A water-vascular system is characteristic of the
phylum
a. Arthropoda.
b. Annelida.
c. Chordata.
d. Mollusca.
e. Echinodermata
E
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The genome of influenzavirus is
A) multiple pieces of linear dsDNA. B) a single circular ssRNA. C) a single linear dsRNA. D) a single circular ssDNA. E) multiple pieces of linear ssRNA.
70S is the sedimentation rate of which of the following?
A) prokaryotic cells B) eukaryotic cells C) eukaryotic cells, chloroplasts and mitochondria D) chloroplasts and mitochondria E) prokaryotic cells, chloroplasts and mitochondria
The figure below shows the effect of an antagonistic pleiotropic mutation A. What would be the effect of a mutation B that delayed the onset of reproduction without changing the survival curve?
a. Genotypes carrying A and B would have a higher fitness than genotypes carrying A without B. b. Genotypes carrying A and B would have a lower fitness than genotypes carrying A without B. c. B would not have any effect on the fitness of individuals with A. d. We cannot determine the effect of B without the survival curve for individuals that are wild-type at the locus affected by A.
Which of the following defines an ecosystem?
A. all the places on Earth where living organisms can be found B. aspects of the nonliving environment interacting together C. all of the living organisms in an area interacting together D. all living organisms and the nonliving environment interacting together E. a group of organisms of the same species interacting together