Given a scientific passage and an answer, generate a question for the given answer.
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Question: Passage: Figure 6.11 The frictional force supplies the centripetal force and is numerically equal to it. Centripetal force is perpendicular to velocity and causes uniform circular motion. The larger the F c , the smaller the radius of curvature r and the sharper the curve. The second curve has the same v , but a larger. Answer: centripetal force

Answer: What force is perpendicular to velocity and causes uniform circular motion?

Question: Passage: Bacteria lack many of the structures that eukaryotic cells contain. For example, they don't have a nucleus. They also lack membrane-bound organelles, such as mitochondria or chloroplasts. The DNA of a bacterial cell is also different from a eukaryotic cell. Bacterial DNA is contained in one circular chromosome, located in the cytoplasm. Eukaryotes have several linear chromosomes. Bacteria also have two additional unique features: a cell wall and flagella. Some bacteria also have a capsule outside the cell wall. Answer: one circular chromosome

Answer: How many chromosomes do bacterial dna have?

Question: Passage: Cleavage is the tendency of a mineral to break along certain planes. When a mineral breaks along a plane it makes a smooth surface. Minerals with different crystal structures will break or cleave in different ways, as in Figure below . Halite tends to form cubes with smooth surfaces. Mica tends to form sheets. Fluorite can form octahedrons. Answer: cleavage

Answer:
What term means the tendency of a mineral to break along certain planes?