The microbial process of converting sugars to alcohol is known as

A. Bacteriophages infect eukaryotic cells and replicate only through budding: Bacteriophages specifically infect prokaryotic cells, particularly bacteria, not eukaryotic cells. Budding is a replication and release mechanism typical of some enveloped animal viruses, not bacteriophages. Phages typically assemble inside bacteria and are released by lysis.

B. Bacteriophages are free-living organisms capable of independent metabolism: Bacteriophages are obligate intracellular parasites and lack the cellular machinery necessary for independent metabolism. They depend entirely on the host bacterium’s ribosomes, enzymes, and energy sources to replicate.

C. Bacteriophages infect fungi and reproduce by spore formation: Fungi are eukaryotic organisms and are not hosts for bacteriophages. Spore formation is a reproductive strategy of fungi and some bacteria, not viruses. Phages replicate through lytic or lysogenic mechanisms within bacterial cells.

D. Bacteriophages infect bacteria and may undergo lytic or lysogenic cycles: Bacteriophages are viruses that specifically infect bacterial cells. After infection, they may immediately replicate and lyse the host (lytic cycle) or integrate their genetic material into the host genome as a prophage (lysogenic cycle). This dual capability defines many temperate phages.

E. Bacteriophages are intracellular parasites that lack nucleic acid: All viruses, including bacteriophages, contain nucleic acid (either DNA or RNA) as their genetic material. The nucleic acid is enclosed within a protein capsid and is essential for viral replication within the host.

A. Discovery of ribosomes as non-membranous organelles: Ribosomes are intracellular structures responsible for protein synthesis and are not surrounded by membranes. While their discovery expanded understanding of cellular components, it did not contradict classical cell theory, which focuses on cells as the basic structural and functional units of life.

B. Identification of multinucleated skeletal muscle fibers: Classical cell theory posits that a cell has a single nucleus and functions as an autonomous unit. The presence of multinucleated skeletal muscle fibers, also called syncytia, challenged this notion This observation revealed that some cells can deviate from “one nucleus per cell” concept, prompting refinement of the theory.

C. Observation that all living organisms metabolize ATP: While ATP metabolism is a universal feature of living cells, this observation supports rather than challenges cell theory. It reinforces the concept that cells are the basic functional units responsible for life-sustaining biochemical processes.

D. Recognition that membranes are composed of phospholipid bilayers: Identifying the phospholipid bilayer structure of membranes clarified how cells maintain compartmentalization and selective permeability. This structural insight complements classical cell theory and does not contradict the fundamental principles regarding cellular organization.