The Ribosomes synthesize proteins and lipids

A. Resistant survival structures: Bacillus spores, also called endospores, are highly durable, dormant structures formed in response to harsh environmental conditions. They have a thick protective coat, dehydrated core, and DNA-stabilizing proteins, which allow them to survive extreme heat, desiccation, radiation, and chemical disinfectants. Their primary function is survival, not growth or reproduction.

B. Reproductive cells: Spores in Bacillus are not reproductive; they do not produce new bacteria directly. Reproduction in bacteria typically occurs through binary fission. Endospores are a survival mechanism to endure unfavorable conditions and germinate into vegetative cells when the environment becomes favorable.

C. Energy-producing cells: Spores are metabolically inactive and do not produce energy. Their dormant state minimizes metabolic activity, conserving energy and resources until conditions allow the spore to germinate and resume normal cellular functions.

A. Positive-sense RNA: Positive-sense RNA viruses possess genomes that function directly as messenger RNA (mRNA). After entering the host cell, the viral RNA can immediately bind to host ribosomes and begin translation to produce viral proteins. No transcription step is required before protein synthesis, these viruses can rapidly initiate replication once infection occurs.

B. Negative-sense RNA: Negative-sense RNA viruses have genomes that are complementary to mRNA and therefore cannot be translated directly by host ribosomes. Before protein synthesis can occur, the virus must first use an RNA-dependent RNA polymerase to synthesize a complementary positive-sense RNA strand. Only this newly formed RNA can function as mRNA for protein production.

C. Double-stranded RNA: Double-stranded RNA viruses contain both a positive and a negative RNA strand. However, the host cell cannot directly translate the double-stranded genome. The virus must first use viral RNA polymerase enzymes to transcribe the negative strand into a positive-sense RNA that can serve as mRNA for translation.