
called a
a. compound. b. mixture. c. solvent. d. solute. e. solution
Which statement about the geologic time scale is false?
a. Mammals originated early in the Mesozoic era. b. Radiations of marine invertebrates took place in the Mesozoic era. c. Mass extinction of the dinosaurs occurred about 65 million years ago. d. Reptiles originated during the Paleozoic era. e. Eukaryotes originated during the Proterozoic eon.
An example of a complex carbohydrate is sucrose
____________________ Indicate whether the statement is true or false.