Cell Cycle and Mitosis

The diagram represents several phases of the cell cycle. During which phase does DNA replication occur?

• G1

• S

• G2

• M

Two DNA molecules are the result of DNA replication. Which of the following is a true statement regarding DNA replication?

• Each DNA molecule has two new strands

• One of the DNA molecules has two new strands while the other has two original strands.

• Each DNA molecule has two original strands

• Each new DNA molecule is made up of one new strand and one original strand.

The diagram represents several phases of the cell cycle. The cell cycle has checkpoints built in to ensure that each cell has met certain criteria before being allowed to move to the next stage. Which statement correctly identifies what happens prior to the cell being allowed to enter the G2 stage of the cell cycle?

• The cell makes RNA.

• The nucleus divides.

• DNA replication occurs.

• The chromosomes align.

The image shows a phase of mitosis. Which stage of mitosis is shown in this image?

• Prophase

• Metaphase

• Anaphase

• Telophase

Which diagram represents a plant cell close to the final stage of mitosis?

• 
• 
• 
• 

The process of mitotic cell division normally results in the production of —

• one cell with the same number of chromosomes as the parent cell.

• four cells with half the number of chromosomes as the parent cell.

• two cells with half the number of chromosomes as the parent cell.

• two cells with the same number of chromosomes as the parent cell.

During replication, DNA molecules separate into single strands, which are then used to construct two identical strands of DNA, one old and one new. This process ensures that the —

• new cells will be genetically diverse from the parent cell.

• parent cell may reabsorb the DNA strands.

• two new cells are genetically identical to the parent cell.

• parent cells use little ATP in the process.

During telophase, a step in the cell cycle, —

• the cell begins to separate into two new cells.

• the cell duplicates its genetic material.

• the nuclear envelope breaks down.

• the chromosomes in the cell begin to move.

The diagram illustrates the process of cell division. What is the significance of anaphase in this process?

• Anaphase ensures that each daughter cell receives half the number of chromosomes as the parent cell.

• Anaphase ensures that each daughter cell receives different chromosomes than the parent cell.

• Anaphase ensures that each daughter cell receives twice as many chromosomes as the parent cell.

• Anaphase ensures that each daughter cell receives the same number of chromosomes as the parent cell.

The life cycle of a frog is illustrated in the diagram. Which statement best explains how the cell cycle is important to the life cycle of the frog?

• It enables frogs to produce tadpoles that are clones.

• It allows frogs to grow, develop, and reproduce.

• It prevents overproduction of frog offspring.

• It ensures the best adapted frog survive and pass on traits to offspring.