Vines in tropical rain forests must grow toward large trees before being able to grow toward the sun. To reach a large tree, the most useful kind of growth movement for a tropical vine presumably would be _____
A) negative thigmotropism
B) negative phototropism
C) negative gravitropism
D) the opposite of circadian rhythms
B
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Between the specialized functions of the rough and smooth endoplasmic reticulum, neither have the ability to
A. produce lipids. B. produce mRNA. C. produce proteins. D. detoxify poisons. E. form vesicles for transport to the Golgi apparatus.
The mode of natural selection in which extreme phenotypes are less fit than the optimal intermediate phenotype is
A. convergent selection. B. disruptive selection. C. artificial selection. D. directive selection. E. stabilizing selection.
How many helices are present in crambin?
a. 1 b. 2 c. 3 d. 4
Water has the ability to dissolve salts and carry dissolved carbon dioxide. How does this action help the human body maintain homeostasis?
A) production of energy for cells B) distribution of needed materials to the cells C) removal of waste from the cells and the body D) absorption of needed materials from the environment