Answer:
I guess it is a Secondary Succession.
Explanation:
Secondary succession is the series of community changes which take place on a previously colonized, but disturbed or damaged habitat. Examples include areas which have been cleared of existing vegetation.
Structure A is used for (4) cell communication. The cell membrance has receptros for cell communcation.
Structure B is used to (1) extract energy from nutrients. The mitochondria is the power house of the cell.
Structure C is used for (1) protein synthesis. The golgi apparatus is where protein is created.
Answer:
1) c
2) b
Explanation:
1) In the vast majority of the cells in the human body, the DNA sequence is the same. How the cells use the information in the DNA is how cells have their own identity. For example, a bone cell will use the DNA very differently from a nerve cell. The answer cannot be a, b or d, because this would involve changes in the DNA sequence.
Instead the answer is c, because the cells express different genes that lead to the production of different sets of proteins. This then further impacts the regulation of the genes specifying each cell type
2) Post-transcriptional gene regulation refers to processes that modify the expression of a gene after transcription. This is distinct from post-translational modification, which is modifications to a protein after it has been translated (e.g. phosphorylation).
DNA methylation (d) represents a potential mechanism of gene regulation prior to transcription. As does (c), as modifications to histone proteins can affect transcription. The binding of a repressor protein (a) also represents changes to gene transcription.
In contrast, alternative splicing of exons in an RNA transcript is a method of post-transcriptional gene regulation. Alternative splicing is a part of RNA processing, and occurs as part of the processing of a primary RNA transcript into a mature RNA. Alternative splicing can produce markedly different proteins.
1. Krebs cycle
2. B) Electrons have stopped moving through the electron transport chain.
3. Carbohydrates molecules
