Which of the following is not a category of symbiosis?
A. Parasitism
B. Commensalism
C. Communalism
D. Mutualism
Answer: C
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Fossils of plants found in deeper geologic layers do not show vascular tissues, while fossils in shallower geologic layers include some specimens with and some without vascular tissues. Thus, vascular tissue in plants is considered a ____ character.
a. ancestral b. homoplasious c. primitive d. derived e. physiologically essential
When a reaction reaches equilibrium,
a. there is no longer entropy in the system. b. the chemical reactions cease. c. the rate of the forward and reverse reactions are equal. d. the concentration of reactants equals the concentration of products. e. ATP is no longer required to drive the reaction.
Sickle-cell anemia has been traced to what type of mutation?
a. frameshift b. transposable element c. mutagenic d. base-pair substitution e. viral
In birds, after fertilization but prior to the emergence of the chicks, the development of the fertilized egg is:
a. dimorphic. b. internal. c. ignored by both parents. d. external. e. variable.