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Organelless
Organelles
| Question | Answer |
|---|---|
| Lysosomes are membranous sacs that contain acid hydrolases. These are the sites of intercellular digestion. | Lysosome |
| A stack of smooth membrane sacs and associated vesicles that are close to the nucleus. The apparatus packages, modifies, and segregates proteins for secretion from the cell. for inclusion in lysosomes, and for incorption into the plasma membrane. | Golgi apparatus |
| These paired cylindrical bodies are each composed of nine triplets of microtubules. They organize a microtubule network during mitosis to form the spindle and asters and the bases of cilia and flagella. | Centrioles |
| The sum of all this internal chemical change. | Metabolism |
| Microscopic structures in a cell that carry out its individual function. Examples: mitochondria, centrioles and lysosomes. | Organelles |
| A membranous system of sacs and tubules. It is free of ribosomes and is the site of lipid and steroid synthesis, lipid metabolism, and drug detoxification. | Smooth endoplasmic reticulum (ER) |
| A granular, threadlike material that is composed of DNA and histone proteins. DNA constitutes the genes. | Chromatin |
| The composition of these protein fibers varies. The stable cytoskeletal elements resist mechanical forces acting on the cell. | Intermediate filaments |
| Fine filaments of the contracile protein actin. They are involved in muscle contraction and with other types of intracellular movement. They help form the cells cytoskeleton, cilia and flagella, if present. | Microfilament |
| These minute, finger like extensions arise from the plasma membrane surface. They help to increase the surface area of the cell and are primarily used for absorption. | Microvilli |
| A double-membrane structure which is pierced by the pores. The outer membrane is continuos with the endoplasmic reticulum. | Nuclear envelope |
| This is the largest organelle and is surrounded by the nuclear envelops. It contains the nucleoplasm, nucleoli and the chromatin (DNA). It acts as the control center of the cell and is responsible for the instruction for protein synthesis. | Nucleus |
| A small dense body within the nucleus. It is composed of ribosomal RNA and proteins and is the site of ribosome subunit manufacture. | Nucleolus |
| Membranous sacs of oxidase enzymes. The enzymes detoxify a number of toxic substances. The most important enzyme, catalase, breaks down hydrogen peroxide. | Peroxisome |
| Dense particles that consist of two subunits, each composed of ribosomal RNA and protein. They may be free or attached to the rough endoplasmic reticulum and are the sites of protein synthesis. | Ribosomes |
| This membrane system encloses a cavity, the cisterna and coils through the cytoplasm. It is externally studded with ribosomes. Sugar groups are attached to proteins within the cisternae; proteins are bound in vesicles for transport to the Golgi. | Rough endoplasmic reticulum (ER) |
| Substances are secreted or ejected from a cell through the use of a vesicle. | Secretion-exocytosis |
| The ability to maintain internal stability | Homeostasis |
| Rod-like, double membrane structures. This inner membrane is folded into projections called cristae. This is the site of ATP synthesis and is called the powerhouse of the cell. | Mitochondrion |
| Cylindrical structures made of tubulin proteins. They are involved in intracellular and cellular movements and form centrioles. | Micotuble |
Created by:
TracyFriedman