Adenine, thymine, guanine, and cytosine
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<span>They are not visible because the chromatin coils up,shortens,and thickens.</span>
Answer:
Ribosomal RNA (rRNA) associates with a set of proteins to form ribosomes. These complex structures, which physically move along an mRNA molecule, catalyze the assembly of amino acids into protein chains. They also bind tRNAs and various accessory molecules necessary for protein synthesis.
Explanation:
<span>Glycogen is to animal cells as STARCH is to plant cells.</span>
