Question

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

Explanation:

Bacteriophages are viruses that infect bacteria. Their infection mechanism involves injecting their genetic material into the bacterial cell. Among the options, DNA is the genetic material (in most bacteriophages; some have RNA but DNA is a common and key one taught in basic biology regarding phage - bacteria interaction). Proteins are part of the phage's capsid (the protein coat), hormones are not relevant as they are signaling molecules in multicellular organisms (not in phage - bacteria systems), and lipids are not the injected component as phages have a protein - based structure for the capsid (not lipid - based like some enveloped animal viruses).

Answer:

DNA