Answer the following question given this paragraph: Mutations have many possible causes. Some mutations occur when a mistake is made during DNA replication or transcription. Other mutations occur because of environmental factors. Anything in the environment that causes a mutation is known as a mutagen . Examples of mutagens are shown in Figure below . They include ultraviolet rays in sunlight, chemicals in cigarette smoke, and certain viruses and bacteria. Q: What is it called when a mistake occurs in dna replication. Choices: - adaptation - degradation - radiation - mutation A:
mutation
(Question)
Answer the following question given this paragraph: The Salivary Glands Many small salivary glands are housed within the mucous membranes of the mouth and tongue. These minor exocrine glands are constantly secreting saliva, either directly into the oral cavity or indirectly through ducts, even while you sleep. In fact, an average of 1 to 1.5 liters of saliva is secreted each day. Usually just enough saliva is present to moisten the mouth and teeth. Secretion increases when you eat, because saliva is essential to moisten food and initiate the chemical breakdown of carbohydrates. Small amounts of saliva are also secreted by the labial glands in the lips. In addition, the buccal glands in the cheeks, palatal glands in the palate, and lingual glands in the tongue help ensure that all areas of the mouth are supplied with adequate saliva. Q: What small glands are abundant within the mucous membranes of the mouth and tongue? Choices: - hypothalamus glands - retinal glands - localized glands - salivary glands A:
(Answer)
salivary glands
Ques: Answer the following question given this paragraph: The pancreas is located near the stomach. Its hormones include insulin and glucagon. These two hormones work together to control the level of glucose in the blood. Insulin causes excess blood glucose to be taken up by the liver, which stores the glucose as glycogen. Glucagon stimulates the liver to break down glycogen into glucose and release it back into the blood. The pancreas also secretes digestive enzymes into the digestive tract. Q: Which hormones work together to control the level of glucose in the blood? Choices: - insulin and estrogen - serotonin and glucagon - testosterone and insulin - insulin and glucagon A:
Ans: insulin and glucagon
(Q).
Answer the following question given this paragraph: All electric circuits have at least two parts: a voltage source and a conductor. They may have other parts as well, such as light bulbs and switches, as in the simple circuit seen in the Figure below . To see an animation of a circuit like this one, go to: http://www. rkm. com. au/animations/animation-electrical-circuit. html. Q: A voltage source and a conductor are common to all what? Choices: - magnets - thermometers - cooling circuits - electric circuits A:
(A).
electric circuits
Ques:Answer the following question given this paragraph: Chemical sedimentary rocks form when crystals precipitate out from a liquid. The mineral halite, also called rock salt, forms this way. You can make halite! Leave a shallow dish of salt water out in the Sun. As the water evaporates, salt crystals form in the dish. There are other chemical sedimentary rocks, like gypsum. Q: What forms when crystals precipitate out from a liquid? Choices: - liquid sedimentary rocks - plasma sedimentary rocks - plants sedimentary rocks - chemical sedimentary rocks A:

Ans:chemical sedimentary rocks
Question: Answer the following question given this paragraph: The amniotic sac is a membrane that surrounds the fetus. It is filled with water and dissolved substances, known as amniotic fluid. Imagine placing a small plastic toy inside a balloon and then filling the balloon with water. The toy would be cushioned and protected by the water. It would also be able to move freely inside the balloon. The amniotic sac and its fluid are like a water-filled balloon. They cushion and protect the fetus. They also let the fetus move freely inside the uterus. Q: What is the membrane that surrounds a fetus called? Choices: - cell membrane - umbilicus - umbilical sac - amniotic sac A:
Answer:
amniotic sac