18. Which statement listed below regarding a proteome or a transcriptome is correct? 　 1. A proteome is a collection of all the proteins produced in a given cell or tissue. 　 2. A proteome is an improperly digested protein responsible for certain diseases such as "mad cow" disease. 　 3. A transcriptome will reflect the protein expression levels for all expressed genes. 　 4. A transcriptome is a collection of all the genes being transcribed in a given cell or tissue at a given time. 　 5. A transcriptome is the mRNA transcribed to produce a fusion protein. (A) 1 and 4 are correct. (B) 2, 3 and 5 are correct. (C) 1, 4 and 5 are correct. (D) 1, 3 and 4 are correct. (E) All of above are correct.