A _____ is a chemical that conveys information between individuals of the same species
a. pheromone
b. neurotransmitter
c. hormone
d. all of these
A
Biology & Microbiology
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Operons that code for catabolic enzyme systems are typically regulated by repressors
Indicate whether the statement is true or false
Biology & Microbiology
The first, inner-most energy shell of an atom
A. can have a maximum of 8 electrons. B. can have a maximum of 2 electrons. C. is called the 2p orbital. D. is called the 1s orbital and can have a maximum of 8 electrons. E. is called the 2p orbital and can have a maximum of 2 electrons.
Biology & Microbiology
Plant cells have a ridged cell wall. How do plant cells expand, and how important is cell expansion to
plant growth?
What will be an ideal response?
Biology & Microbiology
what is the etiology of each of the following: typhoid fever? cholera? dysentery?
What will be an ideal response?
Biology & Microbiology