Which of the following is not true of viroids?
A. Viroid RNA does not serve as mRNA nor does it direct the synthesis of mRNA.
B. Viroids are small circular ssRNA molecules.
C. Viroids have no protein capsids.
D. Extracellular viroids have a lipid bilayer envelope.
Answer: D
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In animals, which of the following structures is largely composed of extracellular matrix?
A. kidney B. intestine C. eye D. cartilage E. muscle
Which of the following does NOT contribute to the rapid movement of gases into and out of the blood within the lungs?
A) thin membrane B) rapid blood flow C) permeability of the membrane D) large surface area E) concentration gradient
When a DNA molecule is replicated, the daughter molecules contain one strand of parental DNA and one strand of newly synthesized DNA; this is called ________ replication.
A. conservative B. semiconservative C. hemiconservative D. dispersive
How do protists provide evidence for the step-wise evolution of mitosis?
A. Mitosis has not been observed in any protist species. B. Only meiosis occurs in protists. C. Protists use conjugation instead of mitosis. D. In some protists the nuclear membrane fails to breakdown during mitosis.