You have discovered a new coccoid-shaped microorganism with no nucleus, a rigid cell wall, and a diameter of 2 µm. Chemical tests reveal that its cell wall does NOT contain peptidoglycan. The new microorganism is
A) most likely a bacterium.
B) most likely a eukaryote.
C) most likely an archaeon.
D) either a bacterium or an archaeon.
Answer: C
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A group of interbreeding individuals in a specific geographical location is called a
a. gene pool. b. species. c. population. d. community. e. ecosystem.
Spindle fibers attach to the ____ of a chromosome during cell division
a. centromere b. telomere c. cell membrane d. short arms e. gametes
What generally causes stomata to open?
a. the release of abscisic acid by the roots b. a drop in CO2 concentration in leaf air spaces c. an exposure to red light d. a drop in O2 concentration in leaf air spaces
Which of the following statements about the prokaryotic flagella is CORRECT?
a. it's filament is made up of multiple types of proteins b. it is driven by the proton motive force c. it is made up of a single structure d. it moves with a whiplike motion