B. mass extinctions happen when populations crash due to overpopulation while background extinctions are more likely to result from disease.
Answer: The Animalia, Plantae, and Protista are kingdoms. Kingdoms are a category for Plants, Animals, Protists, Fungi, Archaebacteria, Eubacteria. The members of this kingdom, contains all the plants which includes flowering plants, mosses, and ferns. These are broad classification categories which are used in biology.
Explanation:
Answer:
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Answer:
a) the pyrimidine ring is assembled before being bonded to the ribose phosphate, whereas the purine ring is bonded to the ribose phosphate as it is formed
Explanation:
There are two ways for the synthesis of purines and pyrimidines:
- de novo synthesis-from basic simple units
- "recycling" synthesis-reuse of metabolites
Purines are synthesized directly on ribose sugar, in segments.
Pyrimidines are attached to the ribose after the synthesis of the base.
Answer:
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Explanation:
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