The cones of gymnosperms play the same role as ____ in angiosperms.
A. flowers
B. seeds
C. leaves
D. fruit
E. roots
Answer: A. flowers
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When a ___ hormone carrier protein complex contacts the surface of a cell, the hormone is released
and penetrates directly through the plasma membrane.
a. peptide b. steroid c. protein d. peptide and protein e. peptide, steroid, and protein
The main nutrient storage molecule in fungi is
A. cellulose, a carbohydrate. B. glycogen, a carbohydrate. C. chitin, a carbohydrate. D. starch, a polysaccharide. E. glucose, a monosaccharide.
Enzymes ____
a. control the speed of a reaction b. change shapes to facilitate certain reactions. c. may place physical stress on the bonds of the substrate. d. always work on their own. e. lower activation energy.
The first organisms on Earth were very small, but now when you look around you see many large organisms. Which is the best explanation for this observation?
A) Evolution tends toward larger and larger organisms. B) There were many steps necessary to go from small cells to large organisms. C) Organisms got larger because they needed to use resources more efficiently. D) The goal of evolution is to produce the largest organisms possible.