Hemoglobin gives up O2 when
a. partial pressure of oxygen is lower than in the blood.
b. body temperature is lowered.
c. pH values are high.
d. CO2 concentrations are low.
e. O2 concentrations are high.
A
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a. single-stranded; double-stranded b. double-stranded; single-stranded c. both are single-stranded d. both are double-stranded
During which period did the coal forests form?
a. Cambrian b. Carboniferous c. Quaternary d. Jurassic e. Ordovician
All arthropods _____.
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Which enzyme is made up of both RNA and protein?
A) RNA polymerase B) nucleosome C) ribosome