Which of the following is a net sugar source for a deciduous angiosperm tree?
A) new leaves in early spring
B) fruits in summer
C) roots in early spring
D) roots in early autumn
C
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The extracellular matrix (ECM) affects a cell that it surrounds in which ways? (Select all correct choices.)
A. The ECM affects the shape that the cell takes, depending on the structure and composition of the extracellular matrix. B. The ECM affects the genes that the cell expresses, depending on the types of fibrous proteins in the extracellular matrix. C. The ECM affects the size that the cell grows to, depending on the polysaccharides in the extracellular matrix. D. The ECM has no effect on the cells that it surrounds. E. All of these choices are correct.
Which of the following does not occur in the large intestine?
A. absorption of fats B. reabsorption of water C. formation of feces D. storage of feces E. production of vitamin K by bacteria
Short-day plants
a. flower in early spring. b. will not bloom until they have been exposed to a dark period longer than a critical length. c. flower in the fall. d. will not bloom if their dark period is interrupted by a short pulse of intense red light. e. do all of these
Genetic differences between populations tend to be reduced by
A) gene flow. B) mutation. C) the founder effect. D) natural selection.