(Question)
Q: Hundreds of organelles called myofibrils, made up of two types of protein filaments, are contained in each fiber of what? Read this paragraph and choose the correct option from the provided answers: Each muscle fiber contains hundreds of organelles called myofibrils . Each myofibril is made up of two types of protein filaments: actin filaments, which are thinner, and myosin filaments, which are thicker. Actin filaments are anchored to structures called Z lines (see Figure below ). The region between two Z lines is called a sarcomere . Within a sarcomere, myosin filaments overlap the actin filaments. The myosin filaments have tiny structures called cross bridges that can attach to actin filaments. Choices: - bone - hair - cartilage - muscle A:
(Answer)
muscle

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Q: What does the geiger counter detect? Read this paragraph and choose the correct option from the provided answers: You generally can't see, smell, taste, hear, or feel radiation. Fortunately, there are devices such as Geiger counters that can detect radiation. A Geiger counter, like the one pictured in the Figure below , contains atoms of a gas that is ionized if it encounters radiation. When this happens, the gas atoms change to ions that can carry an electric current. The current causes the Geiger counter to click. The faster the clicks occur, the higher the level of radiation. You can see a video about the Geiger counter and how it was invented at the URL below. Choices: - vibration - convection - moisture - radiation A:
(Answer)
radiation

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Q: What does the gizzard in birds contain that allows them to grind food? Read this paragraph and choose the correct option from the provided answers: The digestive system of birds is unique, with a gizzard that contains swallowed stones for grinding food. Birds do not have teeth. What do you think the stones do? They help them digest their food. Defining characteristics of modern birds also include:. Choices: - acid - bile - teeth - swallowed stones A:
(Answer)
swallowed stones