A strain that can grow in a minimal medium containing arginine, but NOT in minimal media containing citrulline nor in minimal media containing ornithine would have a mutation in the gene that encodes for _____.

Wild type bread mold can grow in a minimal medium without supplements, while certain mutated strains can only grow in a minimal medium that is supplemented with specific intermediates. See the figure below for an overview of the arginine biosynthetic pathway.







A. enzyme 1.

B. enzyme 2.

C. enzyme 3.

D. both enzymes 1 and 3.

E. both enzymes 2 and 3.


C. enzyme 3.

Biology & Microbiology

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The most common type of neuron in vertebrates is the _________ neuron.

A) unipolar B) multipolar C) bipolar D) semipolar

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Determine whether the following statement is true or false: Adenosine triphosphate (ATP) is a crucially important energy carrier in cells.

a. true b. false

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Using fetal DNA from the mother’s blood for prenatal testing is a noninvasive procedure

a. True b. False

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