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Chap 5
Week 3 Cell Structure
| Question | Answer |
|---|---|
| The enzyme catalase is an important chemical in the functioning of the: | peroxisomes. |
| A list of the cell fibers from largest to smallest would read: | microtubules, intermediate filaments, microfilaments. |
| The presence of which substance in the cell membrane keeps it from breaking too easily? | Cholesterol |
| The cell extension that contains microfilaments is called: | microvilli. |
| The nucleolus is composed chiefly of: | rRNA |
| Which cell fiber serves as part of our “cellular muscles?” | Microfilament |
| The structure in cells that is associated with the enzymatic breakdown (digestion) of foreign material is the: | Lysosome |
| Which are the organelles that allow for the recycling of amino acids in the cell? | Proteasomes |
| Which of the following does not describe a structure or function of the proteasome? Breaking down abnormal and misfolded proteins released from the ER looks like a hollow cylindrical drum made of protein subunits Requires the small protein called ubiq | All of the above |
| Which of the following recognize and destroy nonself cells? | Immune Cells |
| The largest human cell, measuring about 150 μm, is a: | Female sex cell or ovum |
| Which organelles consist of vesicles that have pinched off from the Golgi apparatus? | Lysosome |
| Which of the following is not a function of the integral membrane proteins? Acting as receptors Signal transduction Identification of “self” All of the above are functions of the integral membrane proteins | All of the above are functions of the integral membrane proteins |
| Which of the following is not true about ribosomes? | Surrounded by a membrane structure |
| The structure that separates the contents of a cell from the surrounding tissue is known as: | Plasma membrane |
| Skin cells (epithelial) are held tightly together by: | desmosomes. |
| Which of the following organelles is considered a nonmembranous organelle? | Ribosome |
| Granules or threads within the nucleus are called: | chromatin. |
| Which of the following is not true of the rough endoplasmic reticulum? It makes lipids and carbohydrates. It is made of broad, flattened sacs. It has many ribosomes attached to it. All of the above are true of rough endoplasmic reticulum. | It makes lipids and carbohydrates. |
| Projections from the cell that move materials and mucus are called: | Cilia |
| The membranous structure containing substances that protect the cell from harm are: ribosomes. lysosomes. peroxisomes. both B and C. | lysosome and peroxisomes. = both B and C. |
| Main cell structures include all of the following except: organelles. plasma membrane. interstitial fluid. cytoplasm. | interstitial fluid. |
| A specialized cell structure that propels the sperm is the: | flagellum. |
| Rafts are stiff groupings of membrane molecules. What is their function? Help organize the various components of the plasma membrane Play an important role in the pinching of a parent cell into two daughter cells Sometimes allow the cell to form depr | All of the above |
| Which cell extension lacks a central pair of microtubules, is not found in blood cells, and functions in the kidney to monitor urine flow? | Primary cilium |
| The identification function of the cell membrane is carried out by the | glycoprotein molecules |
| The cell extension that assists epithelial cells in absorption is called: | microvilli. |
| The barrier function of the plasma membrane is accomplished by the: | phospholipid bilayer. |
| ATP production occurs within which organelle? | Mitochondrion |
| Which organelle processes and packages material to be secreted? | Golgi apparatus |
| The fundamental organizational unit of life is the: | Cell |
| Damage to the centrosome and centrioles in a cell would have the greatest impact on which cell function? | Cell Division |
| The inner membrane of what double-membrane structure is contorted into folds called cristae? | Mitochondrion |
| The ____ is often called the microtubule organizing center. | centrosome |
| DNA is a major constituent of which cell organelle? | Nucleus |
| In the matrix of the plasma membrane, a variety of proteins are embedded. Some of these proteins serve as passageway for Na+ ions or glucose. These proteins are called | transport proteins. |
| Which of the following cytoskeleton elements are the largest in diameter? | microtubules |
| This organelle is primarily a sac of powerful digestive enzymes called acid hydrolases. | lysosome |
| Often referred to as the “power plant” of the cell, which organelle is the site of ATP production? | mitochondrion |
| Which type of junction is formed when membrane channels of adjacent plasma membranes adhere to each other? | gap junction |
| Which of the following is not a cytoskeleton element? | centriole |
| The plasma membrane is composed of all of the following except | tubulin protein. |
| Ribosomes are organelles that | float in the cytoplasm and attach to the endoplasmic reticulum. |
| Which of the following is a type of cell extension that lines the intestines and other areas of the body? | microvilli |
| A major function of the cell membrane is to | control what enters and leaves the cell. |
| This membranous organelle is the site of protein synthesis for proteins that are secreted by the cell. | rough endoplasmic reticulum |
| This organelle is numerous in liver and kidney cells. | peroxisome |
| Of the following, the only organelle that has a double membrane structure is the | mitochondrion. |
| The inside of the cell is composed largely of a gel-like substance called | cytoplasm. |
| Which area of the cytoplasm near the nucleus coordinates the building and breaking of microtubules in the cell? | centrosome |
| This organelle has both a cis and a trans face. | Golgi apparatus |
| A spherical membrane-bound structure that contains the genetic material of the cell and is often referred to as the “command center” of the cell is the | nucleus. |
| Phospholipids of the plasma membrane are arranged | as a bilayer with their nonpolar tails sandwiched between the polar heads. |
| This organelle is characterized by folded membranes called cristae. | mitochondria |
| Ribosomes may be either free within the cytoplasm or bound to a membrane system known as the | rough endoplasmic reticulum. |
| Which of the following statements about integral proteins in the plasma membrane is false? | They are more abundant by volume than the membrane phospholipids. |
| The outer boundary of a human cell is called the | plasma membrane. |
| Cisternae of this organelle are continuous with the nuclear envelope. | rough endoplasmic reticulum |
| This organelle primarily modifies products from the rough ER, and it resembles a stack of hollow saucers, one cupped inside the next. | Golgi apparatus |
| This membranous organelle contains oxidase and catalase enzymes. | peroxisome |
Created by:
Crystal C
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