Biology Exam Questions.pdf

Here is a detailed but concise summary of the content:

Exercise 1 (8 points)

1. The two stages (a) and (b) are:
Stage (a): Transcription phenomenon
Stage (b): Translation phenomenon
2. The relationship between elements 1 (ADN) and 4 (ARNm) is that ARNm is a copy of the genetic information present in the nucleus and carried by ADN.
3. The relationship between elements 4 (ARNm) and 7 (ARNt) is that ARNt carries the amino acid and has two sites: one for the amino acid and another for the anticodon that complements the codons of ARNm.
4. The proposed experiment to prove that ARNm ensures the transfer of genetic information to the cytoplasm involves:
Incubating an animal cell in a medium containing radioactive uracil (a base that can be incorporated into ARN)
Then transferring the cell to a medium with non-radioactive uracil
Observing the appearance of radioactivity in the nucleus and then in the cytoplasm, indicating that ARNm was synthesized in the nucleus and then transferred to the cytoplasm for translation into protein.

Exercise 2 (12 points)

1. The relationship between structure (a) and its function is that the structure allows for the formation of a covalent bond (peptide bond) between amino acids.
2. The functional integration between structures (a), (b), and (c) in gene expression involves:
Transcription of genetic information from ADN to ARNm
Translation of ARNm into protein
Folding of the protein into its native conformation
3. The proposed study involves:
Analyzing the primary structure of a protein using the genetic code
Determining the tertiary structure of the protein using techniques such as X-ray crystallography or NMR spectroscopy
4. The table shows the genetic code, with codons and corresponding amino acids.
5. The proposed experiment involves:
Separating a mixture of protein subunits using electrophoresis
Identifying the subunits and their corresponding amino acid sequences
* Determining the tertiary structure of the protein using techniques such as X-ray crystallography or NMR spectroscopy

Conclusion

The exercises demonstrate the importance of understanding the structure and function of biomolecules, particularly proteins, and how they are synthesized and folded into their native conformations. The genetic code and the processes of transcription and translation are crucial for the synthesis of proteins, and understanding these processes is essential for understanding the biology of living organisms.