D. an RNA molecule since the RNA molecule contains information for making proteins
Tryptophan self-controls its synthesis. If we have a large amount of tryptophan in the sense that it exceeds, tryptophan would act as a co-repressor which prevents synthesis of more enzymes for its production. Hope this answers the question.
Answer:
B
the tendency of the body to maintain inner balance despite changes in external conditions
Answer:
Elements that are metals tend to lose electrons and become positively charged ions called cations. Elements that are nonmetals tend to gain electrons and become negatively charged ions called anions
Explanation:
The movement of matter across a cell membrane against a concentration difference is called an Active Transport.
