Viruses are not included in the taxonomic scheme proposed by Carl Woese because they lack
A. genetic material.
B. ribosomal RNA.
C. proteins.
D. lipid membranes.
E. cytoplasm.
Answer: B
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Sea stars are classified in which of the following Echinoderm classes?
a. Asteroidea b. Ophiuroidea c. Echinoidea d. Crinoidea
The Protenor mode of sex determination is the ________
A) XO/YY scheme B) XX/XO scheme C) hermaphroditic scheme D) scheme based on F plasmids inserted into the FMR-1 gene E) scheme based on single translocations in the X chromosome
Biologists consider the green algae to be the ancestors of plants because
What will be an ideal response?A. green algae have the same kind of chlorophyll as plants. B. many green algae form colonies with specialized cells. C. green algae and plants both have cellulose cell walls. D. All of the above are true.
Smoking may increase your risk of lung cancer, but it does not affect the risk of bladder cancer.
a. true b. false