Question

question 18
warts can result when certain viruses cause skin cells to reproduce at a high rate. although, not necessarily cancer, this rapid reproduction of skin cells is due to the viruses stimulating uncontrolled

o a cellular digestion.
o b mitotic cell division
o c binary fission.
o d synthesis processes

question 19
please place the steps of the cell cycle for a new cell in order from first (on top) to last (on bottom)

1. cytokinesis
2. s (synthesis)
3. m (mitosis)
4. g2 (gap 2)
5. g1 (gap 1)

Explanation:

• Question 18:
• Cellular digestion (a) is about breaking down substances in the cell, not related to cell reproduction.
• Mitotic cell division (b) is the process by which somatic (body) cells divide. Skin cells are somatic cells, and when viruses cause uncontrolled mitotic cell division, it can lead to growths like warts.
• Binary fission (c) is a form of asexual reproduction in prokaryotes (e.g., bacteria), not in eukaryotic skin cells.
• Synthesis processes (d) are part of the cell cycle (e.g., DNA synthesis in the S - phase), but the key process for cell reproduction (increase in cell number) is mitotic cell division.
• Question 19:
• The cell cycle order is:
• First, G1 (Gap 1) phase: The cell grows and prepares for DNA synthesis.
• Then S (Synthesis) phase: DNA is replicated.
• Next G2 (Gap 2) phase: The cell prepares for mitosis.
• Then M (Mitosis) phase: The nucleus divides.
• Finally, Cytokinesis: The cell divides into two daughter cells.

Answer:

• Question 18: B. mitotic cell division
• Question 19: 5. G1 (Gap 1), 2. S (Synthesis), 4. G2 (Gap 2), 3. M (Mitosis), 1. Cytokinesis