Directions: The diagram shows phases in a cell cycle in the order that they occur. Use the diagram to answer the question below.
What type of adult human cell are normally found in the G0 phase?
a
Nerve and brain cells
b
Skin cells
c
Buccal cells
d
All human cells are routinely in this stage
a) Nerve and brain cells
To answer this question, we need to identify which type of adult human cells are normally found in the G0 phase.
The G0 phase is a resting phase, also known as the non-dividing phase or quiescent phase. It is a stage in the cell cycle where cells exit the cell division cycle and enter a state of rest.
Looking at the given answer options:
a) Nerve and brain cells - Nerve and brain cells are known to be in a non-dividing state for most of their lifespan, so they are likely found in the G0 phase.
b) Skin cells - Skin cells undergo continuous cell division, as they need to constantly replace old or damaged cells. Therefore, they are unlikely to be in the G0 phase.
c) Buccal cells - Buccal cells are cells that line the inside of the cheek. Similar to skin cells, they also undergo continuous cell division and are unlikely to be in the G0 phase.
d) All human cells are routinely in this stage - This is not true. Different types of human cells have different proliferation rates and may spend varying amounts of time in the G0 phase, depending on their role and function.
Based on the information provided, the most suitable answer would be option a) Nerve and brain cells.
The G0 phase of the cell cycle refers to a non-dividing state or an exit from the cell cycle. In this phase, cells are not actively preparing for division but instead enter a state of rest or perform their specialized functions.
Based on the given options, the correct answer is a) Nerve and brain cells. Nerve and brain cells are considered as post-mitotic cells, which means they have permanently exited the cell cycle and are typically found in the G0 phase.