Final answer:
During the G1 phase of the cell cycle, an increase in organelle density and enzymatic activity is expected in animal cells as the cell prepares for DNA synthesis and division, while cell wall components and chlorophyll are not applicable to animal cells.
Step-by-step explanation:
The question pertains to the changes in cellular features during the G1 phase compared to the M phase of the cell cycle. In the G1 phase, cells increase in size, perform their normal activities, and prepare for DNA synthesis. This involves an increase in enzymatic activity and organelle density, as the cell must produce more organelles and enzymes to support growth and the upcoming DNA replication in the S phase. Unlike plant cells, animal cells do not have a cell wall or chlorophyll, therefore any answers suggesting an increase in these components would not be applicable to animal cells.
During the M phase or mitosis, cells focus on division, which includes the distribution of duplicated genetic material into two daughter cells. Since cell growth and normal cellular activities are not priorities during the M phase, one would expect a higher organelle density and enzymatic activity during the G1 phase when compared to the M phase.