Name the two groups of organisms that are classified as nonvertebrate chordates and indicate their unique features.
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The cephalochordates (lancelets) and urochordates (sea squirts) are nonvertebrate chordates. The cephalochordates are small marine chordates that filter feed on the microscopic plankton found in water. They will filter it through their gills with a chamber known as the atrium before the water exists via the atriopore. The notochord will extend from the head to the tail, segmentation is also present.
The urochordates appear to be a thick-walled sac that lives on the ocean floor. They have an incurrent and excurrent siphon through which water passes. They will also filter feed on microscopic plankton. They are bilaterally symmetrical and will be sessile as adults.
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Which of the following occurs in feedback inhibition?
a. Coenzymes block enzyme activity. b. Products of metabolic reactions block enzyme activity. c. NADH is altered in electron transport chains. d. ADP is phosphorylated. e. Low reactant concentrations decrease enzyme activity.
During the Pleistocene epoch, plant communities changed dynamically in response to which mechanism?
a. a meteor impact b. iridium in the soil c. fluctuating climates d. intense grazing pressure e. competition with gymnosperms
Why do eukaryotic cells have to undergo the individual steps of mitosis while prokaryotic cells can merely pull in half by binary fission?
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Which is the most muscular and powerful chamber of the heart?
A. right atrium B. left atrium C. right ventricle D. left ventricle