Q: Q: What 'counting' instrument is used to measure radioactivity? Read this paragraph and choose the correct option from the provided answers: prepared. A student measures the radioactivity of this source with a Geiger counter and observes 1500 counts per minute. She notices that the source was prepared 120 days before her lab. What fraction of the decays is she observing with her apparatus? (b) Identify some of the reasons that only a fraction of the s emitted are observed by the detector. Armor-piercing shells with depleted uranium cores are fired by aircraft at tanks. (The high density of the uranium makes them effective. ) The uranium is called depleted because it has had its 235 U removed for reactor use and is. Choices: - Liquid Counter - ellie counter - pryor counter - geiger counter A:
A: geiger counter

Q: Q: Fruit comes from the ovaries of what types of plants? Read this paragraph and choose the correct option from the provided answers: Although flowers and their components are the major innovations of angiosperms, they are not the only ones. Angiosperms also have more efficient vascular tissues. Additionally, in many flowering plants the ovaries ripen into fruits. Fruits are often brightly colored, so animals are likely to see and eat them and disperse their seeds (see Figure below ). Choices: - deciduous - perennial - sprouting - flowering A:
A: flowering

Q: Q: What type of lipids contain the element phosphorus, carbon, hydrogen and oxygen? Read this paragraph and choose the correct option from the provided answers: Some lipids contain the element phosphorus as well as carbon, hydrogen, and oxygen. These lipids are called phospholipids. Two layers of phospholipid molecules make up the cell membranes of living things. In the Figure below , you can see how phospholipid molecules are arranged in a cell membrane. Choices: - filaments - eukaryotes - alleles - phospholipids A:
A: phospholipids

Q: Q: What involuntary muscle is found only in the heart? Read this paragraph and choose the correct option from the provided answers: Cardiac muscle is also an involuntary muscle, found only in the heart. The cardiac muscle fibers all contract together, generating enough force to push blood throughout the body. What would happen if this muscle was under conscious or voluntary control?. Choices: - physiological muscle - respiratory muscle - digestive muscle - cardiac muscle A:
A: cardiac muscle