The letter “B” from above represents which of the
following?
a. nucleus of the flame cell
b. small capillaries which allow water to freely
diffuse into the planarian
c. sexual reproductive organ of the planarian
d. cilia which flick to draw fluid into the planarian
e. none of these
Answer: d
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Are all species introductions the fault of humans? What will be an ideal response?
Some members of an animal society may have greater success at reproduction as a result of:
a. dominance hierarchy. b. sexual selection. c. reproductive isolating mechanisms. d. dominance hierarchy along with sexual selection. e. dominance hierarchy along with sexual selection and reproductive isolating mechanisms.
Where is DNA found in prokaryotes?
a. only in the nucleolus b. only in plasmids c. in the nucleolus and plasmids d. in the nucleoid and plasmids
Your friend examines an ivy vine growing on the side of a campus building and says, "Look - some of the branches on this plant have a different morphology. The leaf shapes and patterning are different, and there are flowers on some branches but not others. There must have been a mutation!" You respond,
A. "No, those branches have just undergone phase change. Now they're in the adult form, and have become competent to respond to flowering signals." B. "No, those morphological changes are just evidence that this plant's environment has changed during its lifetime." C. "I think you're right. Maybe there was a mutation in the LEAFY (LFY) gene, and the loss of LFY has promoted flowering and had pleiotropic effects on leaf morphology." D. "I think you're right. Maybe the embryonic flower (emf) gene is being overexpressed, and that's causing flowers to form."