Which of the following statements regarding chemotaxis is incorrect?
A. In a tumble, the flagellum reverses direction, causing the cell to stop moving and change course.
B. When a cell detects a nutrient gradient, it will increase the frequency of runs to move toward the nutrient.
C. The fuel for flagellar motion is not ATP, but a proton gradient.
D. In a cell with peritrichous flagella, each flagellum moves individually but in a coordinated direction during a run.
Answer: D
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You are studying the synthesis of Molecule X in prokaryotes when you make the following observations: • When Molecule X is present in the prokaryotes’ environment, synthesis does not occur. • Molecule X synthesis increases when Molecule Z is present in the cell. • Molecule Z is never found outside of prokaryotic cells. Which statement can be supported by your observations?
a. Molecule Z is a repressor b. Molecule Z is an inducer c. Molecule Z is an activator d. Molecule Z is an operon
Nonprotein catalysts are known as ________
Fill in the blank with correct word.
A population's demographics include its
a. size. b. age. c. structure. d. density. e. all of these.
A mutation occurring in which cell type can be passed from parent to offspring?
a. gamete b. somatic cell c. diploid cell d. stem cell e. red blood cell