An inducible operon is usually controlled by:

a. an inducer molecule that keeps it in the "off" state.
b. an active repressor that keeps it in the "off" state.
c. being active at all times.
d. allolactose.
e. being turned "off," usually by the end product of the pathway


B

Biology & Microbiology

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Which of the following organisms produce organic matter from inorganic molecules?

A. photosynthetic bacteria B. plants C. algae D. autotrophs E. All of the choices are correct.

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Answer the following statements true (T) or false (F)

1. The animal kingdom is a monophyletic grouping. 2. The terms "dorsal" and "oral" are synonyms. 3. A pseudocoelom is a cavity that develops into the coelom during embryonic development. 4. A hydrostatic skeleton has no bones or cartilage.

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One effect of auxin, which triggers the elongation of cells, is to affect cell walls by increasing their  

A.  permeability. B.  plasticity. C.  stiffness. D.  thickness. E.  water solubility.

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Substitution of one base pair for another in a coding region of a gene can result in a ____ mutation

where the changed codon codes for a different amino acid than was previously coded for.

a. missense b. chromosomal c. frameshift d. silent e. nonsense

Biology & Microbiology