Mitosis and Cell Biology Quiz

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Questions and Answers

What happens to the nuclear membrane during prophase?

  • The nuclear membrane condenses.
  • The nuclear membrane begins to form.
  • The nuclear membrane breaks down. (correct)
  • The nuclear membrane remains intact.

During which phase do sister chromatids separate?

  • Telophase
  • Prophase
  • Anaphase (correct)
  • Metaphase

Where do chromosomes line up in the cell during metaphase?

  • In the cytoplasm
  • Randomly throughout the cell
  • At the poles of the cell
  • In the middle of the cell (correct)

What structures are responsible for pulling sister chromatids apart during anaphase?

<p>Spindle fibers (B)</p> Signup and view all the answers

During which stage of mitosis does cytokinesis occur?

<p>Telophase (A)</p> Signup and view all the answers

During which phase of mitosis do sister chromatids separate?

<p>Anaphase (D)</p> Signup and view all the answers

What is the primary function of the spindle checkpoint?

<p>Ensure chromosomes are properly aligned at the metaphase plate (A)</p> Signup and view all the answers

What happens to the chromosomes in telophase?

<p>They decondense and become less visible (D)</p> Signup and view all the answers

Which of the following is a characteristic of cytokinesis in animal cells?

<p>Formation of a cleavage furrow (D)</p> Signup and view all the answers

What is the significance of the microtubules attaching to the kinetochores of chromosomes?

<p>It allows for the equal distribution of chromosomes to daughter cells (E)</p> Signup and view all the answers

Which characteristic is unique to prokaryotic cells?

<p>Reproduce by binary fission (C)</p> Signup and view all the answers

What is the main function of the mitochondria?

<p>Site of cellular respiration (C)</p> Signup and view all the answers

Which component is responsible for maintaining cell shape in plant cells?

<p>Cell wall (B)</p> Signup and view all the answers

What is a joint function of the Golgi apparatus and the endoplasmic reticulum?

<p>Package and transport proteins (B)</p> Signup and view all the answers

Which type of transport does NOT require energy input from the cell?

<p>Facilitated diffusion (C)</p> Signup and view all the answers

During which phase of mitosis does the mitotic spindle begin to form?

<p>Early Prophase (A)</p> Signup and view all the answers

What happens to the nuclear envelope during Late Prophase (Prometaphase)?

<p>It breaks down. (A)</p> Signup and view all the answers

Which stage of mitosis involves capturing and organizing chromosomes by the mitotic spindle?

<p>Late Prophase (Prometaphase) (A)</p> Signup and view all the answers

At what point in mitosis do the chromosomes align at the metaphase plate?

<p>Metaphase (A)</p> Signup and view all the answers

In which phase does the cell copy its DNA?

<p>G₁ Phase (End of Interphase) (C)</p> Signup and view all the answers

What is the first step of the cell cycle?

<p>Cell membrane breaks down (A)</p> Signup and view all the answers

Which phase of the cell cycle involves chromatids being pulled apart?

<p>Anaphase (A)</p> Signup and view all the answers

What triggers apoptosis in cells with mutations?

<p>Programmed cell death (B)</p> Signup and view all the answers

What characterizes cancer in the body?

<p>Uncontrolled cell division (B)</p> Signup and view all the answers

What is a mutation?

<p>An abnormal version of a gene (D)</p> Signup and view all the answers

What is the role of stem cells in the body?

<p>They contribute to cell repair (C)</p> Signup and view all the answers

What may occur if the cell cycle functions improperly?

<p>Excessive proteins are produced (A)</p> Signup and view all the answers

What is passive transport?

<p>The movement of molecules across the membrane without energy. (B)</p> Signup and view all the answers

How does active transport differ from passive transport?

<p>Active transport requires energy (ATP). (C)</p> Signup and view all the answers

Which describes the effect on a cell placed in a hypertonic solution?

<p>The cell will shrivel as water moves out. (A)</p> Signup and view all the answers

What is the correct order of stages in mitosis?

<p>Prophase, Metaphase, Anaphase, Telophase (D)</p> Signup and view all the answers

In which phase of the cell cycle does DNA replication occur?

<p>S phase (C)</p> Signup and view all the answers

What happens to a cell in a hypotonic solution?

<p>The cell expands as water enters. (D)</p> Signup and view all the answers

During which stage of the cell cycle does the cytoplasm divide?

<p>Cytokinesis (D)</p> Signup and view all the answers

Which of the following correctly describes isotonic solutions?

<p>The solute concentration is equal to that of the cytoplasm. (A)</p> Signup and view all the answers

Flashcards

Prokaryotic Cells

Cells without a nucleus or membrane-bound organelles, mostly unicellular.

Eukaryotic Cells

Cells that contain a nucleus and have membrane-bound organelles; can be uni- or multicellular.

Cell Membrane

Controls movement in and out of the cell; maintains homeostasis and communication.

Mitochondria

The site of cellular respiration, providing usable energy (ATP) from food.

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Passive Transport

Movement of molecules across the cell membrane without energy input from the cell.

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G₁ Phase

The cell has copied its DNA and centrosome.

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Early Prophase

Cells break/build structures, chromosomes condense, nucleolus disappears.

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Late Prophase

Spindle captures chromosomes, nuclear envelope breaks down.

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Metaphase

Chromosomes align at the metaphase plate, spindle checkpoint occurs.

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Mitotic Spindle

Structure that organizes and segregates chromosomes during mitosis.

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Cell Cycle

A series of events leading to cell division and formation of daughter cells.

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Cytokinesis

The final stage of the cell cycle where the cytoplasm divides, creating two daughter cells.

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Stem Cells

Cells capable of developing into various cell types and contributing to repair.

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Mutation

An abnormal change in a gene caused by a DNA alteration.

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Mutagen

An agent that causes changes in DNA, leading to mutations.

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Cell Cycle Dysfunction

Improper function of the cell cycle can lead to uncontrolled cell division or abnormal proteins.

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Apoptosis

Programmed cell death that removes mutated or damaged cells.

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Cancer

Characterized by uncontrolled cell division due to cell cycle regulation failure.

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Prometaphase

Phase where chromosomes become visible and microtubules capture them.

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Anaphase

Sister chromatids are pulled apart to opposite sides of the cell.

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Telophase

The cell reforms structures, two nuclei form, and chromosomes decondense.

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Active Transport

Movement of molecules across the cell membrane using energy (ATP).

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Concentration Gradient

Difference in concentration of a substance across space.

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Osmosis

Diffusion of water across a semipermeable membrane.

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Hypertonic Solution

Higher solute concentration outside the cell; causes cells to shrivel.

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Hypotonic Solution

Lower solute concentration outside the cell; causes cells to swell.

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Mitosis Stages

Four stages: Prophase, Metaphase, Anaphase, Telophase, where the nucleus divides.

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Prophase

Chromatin condenses into chromosomes; nuclear membrane breaks down, spindle fibers form.

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Spindle fibers

Protein structures that help separate chromosomes during cell division.

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