Periodically shedding their outer covering is a feature unique to the
A. bryozoans.
B. lophotrochozoans.
C. mollusca.
D. ecdysozoans.
E. echinodermata.
Answer: D
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A new hormone is discovered. Tests reveal that it is small, hydrophilic, and degraded by a protease. What type of hormone is it?
A. peptide B. amino acid derivative C. steroid D. glucocorticoid E. prostaglandin
The body region where a ciliary escalator helps to sweep microbes trapped in mucus away from that body site is the ________.
A. respiratory tract B. urinary tract C. skin D. digestive tract E. eyes
Carbohydrates are broken down into simple sugars called _____ to be absorbed.
A) glycogen B) nucleic acids C) glucose D) monosaccharides
Which of the following structures is NOT found in some prokaryotic cells?
A) flagellum B) axial filament C) cilium D) pilus E) peritrichous flagella