How long did it take in the history of life on Earth to go from the first prokaryotic cells to the first eukaryotic cells?

A. 1,000 years
B. 1 million years
C. 100,000 years
D. Over a billion years


Answer: D

Biology & Microbiology

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How many different chromosomal combinations can occur as a result of meiosis?

a. 8,388,608 b. 3,450,000 c. 5,450,750 d. 2,000,000 e. 6,600,980

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Would you expect motor units to vary in size? If so, which of these structures would probably have the largest ones?

A) No; all motor units are the same size. B) Yes; a motor unit in the thigh to control leg movements would be the largest one. C) Yes; a motor unit that controls eye movements would be the largest one. D) Yes; a motor unit that controls hand movements would be the largest one.

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Which of the following statements regarding dynamic instability is false?

(a) Each microtubule filament grows and shrinks independently of its neighbors. (b) The GTP cap helps protect a growing microtubule from depolymerization. (c) GTP hydrolysis by the tubulin dimer promotes microtubule shrinking. (d) The newly freed tubulin dimers from a shrinking microtubule can be immediately captured by growing microtubules and added to their plus end.

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What number is the Flagellum?

What will be an ideal response?

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