1. Most of the work in the body is done by proteins. Describe the function of each of these proteins: a. Carrier – Facilitate many forms of cell membrane transport, including endocytosis. b. Recognition – Identify the cell as self to immune system. c. Antibodies – Bind to and disable infectious viruses and bacteria. d. Structural – Make up connective tissues such as ligaments and tendons. e. Hormones – Deliver messages throughout the body. f. Enzymes – Speed up the rate of chemical reactions within the body. 2. What are polypeptides ? -Proteins that are made of one or more chains of amino acids. a. What is the primary structure of a polypeptide? - A complex three-dimensional structure. 3. How does the nucleus control the cell’s activity? - The nucleus is able to control the cell by directing the amount and types of proteins produced by the ribosomes in the cytoplasm and rough endoplasmic reticulum. a. What is this process called? -Protein synthesis. DNA Structure 4. What are the three components of nucleotides? - A sugar, a phosphate group, and a nitrogenous base. a. Which is the only part that plays a direct role in building proteins? -The nitrogenous base.
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