4.4 Reading

List the three cellular functions that occur in the nucleus.

DNA synthesis, RNA synthesis, and assembly of ribosomal sub-units

Contrast three types of cytoskeletal fibers.

Microtubules are hollow tubes made of protein. Microfilaments are long threads of protein actin. Intermediate filaments are rods that anchor the nucleus and other organelles to their places in the cell.

Describe the organelles found in a eukaryotic cell.

Mitochondria are tiny organelles that transfer energy from organic molecules to ATP. Ribosomes are small, circular organelles that build protein.

Identify two characteristics that make mitochondria different from other organelles.

Mitochondria have their own DNA and the inner membrane contains many folds called cristae.

Explain how the fluid mosaic model describes the plasma membrane.

The fluid mosaic model states that the phospholipid bilayer behaves like a fluid more than it behaves like a solid.