The optimal pH range for most freshwater fishes and invertebrates is
A. 2 - 6.
B. 2 - 4.
C. 4 - 6.
D. 6 - 9.
E. 8 - 11.
D. 6 - 9.
Biology & Microbiology
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Stop codons are also called ________ codons
A) nonsense B) release factor C) degeneracy D) conversion
Biology & Microbiology
Some regions of chromosomes remain highly condensed, tightly coiled, and untranscribed throughout the cell cycle. These regions are referred to as
A. transposable elements. B. single sequence repeats. C. non-coding DNA. D. short interspersed elements. E. constitutive heterchromatin.
Biology & Microbiology
In human lungs, where does gas exchange
occur?
a. the pharynx b. the alveoli c. the trachea d. the bronchioles e. more than one of these
Biology & Microbiology
In paralytic polio, which structures are damaged?
A. Brain stem B. Anterior horn cells C. Peripheral nerves D. Diaphragm E. Sensory nerves
Biology & Microbiology