Answer the following question given this paragraph: A lever is a simple machine that consists of a bar that rotates around a fixed point called the fulcrum. There are three classes of levers. Depending on its class, a lever may have an ideal mechanical advantage that is less than, equal to, or greater than 1. First-class levers also change the direction of the input force. Q: What simple machine consists of a bar that rotates around a fixed point called the fulcrum? Choices: - battering ram - rotor - catapult - lever A:
lever
(Question)
Answer the following question given this paragraph: Q: Insulin is made up of how many polypeptide chains? Choices: - three - four - twelve - two A:
(Answer)
two
Ques: Answer the following question given this paragraph: Enzymes are proteins that increase the rate of biochemical reactions. Enzymes aren't changed or used up in the reactions, so they can be used to speed up the same reaction over and over again. Enzymes are highly specific for certain chemical reactions, so they are very effective. A reaction that would take years to occur without its enzyme might occur in a split second with the enzyme. Q: What are proteins that increase the rate of biochemical reactions? Choices: - metabolites - hormones - amino acids - enzymes A:
Ans: enzymes
(Q).
Answer the following question given this paragraph: 4.4 Muscle Tissue and Motion The three types of muscle cells are skeletal, cardiac, and smooth. Their morphologies match their specific functions in the body. Skeletal muscle is voluntary and responds to conscious stimuli. The cells are striated and multinucleated appearing as long, unbranched cylinders. Cardiac muscle is involuntary and found only in the heart. Each cell is striated with a single nucleus and they attach to one another to form long fibers. Cells are attached to one another at intercalated disks. The cells are interconnected physically and electrochemically to act as a syncytium. Cardiac muscle cells contract autonomously and involuntarily. Smooth muscle is involuntary. Each cell is a spindle-shaped fiber and contains a single nucleus. No striations are evident because the actin and myosin filaments do not align in the cytoplasm. Q: Skeletal, cardiac, and smooth are the three types of what cells and possess morphologies correlated with their functions? Choices: - cartilage tissue - organ - bone - muscle A:
(A).
muscle
Ques:Answer the following question given this paragraph: Vitamins are organic compounds that are essential in very small (trace) amounts for the maintenance of normal metabolism. They generally cannot be synthesized at adequate levels by the body and must be obtained from the diet. The absence or shortage of a vitamin may result in a vitamin-deficiency disease. In the first half of the 20th century, a major focus of biochemistry was the identification, isolation, and characterization of vitamins. Despite accumulating evidence that people needed more than just carbohydrates, fats, and proteins in their diets for normal growth and health, it was not until the early 1900s that research established the need for trace nutrients in the diet. Because organisms differ in their synthetic abilities, a substance that is a vitamin for one species may not be so for another. Over the past 100 years, scientists have identified and isolated 13 vitamins required in the human diet and have divided them into two broad categories: the fat-soluble vitamins, which include vitamins A, D, E, and K, and the water-soluble vitamins, which are the B complex vitamins and vitamin C. All fatsoluble vitamins contain a high proportion of hydrocarbon structural components. There are one or two oxygen atoms present, but the compounds as a whole are nonpolar. In contrast, water-soluble vitamins contain large numbers of electronegative oxygen and nitrogen atoms, which can engage in hydrogen bonding with water. Most water-soluble vitamins act as coenzymes or are required for the synthesis of coenzymes. The fatsoluble vitamins are important for a variety of physiological functions. The key vitamins and their functions are found in Table 18.8 "Fat-Soluble Vitamins and Physiological Functions" and Table 18.9 "Water-Soluble Vitamins and Physiological Functions". Table 18.8 Fat-Soluble Vitamins and Physiological Functions Vitamin. Q: Vitamins are organic compounds that are essential in very small amounts for the maintenance of normal what? Choices: - respiration - pigments - calcium - metabolism A:

Ans:metabolism
Ques: Answer the following question given this paragraph: Nonmetals are elements that generally do not conduct electricity. They are one of three classes of elements (the other two classes are metals and metalloids. ) Nonmetals are the second largest of the three classes after metals. They are the elements located on the right side of the periodic table. Q: What are elements that generally do not conduct electricity? Choices: - copper - metal - iron - nonmetals A:
Ans:
nonmetals