An enzyme binds its substrate at the active site
__________________ Indicate whether the statement is true or false.
T
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________ are glycoprotein spikes protruding from the outer surface of the viral envelope.
Fill in the blank(s) with the appropriate word(s).
Why is nitrogen fixation by prokaryotes essential to life on Earth?
a. It removes nitrogen from the soil. b. It converts atmospheric nitrogen to a non-toxic form. c. It provides nitrogen sources for plants and animals. d. It provides an energy source for photosynthesis. e. It allows for the breakdown of complex macromolecules.
The difference in the concentration of dissolved particles from one location to another is called a
A.) concentration gradient. B.) concentrated solution. C.) saline solution. D.) dynamic gradient.
What kind of oocyte is released from the ovary at ovulation?
A. primary B. ovum C. secondary D. germinal