Unlike passive transport, active transport requires
A.) concentration gradients.
B.) diffusion.
C.) energy from the cell.
D.) vesicles.
Ans: C.) energy from the cell.
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If you (incorrectly) proposed that tundra, the world's largest land biome, contains high species richness, your proposal would be consistent with the
A. area hypothesis. B. time hypothesis. C. productivity hypothesis. D. MTE. E. MDE.
Experiments on selective adhesion demonstrated
a. ectoderm cells have positive affinity for mesoderm cells but negative affinity for endoderm cells d. ectoderm cells have positive affinity for both endoderm and mesoderm cells b. ectoderm cells have negative affinity for mesoderm cells but positive affinity for endoderm cells e. endoderm cells have positive affinity for both ectoderm and mesoderm cells c. endoderm cells have positive affinity for mesoderm cells but negative affinity for ectoderm cells
What does a counter current blood flow supply for cetaceans? a. It transfers oxygen
b. It conserves body heat. c. It increases circulation. d. It improves mobility.
Some evidence that algae are the closest relatives to plants is that they both
A. have chloroplasts. B. contain chlorophyll a. C. have cellulose-rich cell walls. D. use starch as a nutrient reserve. E. All of the answer choices are correct.