Taxis is
a. another term for bacterial tumbling.
b. caused by the undulating motion of a bacterium.
c. another word for stimulus.
d. movement towards or away from a stimulus.
Ans: d. movement towards or away from a stimulus.
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Around 150 living genera of animals provide direct support of the endosymbiont theory by ____
a. hosting Archaea in their cells b. having bacterial ribosomes in their cells c. using the cell membrane to protect against bacterial invaders d. ejecting cyanobacterial invaders e. hosting eukaryotic algae or cyanobacteria in their cells
Sexual reproduction has many benefits from a genetic standpoint. Can you think of any downside to sexual
reproduction? What will be an ideal response?
Age-related changes include
a. taste buds becoming less sensitive. b. people becoming farsighted. c. sensory nerve cells in the ear become "worn out." d. a reduction in male fertility. e. all of these
__________ regulates the maturation of the mammary glands, and then _____ causes contraction of milk glands.
Fill in the blank(s) with the appropriate word(s).