Chapter 6 Review

The cell cycle, including mitosis and cell division, is important to all organisms.

What life function occurs as the result of mitosis in multicellular organisms?

• binary fission

• reproduction

• production of gametes

• growth, maintenance, and repair

As a cell grows larger, it will eventually go through cell division.

The process of cell division results in one cell

• having DNA while the other cell lacks DNA.

• dividing into two daughter cells.

• dividing into three daughter cells.

• dividing into cells incapable of going through cell division again.

The process by which DNA copies itself is called DNA replication. Special enzymes are involved in catalyzing the many chemical reactions that occur during this vital process.

What enzyme is responsible for unzipping the original DNA molecule by breaking the hydrogen bonds between the complementary bases?

• RNA polymerase

• DNA polymerase

• DNA ligase

• Helicase

Which is NOT a true statement about the process of DNA replication?

• In the last step of DNA replication, the two strands of DNA "unzip."

• DNA replication is needed so that a new cell receives a copy of the DNA.

• DNA replication occurs within the nucleus of the cell.

• Each new double helix of DNA contains one strand from the original molecule and one newly created strand.

The diagram shows an animal cell during the process of cell division, called mitosis. The shapes along the center represent the chromosomes being pulled apart. Each part will be moved into one of two new cells.

How do the centrosomes assist with this process in animal cells?

• Centrosomes help microtubules assemble, which then move chromosomes.

• Centrosomes provide the energy needed for cell division.

• Centrosomes are the control centers for cell division.

• Centrosomes modify the cell membrane during cell division.

Which of the choices correctly identifies the importance of the process illustrated in the diagram?

• The synthesis of an RNA template must occur before two identical daughter cells can be produced.

• The synthesis of functional proteins is performed by DNA polymerase and is necessary for cells to function.

• Each new cell will have an increased genetic variation due to the synthesis of the DNA.

• In order for each new cell to function properly, it is critical that each cell receives an exact copy of the DNA.

The model illustrates the semiconservative replication of DNA which allows for the reliable transfer of genetic information into newly formed cells.

Which statement best describes this process?

• The two original strands are used as templates and the two new double helices are each made up of one template strand and one new strand.

• Each new double helix contains two original parent strands, allowing for the replication of the entire DNA molecule.

• When a copy of the DNA is produced, the copy is actually a double strand of RNA.

• The newly replicated double helix is a similar, but not identical, copy of the original DNA molecule.

The cell cycle consists of three major stages: interphase, nuclear division, and cytokinesis.

Which pairs of events both occur during interphase?

• The cell grows and its chromosomes split in half and separate.

• The cell synthesizes DNA and its cytoplasm divides.

• The cell's chromosomes split in half and separate and its cytoplasm divides.

• The cell grows and synthesizes DNA.

The cell cycle consists of three major stages: interphase, nuclear division, and cytokinesis.

Which of the events occurs during cytokinesis?

• The cell replicates its DNA.

• The cell grows.

• The cell separates into two daughter cells.

• The cell's chromosomes split in half and separate.

The cell cycle consists of three major stages: interphase, nuclear division, and cytokinesis.

Which of the events occurs during nuclear division?

• The cell grows.

• The cell's DNA divides in half.

• The cell's cytoplasm divides.

• The cell synthesizes DNA.