Deduce why viruses are excluded from the ribosomal RNA-based tree of life
A) Some viruses contain multiple strands of RNA.
B) Their genetic elements cannot be sequenced.
C) They can infect other organisms, which complicates the genetic comparisons.
D) They lack ribosomal RNA.
Answer: D
Biology & Microbiology
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What will be an ideal response?
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The ___ Echinoderm lineage is made up of sea cucumbers, which are elongated along their oral-aboral axis and have a
well-developed circulatory system.
a. Echinoidea b. Ophiuroidea c. Crinoidea d. Holothuroidea e. Asteroidea
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The fundamental unit of taxonomic classification is the ________.
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology
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Biology & Microbiology