________ are the main primary producers in freshwater environments
A) Phototrophic microorganisms
B) Heterotrophic microorganisms
C) Chemolithotrophic microorganisms
D) Viral microorganisms
Answer: A
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Genetic maps are constructed by estimating the distances between linked genes based on the calculation of ____________________
Fill in the blank(s) with correct word
Sucrose moves into a cell against its concentration gradient at the same time that protons move into the cell along their concentration gradient. This is an example of ____.
a. symport b. passive diffusion c. antiport d. facilitated diffusion
e. active transportWhat is the best type of model for visualizing the surface of a protein?
A.) backbone B.) wire C.) ribbon D.) space filling
The rapid expansion of angiosperms late in the Mesozoic era appears to be related to their coevolution with ____.
A. dinosaurs B. gymnosperms C. insects D. mammals E. birds