Question

evaluate
directions: answer the following questions.

1. why is the cell theory an example of how a theory changes over time as new discoveries are made?
2. describe how the endoplasmic reticulum, golgi apparatus, and mitochondria are structurally similar.
3. neurons are specialized cells of the nervous system. neurons have special proteins in their cell membranes that allow them to generate electrical current. are these proteins most likely produced by ribosomes on the rough endoplasmic reticulum, or by ribosomes suspended in the cytoplasm of the cell? explain your answer.
4. which would you predict would have more mitochondria: a muscle cell or a skin cell? explain your answer.
5. turn back to page 5. review your answer to the prompt, \considering what you already know about all types of life. speculate as to what this living thing could be. what part of that living thing is this showing?\. revise your answer with evidence from the lesson.

Explanation:

1. The cell theory has evolved over time. Initially, it stated that all living things are made of cells. As new discoveries were made, like the discovery of cell organelles and more complex cell functions, the theory was refined. For example, the understanding of how cells reproduce and their role in heredity was added later.
2. The endoplasmic reticulum, Golgi apparatus, and mitochondria all have membranes. The endoplasmic reticulum has a network of membranes, the Golgi apparatus has stacks of membrane - bound sacs, and mitochondria have an outer and an inner membrane.
3. Proteins in the cell membrane are most likely produced by ribosomes on the rough endoplasmic reticulum. Proteins that are destined for the cell membrane are synthesized on the rough ER. These proteins are then modified and transported to the membrane. Ribosomes in the cytoplasm mainly produce proteins that function within the cytoplasm.
4. Muscle cells would have more mitochondria. Mitochondria are the powerhouses of the cell, producing ATP. Muscle cells require a large amount of energy for contraction. Whether it's the continuous contraction of cardiac muscle or the voluntary contraction of skeletal muscle, a high energy demand means more mitochondria.
5. Since the content of page 5 is not provided, a specific answer cannot be given. But generally, if the living thing is a plant, for example, evidence from the lesson could be that it has cells (as per the cell theory), it may have chloroplasts (if it is photosynthetic), etc.

Answer:

1. The cell theory changes as new discoveries (e.g., cell functions, reproduction) are made, refining its statements.
2. All have membranes (ER - network, Golgi - sacs, mitochondria - double - membrane).
3. Ribosomes on rough ER; membrane - bound proteins are synthesized there.
4. Muscle cell; needs more energy (ATP) for contraction.
5. No specific answer due to lack of page 5 content.