Answer the following question given this paragraph: Skeletal Muscle Fiber Structure Each skeletal muscle fiber is a skeletal muscle cell. These cells are incredibly large, with diameters of up to 100 m and lengths of up to 30 cm. The plasma membrane of a skeletal muscle fiber is called the sarcolemma. The sarcolemma is the site of action potential conduction, which triggers muscle contraction. Within each muscle fiber are myofibrilslong cylindrical structures that lie parallel to the muscle fiber. Myofibrils run the entire length of the muscle fiber, and because they are only approximately 1.2 m in diameter, hundreds to thousands can be found inside one muscle fiber. They attach to the sarcolemma at their ends, so that as myofibrils shorten, the entire muscle cell contracts (Figure 38.34). Q: The plasma membrane of a skeletal muscle fiber is called the what? Choices: - sheath - annulata - soleus - sarcolemma A:
sarcolemma
Answer the following question given this paragraph: Ionic bonds are electrostatic attractions between two oppositely charged ions. Ions can be formed and then bonded when metal atoms donate their valence electrons to nonmetal atoms. Q: Ionic bonds are electrostatic attractions between two oppositely charged what? Choices: - molecules - gasses - compounds - ions A:
ions
Q: Answer the following question given this paragraph: Transporting blood is the main job of the heart and blood vessels. Q: Transporting blood is the main job of the heart and what? Choices: - bones - areolas - lymphatic system - blood vessels A:
A: blood vessels
Question: Answer the following question given this paragraph: Mutations can result in errors in protein sequence, creating partially or completely non-functional proteins. These can obviously result in harm to the cell and organism. To function correctly and maintain homeostasis , each cell depends on thousands of proteins to all work together to perform the functions of the cell. When a mutation alters a protein that plays a critical role in the cell, the cell, tissue, organ, or organ system may not function properly, resulting in a medical condition. A condition caused by mutations in one or more genes is called a genetic disorder or genetic disease. However, only a small percentage of mutations cause genetic disorders; most have no impact on health. If a mutation does not change the protein sequence or structure, resulting in the same function, it will have no effect on the cell. Often, these mutations are repaired by the DNA repair system of the cell. Each cell has a number of pathways through which enzymes recognize and repair mistakes in DNA ( Figure below ). Because DNA can be damaged or mutated in many ways, the process of DNA repair is an important way in which the cell protects itself to maintain proper function. Q: What do you call a condition caused by mutations in one or more genes? Choices: - intrinsic disorder - mutation disorder - evolutionary disorder - genetic disorder A:
Answer: genetic disorder
*Question*
Answer the following question given this paragraph: CHAPTER SUMMARY 3.1 How Cells Are Studied A cell is the smallest unit of life. Most cells are so small that they cannot be viewed with the naked eye. Therefore, scientists must use microscopes to study cells. Electron microscopes provide higher magnification, higher resolution, and more detail than light microscopes. The unified cell theory states that all organisms are composed of one or more cells, the cell is the basic unit of life, and new cells arise from existing cells. Q: Which theory states that all organisms are composed of one or more cells, the cell is the basic unit of life, and new cells arise from existing cells? Choices: - theory of evolution - microcellular theory - natural selection - unified cell theory A:
**Answer**
unified cell theory
Q: Answer the following question given this paragraph: Accuracy means making measurements that are close to the true value. Q: What is making measurements that are close to the true value known as? Choices: - estimation - frequency - prediction - accuracy A:
A: accuracy