BIO 165: Anatomy & Physiology I
| Stanly Community College
| Emily Mansfield
Lecture Activity #3: Cells (Chapter 3)
Instructions: Read chapter 3 in your textbook and review the lecture notes and study resources provided by your instructor. Type your answer in the answer block provided for each question. Answer blocks should expand as you type. If you experience difficulty typing in the provided answer blocks, you may type your answers in a new document. Save a copy of the completed activity to your computer for your records. Although this activity is not graded, your instructor reserves the right to require students to submit their completed work at any time throughout the semester. Short Answer Questions
1. Explain why mitosis can be thought of as cellular immortality? Mitosis is a process in which cells replicate their DNA to create new cells that are genetically identical. The DNA is propagated throughout the new cells and the genetic information is “immortalized”.
2. Contrast the roles of ER-bound ribosomes with those free in the cytosol. Free ribosomes synthesize soluble proteins that function in cytosol or other organelles.Membrane-bound ribosomes (forming rough ER) synthesize proteins to be incorporated into membranes, lysosomes, or exported from the cell.
3. Cells lining the trachea have whip-like motile extensions on their free surfaces. What are these extensions, what is their source, and what is their function? The trachea’s free surface is covered with cilia. These ciliated cells propel mucus full of dust particles and bacteria upward away from the lungs. They help keep the respiratory system free of debris and potentially harmful bacteria.
4. Name the three phases of interphase and describe an activity unique to each phase. 3 phases of Interphase: * G1 – the centrioles begin replicating * S – DNA is replicated * G2 – final preparations for mitosis are completed and...
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