5. Which of the following statements regarding the applications and techniques of proteomics is correct?
(A) Western blotting utilizes labeled DNA probes to detect the presence of specific protein targets.
(B) The proteome is defined as the total number of genes encoded within an organism's complete genome.
(C) SDS-PAGE primarily separates protein molecules based on their intrinsic charge rather than their molecular weight.
(D) Phage display technology can be employed to investigate interactions between proteins and other molecules.
(E) Protein microarrays are limited to detecting the purity of isolated proteins rather than their functional activities.

6. Histone acetylation is generally associated with gene activation. What is the primary molecular mechanism underlying this phenomenon? (A) Acetylation neutralizes the positive charge on lysine residues, weakening the electrostatic attraction to the negatively charged DNA backbone and creating a more open chromatin structure. (B) The addition of acetyl groups increases hydrophobicity, thereby strengthening the Van der Waals forces between histones and DNA to stabilize the nucleosome. (C) Acetylation acts as an enzymatic cofactor that directly catalyzes the phosphorylation of RNA Polymerase II to initiate transcription elongation. (D) Acetyl marks specifically recruit DNA methyltransferases to promote CpG island methylation, effectively locking the gene in a silenced state. (E) Acetylation serves as an irreversible signal that targets histones for degradation via the ubiquitin-proteasome pathway, clearing the DNA for transcription.

7. What is the original evolutionary function of the CRISPR-Cas9 system in bacteria? (A) To serve as a mechanism for repairing spontaneous DNA mutations within the genome. (B) To regulate the expression of the bacteria's own metabolic genes during starvation. (C) To facilitate the conjugation process and horizontal gene transfer between bacteria. (D) To act as an adaptive immune system that memorizes and cleaves foreign DNA from phages. (E) To assist in the structural formation of endospores during extreme environmental stress.

8. If two plasmids belong to the same "Incompatibility group," what does this imply? (A) They will inevitably fuse together via recombination to form a single large megaplasmid. (B) They cannot stably coexist in the same cell because they compete for the same replication or partitioning mechanisms. (C) They encode restriction enzymes that will specifically degrade the DNA of the opposing plasmid. (D) They originate from completely different bacterial species and cannot function in the current host. (E) They both carry identical antibiotic resistance genes, rendering one of them functionally redundant.

9. For bacteriophages, the decision to enter the "Lytic" or "Lysogenic" cycle typically involves which key factor? (A) The metabolic state and health of the host cell. (B) The magnitude of temperature fluctuations in the surrounding environment. (C) The physical size of the viral capsid relative to the host cell's volume. (D) The intensity of ultraviolet light exposure present in the environment. (E) Whether the bacteriophage genome encodes specific antibiotic resistance genes.

10. Beyond DNA repair, what is the primary evolutionary significance of crossing over during meiosis? (A) It significantly reduces the overall mutation rate across the genome. (B) It ensures that the chromosome number is correctly doubled for the daughter cells. (C) It breaks the linkage of genes on the same chromosome, creating new allelic combinations. (D) It functions to systematically eliminate all recessive deleterious alleles from the population. (E) It serves to extend the length of telomeres to prevent cellular senescence.

11. Why is mitochondrial DNA (mtDNA) frequently used in evolutionary studies? (A) It has an extremely low mutation rate, making it suitable for studying events from billions of years ago. (B) It shows maternal inheritance and a relatively fast mutation rate, making it suitable for studying recent evolution. (C) It contains the complete genetic information of the organism, replacing the need for nuclear DNA analysis. (D) It is highly conserved and undergoes absolutely no mutations throughout the evolutionary process. (E) It is universally present in all biological entities, including all known families of viruses.

12. Which statement regarding "Retrotransposons" is correct? (A) They move within the genome using a "cut and paste" mechanism similar to DNA transposons. (B) Their movement does not result in any net increase in the total number of transposons in the genome. (C) They are found exclusively in prokaryotic organisms and are absent in eukaryotes. (D) They are capable of moving autonomously without requiring any host-derived or self-encoded enzymes. (E) Their transposition process involves an RNA intermediate and the enzyme reverse transcriptase.

13. Which of the following is correct regarding the mechanism of RNA interference (RNAi)? (A) RNAi is a gene silencing phenomenon triggered by single-stranded DNA (ssDNA) fragments. (B) The Dicer enzyme is responsible for cleaving long double-stranded RNA into small siRNA fragments. (C) The Slicer enzyme functions primarily to transport miRNA out of the nucleus into the cytoplasm. (D) The RISC complex is primarily responsible for repairing damaged mRNA sequences in the ribosome. (E) The RNAi phenomenon was originally discovered as an immune mechanism in bacterial cells.

14. Which statement concerning translation and the genetic code is accurate? (A) A codon is defined as a sequence of three nucleotides located on the tRNA molecule. (B) All types of RNA transcribed in the nucleus are eventually translated into proteins. (C) Aminoacyl-tRNA synthetases are responsible for attaching specific amino acids to the acceptor stem of tRNA. (D) Peptide bonds are the primary covalent bonds connecting the two strands of the DNA double helix. (E) Release factors function by increasing the efficiency of tRNA charging during elongation.

15. Which statement regarding the human genome structure or genomic techniques is correct? (A) Exon trapping relies on the presence of flanking splice sites to identify coding regions. (B) Protein-coding genes constitute the vast majority (over 90%) of the human genome sequence. (C) The bacterium E.coli possesses approximately 25,000 genes, similar to humans. (D) All plant genomes are significantly smaller in size compared to the human genome. (E) Radiation hybrids are defined as eukaryotic cells that have been infected with viral DNA.

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