Cephalization refers to
a. a type of symmetry.
b. a type of segmentation characteristic of lower
forms of life.
c. a group of protective cells found in the tentacles
of a polyp.
d. a transitional state in the life cycle of a jellyfish.
e. none of these.
Answer: e
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Gene flow can speed up AND slow down adaptation
a. true b. false
The presently accepted model of enzyme action was proposed by Daniel Koshland in the 1960s and suggested that the enzyme was a flexible structure with an active site roughly complementary to the substrate that binds it. After its initial interaction with the substrate, the enzyme alters its shape and thus improves the fit of the substrate in the active site. What is the name of this model?
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The vascular bundle in the shape of a single central cylinder in a root is called the _____
A) cortex B) stele C) periderm D) pith
A flower's parts are modified ____ that develop from a receptacle.
A. epidermal cells B. asexual organs C. regions of a stem D. leaves E. ovaries