The nucleolus is always visible during interphase, particularly during the G1, S, and G2 phases of the cell cycle. This is when the cell is actively growing and synthesizing proteins.
A meristematic cell
During the interphase stage of the cell cycle, which includes G1, S, and G2 phases, the cell is not actively dividing. Instead, it is preparing for cell division by growing and replicating its DNA. It is only during the M phase, which includes mitosis and cytokinesis, that the cell actually divides.
the chromosomes are duplicated.
During interphase, the cell is actively growing, carrying out its normal functions, and preparing for cell division. DNA replication occurs, resulting in each chromosome being duplicated. Additionally, organelles are also replicated during this phase.
The oxygen passes through a bloodvessel called artery to an actively respiring muscle cell.
Penicillin targets actively multiplying cells by inhibiting cell wall formation during division. Lysozyme can kill cells at any stage of growth because it disrupts the bacterial cell wall by breaking down peptidoglycan, a key component of the cell wall, leading to cell lysis.
Animal cells actively replicate their genetic material during the S phase of the cell cycle, which occurs prior to cell division. This process ensures that each daughter cell receives a full set of DNA and genetic information.
the bladder
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You would never observe the G0 phase. Skin cells typically do not enter the G0 phase since they are actively dividing to replenish the skin. The G0 phase is a resting phase where cells are not actively dividing.
Some protists use a process called phagocytosis to actively ingest food particles. During phagocytosis, the protist surrounds the food particle with its cell membrane and forms a vesicle, called a food vacuole, to bring the food particle into the cell for digestion.