What are the key concepts and processes in modern biotechnology, including genetic engineering, DNA manipulation, and the roles of different molecules?

Here are the answers to your questions: 1. c) Transition from empirical practices to molecular-level manipulation. Explanation: Ancient biotechnology involved empirical practices like fermentation for food and drink. Modern biotechnology has evolved to precise manipulation at the molecular level, such as genetic engineering. 2. b) Molecular engineering. Explanation: The practical manipulation of DNA, RNA, and proteins to achieve specific outcomes is the essence of molecular engineering. 3. c) Green biotechnology. Explanation: Green biotechnology focuses on agricultural processes, including the development of genetically modified crops like drought-resistant rice. CRISPR-Cas9 is a tool used in genetic engineering across various fields. 4. b) Join DNA fragments to vectors. Explanation: DNA ligase is an enzyme that catalyzes the formation of phosphodiester bonds, effectively joining DNA fragments together, which is crucial for inserting genes into vectors in recombinant DNA technology. 5. c) Carries genetic information for protein synthesis. Explanation: Messenger RNA (mRNA) carries the genetic code from DNA in the nucleus to the ribosomes in the cytoplasm, where it serves as a template for protein synthesis (translation). 6. d) RNA has ribose and uracil instead of deoxyribose and thymine. Explanation: DNA contains the sugar deoxyribose and the nitrogenous base thymine, while RNA contains the sugar ribose and the nitrogenous base uracil (replacing thymine). 7. c) Catalyze a wide range of reactions efficiently. Explanation: Promiscuous enzymes are valuable in industrial biotechnology because they can catalyze multiple reactions or act on a broad range of substrates, making them versatile and efficient for various industrial processes.