Ques:Q: Minerals form when they precipitate from hot fluids that have done what? Read this paragraph and choose the correct option from the provided answers: Minerals form when they precipitate from hot fluids that have cooled down. Choices: - heated up - dried out - accelerated down - cooled down A:

Ans:cooled down
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Ques:Q: What two states of matter are included in the category "fluids"? Read this paragraph and choose the correct option from the provided answers: Fluid friction is friction that acts on objects that are moving through a fluid. A fluid is a substance that can flow and take the shape of its container. Fluids include liquids and gases. If you've ever tried to push your open hand through the water in a tub or pool, then you've experienced fluid friction between your hand and the water. When a skydiver is falling toward Earth with a parachute, fluid friction between the parachute and the air slows the descent (see Figure below ). Fluid pressure with the air is called air resistance. The faster or larger a moving object is, the greater is the fluid friction resisting its motion. The very large surface area of a parachute, for example, has greater air resistance than a skydiver's body. Choices: - solids and gases - bacteria and gases - liquids and soilds - liquids and gases A:

Ans:liquids and gases
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Ques:Q: What structure shows the bonding between atoms, with dots representing available electrons? Read this paragraph and choose the correct option from the provided answers: Draw the Lewis electron dot diagram for each substance. Double or triple bonds may be needed. Choices: - Mendelian model - Pascal model - string theory - lewis structure A:

Ans:lewis structure
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Ques:Q: What is the smallest contractile portion of a muscle? Read this paragraph and choose the correct option from the provided answers: 10.3 Muscle Fiber Contraction and Relaxation A sarcomere is the smallest contractile portion of a muscle. Myofibrils are composed of thick and thin filaments. Thick filaments are composed of the protein myosin; thin filaments are composed of the protein actin. Troponin and tropomyosin are regulatory proteins. Muscle contraction is described by the sliding filament model of contraction. ACh is the neurotransmitter that binds at the neuromuscular junction (NMJ) to trigger depolarization, and an action potential travels along the sarcolemma to trigger calcium release from SR. The actin sites are exposed after Ca++ enters the sarcoplasm from its SR storage to activate the troponin-tropomyosin complex so that the tropomyosin shifts away from the sites. The cross-bridging of myposin heads docking into actin-binding sites is followed by the "power stroke"the sliding of the thin filaments by thick filaments. The power strokes are powered by ATP. Ultimately, the sarcomeres, myofibrils, and muscle fibers shorten to produce movement. Choices: - filaments - cell - capillary - sarcomere A:

Ans:
sarcomere
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