Eukaryotic Cell Cycle Quiz

What is the main purpose of the cell cycle in eukaryotic cells?

• To produce energy

• To divide and form two daughter cells

• To synthesize proteins

• To eliminate waste

Answer explanation

The main purpose of the cell cycle in eukaryotic cells is to divide and form two daughter cells, ensuring proper growth and reproduction. Other options like energy production and waste elimination are not the primary functions of the cell cycle.

Which phase of the cell cycle involves the synthesis of DNA?

• G₁ phase

• S phase

• G₂ phase

• M phase

Answer explanation

The S phase of the cell cycle is where DNA synthesis occurs, allowing the cell to replicate its genetic material in preparation for cell division.

What occurs during the G₁ phase of the cell cycle?

• DNA replication

• Cell growth and synthesis of new proteins

• Preparation for mitosis

• Division of the cell's nucleus

Answer explanation

During the G₁ phase, the cell grows and synthesizes new proteins necessary for DNA replication and cell function. This phase is crucial for preparing the cell for subsequent stages of the cell cycle.

What is the role of cytokinesis in the cell cycle?

• Division of the cell's nucleus

• Division of the cell's cytoplasm

• DNA replication

• Protein synthesis

Answer explanation

Cytokinesis is the process that follows mitosis, where the cell's cytoplasm divides, resulting in two separate daughter cells. This is distinct from mitosis, which involves the division of the nucleus.

What is the shortest phase of the cell cycle?

• G₁ phase

• S phase

• G₂ phase

• M phase

Answer explanation

The G₂ phase is the shortest phase of the cell cycle, occurring after DNA synthesis (S phase) and before mitosis (M phase). It primarily involves preparation for cell division, making it shorter than G₁ and S phases.

What occurs during the M phase of the cell cycle?

• DNA replication

• Cell growth

• Cell division

• Protein synthesis

Answer explanation

During the M phase of the cell cycle, cell division occurs, which includes processes like mitosis and cytokinesis. This is when the cell separates its duplicated DNA and cytoplasm to form two new cells.

Which phase of mitosis involves the chromosomes lining up across the center of the cell?

• Prophase

• Metaphase

• Anaphase

• Telophase

Answer explanation

During metaphase, chromosomes align at the cell's equatorial plane, ensuring they are positioned for separation. This is a key step in mitosis, distinguishing it from prophase, anaphase, and telophase.

During which phase of mitosis do sister chromatids separate?

• Prophase

• Metaphase

• Anaphase

• Telophase

Answer explanation

During anaphase, the sister chromatids are pulled apart to opposite poles of the cell, marking their separation. This is a crucial step in ensuring that each daughter cell receives an identical set of chromosomes.

What is the role of cytokinesis in cell division?

• DNA replication

• Separation of the cytoplasm

• Chromosome alignment

• Nuclear envelope breakdown

Answer explanation

Cytokinesis is the process that follows mitosis, where the cytoplasm of a parental cell is divided into two daughter cells. This separation of the cytoplasm is crucial for completing cell division.

Why do cells divide instead of growing larger?

• To increase surface area to volume ratio

• To decrease energy consumption

• To reduce genetic material

• To avoid nutrient absorption

Answer explanation

Cells divide to increase their surface area to volume ratio, which enhances nutrient absorption and waste removal. Larger cells would have a lower ratio, making it inefficient for these processes.