What is the defining feature of a eukaryotic cell?
a. cell wall surrounding the cell
b. plasma membrane external to the cell wall
c. internal membranes surrounding organelles
d. ribosomes in the cytoplasm
e. large vacuole for storage
ANSWER: c
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Ligers, the offspring from the mating of a lion and a tiger, are sterile. This is an example of
(A) geographic isolation. (B) hybrid infertility. (C) gametic incompatibility. (D) mechanical incompatibility. (E) behavioral isolation
Darwin's assumption that living forms must be descended from extinct forms was based on ________ evidence.
A. anatomical B. biogeographical C. fossil D. biochemical
Which of the following is not a mechanism used to move materials in and out of the cell?
a. osmosis b. feedback inhibition c. facilitated diffusion d. active transport
The accumulation of free oxygen in Earth's atmosphere began with the origin of _____
A) life and respiratory metabolism B) cyanobacteria using photosystem II C) chloroplasts in photosynthetic eukaryotic algae D) land plants