<h3><u>Answer and Explanation</u>;</h3>
- Purines: Heterocyclic rings are synthesized one atom at a time, first atom attached to ribose phosphate (source is PRPP) and then all the other atoms are added .
- Pyrimidines: Common intermediate, orotate, synthesized first, then orotate is attached to ribose phosphate (source is PRPP or 5-Phosphoribosyl-1-pyrophosphate).
A state of biological balance, or _HOMEOSTASIS_, is important for the survival of individual cells and _the whole organism_ alike.
Because if this organism is unknown they will preform tests to see which organism it is
The O allele (i) is recessive to the B allele (B), so the mother's genotype must be Bi (since she passes on the i allele to her son). In order for that to happen, one of her parents had to have at least one B allele and one i allele.
The answer is A.) <span>One of her parents had at least one O allele.
The other answers are possible but not necessarily true.</span>