Cell structure：练习题

What is the key property of the cell membrane that allows it to regulate the passage of specific substances into and out of the cell?

Ribosomes are essential organelles found in all types of cells (plant, animal, and bacterial). What is their primary function?

A student observes a bacterial cell under a microscope. The actual length of the cell is \(40\,\mu\text{m}\). In the resulting micrograph, the cell measures \(20\,\text{mm}\). Calculate the magnification of the image.

What is the primary function of the nucleus in a eukaryotic cell?

Which row correctly compares the structure and primary function of the large central vacuole found in a mature plant cell with the vacuoles or vesicles typically found in an animal cell?

A student observes a cell under a microscope that has a cell wall, cytoplasm, and plasmids. Identify whether this cell is more likely to be a plant cell or a bacterial cell based on the presence of plasmids.

Calculate the actual size of a chloroplast if its image size is 10 mm and the magnification of the microscope is \(\times 2000\). Give your answer in micrometres (\(\mu\text{m}\)).

Red blood cells and root hair cells are both specialised cells. Explain why the cytoplasm of a root hair cell typically contains a nucleus and numerous mitochondria, while a mature red blood cell in mammals lacks both of these structures.

Identify two organelles found in both typical plant and animal cells. For each organelle, describe its primary function.

Compare the structural adaptations of a palisade mesophyll cell and a root hair cell. For each cell, explain how its specific structural features enable it to carry out its primary function efficiently.