Question

bio.1c.3 contrast the structure of viruses with that of cells, and explain why viruses must use living cells to reproduce.
why must viruses use living cells to reproduce?
bio.1d students will describe the structure of the cell membrane and analyze how the structure is related to its primary function of regulating transport in and out of cells to maintain homeostasis.
bio.1d.1 plan and conduct investigations to prove that the cell membrane is a semi - permeable, allowing it to maintain homeostasis with its environment through active and passive transport processes.
draw the structure of a cell membrane.
bio.1e students will develop and use models to explain the role of the cell cycle during growth,
development, and maintenance in multicellular organisms.
bio.1e.1 construct models to explain how the processes of cell division and cell differentiation produce
and maintain complex multicellular organisms.
draw and label the cell cycle circle chart using the terms interphase, m phase, prophase, metaphase,
anaphase, telophase, cytokinesis, g1, s, & g2.
define:
somatic cells?
what happens in each stage of cell division?
interphase-
g1?
s?
g2?
define and draw a simple illustration of each phase.
prophase:
metaphase:
anaphase:
telophase:

Explanation:

To address the question "Why must viruses use living cells to reproduce?" (a key concept in Biology, specifically in the subfield of Microbiology or Cell Biology):

1. Virus Structure: Viruses are acellular entities. They consist of a nucleic acid (DNA or RNA) core surrounded by a protein coat (capsid), and sometimes an envelope. Unlike cells, they lack cellular structures (e.g., ribosomes, cytoplasm, organelles) and metabolic machinery.
2. Reproduction Requirement: For reproduction, viruses need to synthesize new viral components (nucleic acids, proteins). They lack the enzymes, energy (ATP), and raw materials to do this independently. Living cells provide:

• Host Machinery: Viruses hijack the host cell’s ribosomes, enzymes, and metabolic pathways (e.g., for DNA/RNA replication, protein synthesis).
• Raw Materials: Cells supply nucleotides, amino acids, and energy (ATP) needed to build new viruses.
• Replication Environment: The host cell’s cytoplasm or nucleus provides a suitable environment for viral genetic material to be transcribed, translated, and assembled into new virions.

Answer:

Viruses are non - cellular and lack metabolic machinery (e.g., ribosomes, enzymes) and energy sources to reproduce independently. They must infect living cells to hijack the host’s cellular machinery (ribosomes, replication/transcription enzymes), use the host’s raw materials (nucleotides, amino acids), and rely on the host’s energy (ATP) to synthesize new viral components (nucleic acids, proteins) and assemble into new virions.