Describe some ways in which, at the molecular level, the process of evolution ‘tinkers' with existing struc-tures to produce novel functions
What will be an ideal response?
ANS:
Will vary, but should include: gene sharing and gene duplication, and could include the examples used in the text; gene sharing in lens crystallins with separate enzymatic functions and/or the ‘lock and key' pair the mineralocorticoid receptor and the steroid hormone aldosterone with an ancestral glucocorticoid receptor.
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The fossil record indicates that the first vascular plants possessed roots
A. true B. false
Mycobacterium tuberculosis has chemicals in its cell wall that inhibit the fusion of phagocytic vacuoles with lysosomes. Which statement is true?
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Who played the most influential role in discovering protists?
a. Rudolf Virchow b. Anton van Leeuwenhoek c. Theodor Schwann d. Matthias Schleiden
Which of the following is not an electron carrier that participates in the electron-transport chain?
(a) cytochrome (b) quinone (c) rhodopsin (d) copper ion