Cell Biology Challenge

What is the primary function of the mitochondria?

• To store genetic information

• To synthesize proteins

• The primary function of the mitochondria is to produce ATP through cellular respiration.

• To regulate cell division

Name two types of cell signaling and briefly describe each.

• Autocrine signaling: cells respond to signals they produce themselves.

• Juxtacrine signaling: direct contact between neighboring cells for communication.

• Neuronal signaling: communication between neurons through synapses.

• Endocrine signaling and paracrine signaling.

What role do tight junctions play in epithelial cells?

• Tight junctions prevent leakage of substances between epithelial cells and maintain cell polarity.

• Tight junctions allow free passage of substances between epithelial cells.

• Tight junctions are responsible for cell division in epithelial cells.

• Tight junctions provide structural support to the epithelial cells.

List the stages of mitosis in the correct order.

• Prophase, Metaphase, Anaphase, Telophase

• Prophase, Telophase, Metaphase, Anaphase

• Metaphase, Anaphase, Prophase, Telophase

• Anaphase, Prophase, Telophase, Metaphase

What is the significance of crossing over during meiosis?

• Crossing over increases genetic diversity by exchanging genetic material between homologous chromosomes.

• Crossing over is a process that eliminates genetic material from chromosomes.

• Crossing over occurs only in mitosis, not meiosis.

• Crossing over reduces genetic diversity by keeping chromosomes identical.

How does cytokinesis differ between mitosis and meiosis?

• Cytokinesis in mitosis produces 4 identical cells; in meiosis, it produces 2 diverse gametes.

• Cytokinesis in mitosis produces 2 identical cells; in meiosis, it produces 4 diverse gametes.

• Cytokinesis in both mitosis and meiosis produces 2 identical cells.

• Cytokinesis occurs only in meiosis, not in mitosis.

What is the function of the endoplasmic reticulum?

• The endoplasmic reticulum is responsible for energy production.

• The endoplasmic reticulum stores genetic material.

• The endoplasmic reticulum transports oxygen in the blood.

• The endoplasmic reticulum synthesizes proteins and lipids.

Describe the difference between paracrine and endocrine signaling.

• Endocrine signaling is only found in plants, while paracrine signaling is only in animals.

• Paracrine signaling affects cells in the same organ, while endocrine signaling affects cells in the same tissue.

• Paracrine signaling uses hormones, while endocrine signaling uses neurotransmitters.

• Paracrine signaling is local (affects nearby cells), while endocrine signaling is systemic (affects distant cells via the bloodstream).

What are the main differences between mitosis and meiosis?

• Mitosis occurs only in gametes; meiosis occurs in somatic cells.

• Mitosis results in 2 identical cells; meiosis results in 4 genetically diverse cells.

• Mitosis involves two rounds of division; meiosis involves one round of division.

• Mitosis results in 4 identical cells; meiosis results in 2 genetically diverse cells.

What is the role of the Golgi apparatus in a cell?

• The Golgi apparatus processes and packages proteins and lipids in a cell.

• The Golgi apparatus transports waste out of the cell.

• The Golgi apparatus is responsible for DNA replication.

• The Golgi apparatus generates energy for the cell.