A student sitting in the back row opened a bottle of foul-smelling perfume and dabbed it on her wrists. One by one (beginning from the back of the room) the students began to cough due to the foul smell. This phenomena was due to
A. an allergic reaction.
B. osmosis.
C. molecules moving from an area of low concentration to high concentration.
D. diffusion.
E. active transport.
Answer: D
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Perhaps a plant’s greatest liability is its inability to
a. produce growth hormones. b. use aerobic respiration. c. move when conditions around it deteriorate. d. produce its own lipids and proteins. e. respond to dwindling supplies of nutrients and water.
Two-component complex
What will be an ideal response?
Which of the following is an example of an allogenic change that drives succession?
A) seasonal changes in temperature, photoperiod, and light intensity B) increased shading of seedlings by adult trees in a forest C) increased nitrogen availability in soil due to the presence of leguminous plants D) reduced salinity due to surface shading by grasses in a salt marsh
Proteins are essential parts of all structures and biological processes in cells
a. True b. False