Which characteristic differentiates prokaryotes from eukaryotes?
A. No membrane-bound organelles
B. No cell membrane
C. No genetic material
D. No ribosomes
Ans: A. No membrane-bound organelles
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Which statement is true?
a. An ecosystem doesn’t disappear until the last species it contained goes extinct. b. Loss of biodiversity only matters to the extent that it affects crops and livestock. c. Extinction is a natural component of the evolution of life on Earth. d. Human impact on biodiversity has been inconsequential at most.
Which of the following conditions favors sexual reproduction?
a. stable environment b. uniform environments c. sparsely settled populations d. sessile animals e. unstable environment
Movement of a molecule against a concentration
gradient is a. simple diffusion. b. facilitated diffusion. c. osmosis. d. active transport. e. bulk flow.
Lipids and carbohydrates can both be used by animals to store energy.
Answer the following statement true (T) or false (F)