A strain that can grow in minimal medium containing ornithine, citrulline, or arginine, but not in minimal medium alone 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 found in the following metabolic pathway for arginine synthesis. See the figure below for an overview of the arginine biosynthetic pathway.



A. enzyme 1.

B. enzymes 1, 2, and 3.

C. enzyme 2.

D. The strain would be the wild type with no genetic mutations.

E. enzyme 3.

F. enzymes 1, 2, and 3.

G. The strain would be the wild type with no genetic mutations.






A. enzyme 1.

Biology & Microbiology

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Tropical forests are known for

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Actinomyces spp., Bifidobacterium spp., and Clostridium spp. can be described as:

a. aerotolerant organisms that can grow in the presence of either reduced or atmos-pheric oxygen but grow best under mi-croaerobic conditions. b. strictly anaerobic organisms that cannot grow in the presence of either reduced or atmospheric oxygen but grow only under anaerobic conditions. c. aerotolerant organisms that can grow in the presence of either reduced or atmos-pheric oxygen but grow best under anae-robic conditions. d. facultatively anaerobic organisms that grow in the presence or absence of at-mospheric oxygen.

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Clements proposed the climax-pattern model of succession. Governing factors for this model include

A. soil conditions. B. climate. C. each successive community preparing the way for the next. D. All of the choices are correct.

Biology & Microbiology

In women, the combined effects of estrogen and progesterone cause a decrease in GnRH levels

Indicate whether the statement is true or false

Biology & Microbiology