A hydrogen ion reacts with a water molecule to form a ____ ion.
Fill in the blank(s) with the appropriate word(s).
Ans: hydronium
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In eukaryotic organisms, the processing of the 45S rRNA into 5.8S, 18S, and 28S rRNA occurs where?
A. In the cytoplasm B. In the nucleolus C. In the endoplasmic reticulum D. In the Golgi body E. Throughout the cell
The most common eukaryotic ribosome carries out its function in the
A. Golgi apparatus. B. nucleus. C. cytosol. D. mitochondria. E. chloroplast.
Factors that can alter the level of expression of a gene include
_____ an increase in environmental temperature. _____ an increase in salinity. _____ exposure to UV radiation. _____ presence of a particular energy substrate.
In terms of surface area for exchanges, gill filaments are analogous to the __________ in the
digestive system.
a. small intestine b. villi c. stomach d. pancreas