Ques:Answer the following question given this paragraph: The sun and other stars produce light because they are so hot. They glow with light due to their extremely high temperatures. This way of producing light is called incandescence . Some objects produce light without becoming very hot. They generate light through chemical reactions or other processes. Producing light without heat is called luminescence . Objects that produce light by luminescence are said to be luminous. Luminescence, in turn, can occur in different ways:. Q: Producing light without heat is called what? Choices: - osmosis - thermoluminescence - bioluminescence - luminescence A:

Ans:luminescence
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Ques:Answer the following question given this paragraph: Under the direction of osteocytes, osteoblasts continuously build up bone, while osteoclasts continuously break down bone to maintain mineral homeostasis. Bone tissues include compact bone, spongy bone, bone marrow, and periosteum. Q: Osteoclasts break down bone to maintain mineral what? Choices: - density - fluctuations - polarity - homeostatis A:

Ans:homeostatis
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Ques:Answer the following question given this paragraph: 9.2 | Fibrous Joints By the end of this section, you will be able to: Describe the structural features of fibrous joints Distinguish between a suture, syndesmosis, and gomphosis Give an example of each type of fibrous joint At a fibrous joint, the adjacent bones are directly connected to each other by fibrous connective tissue, and thus the bones do not have a joint cavity between them (Figure 9.5). The gap between the bones may be narrow or wide. There are three types of fibrous joints. A suture is the narrow fibrous joint found between most bones of the skull. At a syndesmosis joint, the bones are more widely separated but are held together by a narrow band of fibrous connective tissue called a ligament or a wide sheet of connective tissue called an interosseous membrane. This type of fibrous joint is found between the shaft regions of the long bones in the forearm and in the leg. Lastly, a gomphosis is the narrow fibrous joint between the roots of a tooth and the bony socket in the jaw into which the tooth fits. Q: What type of fibrous joint is found between most bones of the skull? Choices: - lobiture - aperture - trecature - suture A:

Ans:suture
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Ques:Answer the following question given this paragraph: An enzyme is a protein that acts as a biological catalyst. Recall that a catalyst is a substance that increases the rate of a chemical reaction without itself being consumed in the reaction. Cellular processes consist of many chemical reactions that must occur quickly in order for the cell to function properly. Enzymes catalyze most of the chemical reactions that occur in a cell. A substrate is the molecule or molecules on which the enzyme acts. In the urease catalyzed reaction above, urea is the substrate. The Figure below diagrams a typical enzymatic reaction. Q: What term is used to describe a protein that acts as a biological catalyst? Choices: - nucleus - protein - heterozygote - enzyme A:

Ans:
enzyme
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