Cells use active transport proteins to
A.) obtain molecules they need.
B.) break down molecules.
C.) engulf large particles.
D.) detect the charge of molecules.
Ans: A.) obtain molecules they need.
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When one plant is shaded by another, why is the ratio of far-red to red light increased compared to an unshaded plant?
A. Phytochrome in the taller plant absorbs most of the red light. B. Auxin absorbs mostly far-red light. C. As light passes through the leaves of the taller plant, most of the red light is absorbed by chlorophyll. D. Far-red light mostly reflects off the surface of the soil while red light is mostly absorbed. E. Shade is enriched in far-red wavelengths of light.
Near the poles, what is generally the overriding climate factor?
a. temperature b. precipitation c. latitude d. altitude e. pH
Which of the following is NOT a lipid?
A. olive oil B. fat C. amino acid D. steroid
Which of the following species is both a keystone species and a flagship species?
A. grizzly bear B. alligator C. dolphin D. beaver E. panda