Answer the following question given this paragraph: Each muscle in the body is made up of cells called muscle fibers. Muscle fibers are long, thin cells that can do something that other cells cannot dothey are able to get shorter. Shortening of muscle fibers is called contraction . Muscle fibers can contract because they are made of proteins, called actin and myosin, that form long filaments (or fibers). When muscles contract, these protein filaments slide or glide past one another, shortening the length of the cell. When your muscles relax, the length extends back to the previous position. Nearly all movement in the body is the result of muscle contraction. Q: Shortening of muscle fibers is called what?' Choices: - diffusion - diffusion - shrinking - contraction A:
contraction
Answer the following question given this paragraph: Leaves are the keys not only to plant life but to virtually all life on land. The primary role of leaves is to collect sunlight and make food by photosynthesis. Leaves vary in size, shape, and how they are arranged on stems. You can see examples of different types of leaves in Figure below . Q: Which is the process through which leaves collect sunlight and make food? Choices: - Greenhouse - compress - richness - photosynthesis A:
photosynthesis
Q: Answer the following question given this paragraph: Lactic acid fermentation converts the 3-carbon pyruvate to the 3-carbon lactic acid (C 3 H 6 O 3 ) (see Figure below ) and regenerates NAD + in the process, allowing glycolysis to continue to make ATP in low-oxygen conditions. Since there is a limited supply of NAD + available in any given cell, this electron acceptor must be regenerated to allow ATP production to continue. To achieve this, NADH donates its extra electrons to the pyruvate molecules, regenerating NAD + . Lactic acid is formed by the reduction of pyruvate. Q: What natural destructive element cuts away at rock forming river valleys? Choices: - sediment - lava - air - water A:
A: water
Question: Answer the following question given this paragraph: The ductless endocrine glands are not to be confused with the body's exocrine system, whose glands release their secretions through ducts. Examples of exocrine glands include the sebaceous and sweat glands of the skin. As just noted, the pancreas also has an exocrine function: most of its cells secrete pancreatic juice through the pancreatic and accessory ducts to the lumen of the small intestine. Q: "endocrine" and "exocrine" are two types of what? Choices: - organs - fluids - cells - glands A:
Answer: glands
*Question*
Answer the following question given this paragraph: Cell division is how organisms grow and repair themselves. It is also how they produce offspring. Many single-celled organisms reproduce by binary fission. The parent cell simply divides to form two daughter cells that are identical to the parent. In many other organisms, two parents are involved, and the offspring are not identical to the parents. In fact, each offspring is unique. Look at the family in Figure below . The children resemble their parents, but they are not identical to them. Instead, each has a unique combination of characteristics inherited from both parents. In this lesson, you will learn how this happens. Q: What do organisms use to grow and repair themselves? Choices: - diffusion - mutation - cell solution - cell division A:
**Answer**
cell division
(Q).
Answer the following question given this paragraph: 3. Electrical energy is the energy of moving electrons. Electrons flow through wires to create electric current. Q: Electrons flow through wires to create what? Choices: - electromagnetism - hydroelectric power - balanced reaction - electric current A:
(A).
electric current