Which of the following features enable organisms like planarian to respire and exchange nutrients?
A. a trilobed gastrovascular cavity
B. coelomic fluid
C. an open circulatory system
D. closed circulatory system
Answer: A
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The observation that freshwater habitats account for only 1% of Earth's water, and they are home to 36% of the known species of fish is due to speciation.
A. parapatric B. prezygotic C. sympatric D. postzygotic E. allopatric
A ____ mutation changes the DNA sequence but has no impact on the fitness of the individual
a. beneficial b. lethal c. random d. neutral e. deleterious
The relationship between strands of RNA and DNA during transcription is
a. antagonistic. b. opposite. c. complementary. d. an exact duplicate. e. unrelated.
What structure is responsible for selecting and transporting only properly processed eukaryotic mRNAs into the cytoplasm?
A. ribosomes B. spliceosome C. snRNPs D. nuclear pore complex E. RNA polymerase