Question

a bacteriophage virus causes infection in bacteria by injecting which of the following? lipids hormones proteins dna

Explanation:

Bacteriophages are viruses that infect bacteria. Their structure typically consists of a protein coat (capsid) surrounding genetic material. When a bacteriophage infects a bacterium, it attaches to the bacterial cell surface. Then, it injects its genetic material into the bacterium. Among the options, DNA is genetic material (in many bacteriophages; some have RNA, but DNA is a common and major type among typical phages taught in basic biology). Lipids are part of cell membranes (bacterial or phage envelope if any, but not injected as the main infectious component). Hormones are signaling molecules in multicellular organisms (not relevant here). Proteins are part of the phage structure (like the capsid), but it's the genetic material (e.g., DNA) that gets injected into the bacterium to take over its machinery for phage replication.

Answer:

DNA