Question

(a) q1 biology comprehensive assessment
cell structure and function

1. which of the following is not a principle of cell theory?

a. cells are the basic units of life. b. all living things are made of cells.
c. very few cells reproduce. d. all cells are produced by existing cells.

1. list 2 characteristics that all cells have whether they are eukaryotic or prokaryotic.
2. what type of cell is bacterial?
3. what cell structure regulates the passage of materials in and out of the cell?
4. which list represents the levels of organization in a multicellular organism from the simplest level to the most complex level?

a. cell, tissue, organ system b. organ system, organ, tissue, cell
c.tissue, organ, organ system d. cell, tissue, organ, organ system

1. which characteristic do all prokaryotic cells and eukaryotic cells have in common? a. cell wall b. nucleus c. organelles d. cell membrane
2. which characteristic is not common to both prokaryotic cells and eukaryotic cells? a. cytoplasm b. reproduction c. nucleus d. cell membrane
3. in general, eukaryotic cells are

a. smaller than prokaryotic cells. b. larger than prokaryotic cells.

1. why is homeostasis important to survival?

feedback mechanisms

1. regulation of calcium levels in the blood by parathyroid hormone.

a. negative feedback b. positive feedback

Explanation:

1. The cell - theory principles state that cells are the basic units of life, all living things are made of cells, and all cells are produced by existing cells. So, "Very few cells reproduce" is not a principle.
2. All cells have a cell membrane to regulate the passage of substances and genetic material (DNA or RNA).
3. Bacteria are prokaryotic cells as they lack a true nucleus.
4. The cell membrane regulates the movement of materials in and out of the cell.
5. In a multicellular organism, the levels of organization from simplest to most complex are cell, tissue, organ, organ - system.
6. Both prokaryotic and eukaryotic cells have a cell membrane.
7. Prokaryotic cells lack a nucleus, while eukaryotic cells have one. So, the nucleus is not common to both.
8. Eukaryotic cells are generally larger than prokaryotic cells.
9. Homeostasis is important for survival as it maintains a stable internal environment for cells to function properly.
10. The regulation of calcium levels in the blood by parathyroid hormone is a negative - feedback mechanism as it works to maintain a stable calcium level.

Answer:

1. c. Very few cells reproduce.
2. Cell membrane, genetic material.
3. Prokaryotic.
4. Cell membrane.
5. d. Cell, tissue, organ, organ system.
6. d. cell membrane.
7. c. nucleus.
8. B. larger than prokaryotic cells.
9. It maintains a stable internal environment for cell - function.
10. A. Negative Feedback