Which of the following statements is TRUE?
A) both members are harmed in a symbiotic relationship
B) Members of a symbiotic relationship cannot live without each other
C) A parasite is not in symbiosis with its host
D) Symbiosis always refers to different organisms living together and benefitting from each other
E) At least one member must benefit in a symbiotic relationship
Ans: E) At least one member must benefit in a symbiotic relationship
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The evolutionary origin of mitochondria is demonstrated by which of the following key genomic characteristics?
A) variable numbers of protein-encoding genes B) large stretches of AT-rich DNA C) linear and circular genome structure in different organisms D) rRNA genes most closely related to Bacteria
A hectare of wheat fixes 32,000 kg of carbon per year through photosynthesis and uses 7,000 kg of carbon per year for cellular respiration. The net primary productivity of the wheat field is therefore ________ kg of carbon/hectare/year.
Fill in the blank(s) with the appropriate word(s).
Birds are classified as
A. reptiles. B. mammals. C. amphibians. D. fishes. E. invertebrate chordates.
What antibacterial chemical is present in tear fluid?
A) antibodies B) complement C) defensins D) lysozyme E) interferon