Biology Section 4-3 Review: Cell Organelles and Features

What is the cytoskeleton, and what are three of its major components?

A network of thin tubes and filaments that crisscrosses the cytosol; microtubules, microfilaments, and intermediate filaments.

What roles do membrane proteins play in transporting only certain substances into a cell?

Based on the size of the substance and compatibility

Cilia Flagella

Cilia-Hairlike structure arranged in tightly packed rows Flagella-Long hairlike structure that grows out of a cell.

Cytoskeleton Microtubule

Cytoskeleton-Region of the cell within the membrane that includes the fluid Microtubule-One of the small, tubular fibers composed of the protein tubulin that are found in the cytoplasm of eukaryotic cells.

Nucleoplasm Nuclear envelope

Nucleoplasm-Nucleus filled with a jellylike liquid Nuclear envelope-Double membrane that surrounds the nucleus of a eukaryotic cell.

What are ribosomes made of? What cellular function are they involved in?

Ribosomes are organelle made of protein and RNA that direct protein synthesis in the cytoplasm. Protein synthesis; used to make other proteins

This diagram represents a typical animal cell. Label each part of the figure in the spaces provided.

a. Mitochondrion b. Nucleus c. Nucleolus d. Golgi apparatus e. Rough ER f. Ribosomes

Substances produced in a cell and exported outside of the cell would pass through the

a. endoplasmic reticulum and Golgi apparatus

Viruses, bacteria, and old organelles that a cell ingests are broken down in

b. lysosomes

Cells that have a high energy requirement generally have many

c. mitochondria

Organelles that are surrounded by two membranes and contain DNA are the

c. nucleus and mitochondria

The plasma membrane

d. is composed mainly of a lipid bilayer