Q: What structures formed of twisted actin chains are found in almost every cell, and are numerous in muscle cells and cells that move by changing shape? Read this paragraph and choose the correct option from the provided answers: Microfilaments , shown in Figure below (b) , are made of two thin actin chains that are twisted around one another. Microfilaments are mostly concentrated just beneath the cell membrane, where they support the cell and help the cell keep its shape. Microfilaments form cytoplasmatic extensions, such as pseudopodia and microvilli, which allow certain cells to move. The actin of the microfilaments interacts with the protein myosin to cause contraction in muscle cells. Microfilaments are found in almost every cell, and are numerous in muscle cells and in cells that move by changing shape, such as phagocytes (white blood cells that search the body for bacteria and other invaders). Choices: - RNA - DNA - vesicles - microfilaments A:
microfilaments

(Question)
Q: What is the chief organ of the urinary system? Read this paragraph and choose the correct option from the provided answers: The kidneys are the chief organs of the urinary system. Choices: - liver - bladder - lung - kidney A:
(Answer)
kidney

Ques: Q: The fuel that burns in a combustion reaction in many fossil fuels such as natural gas that consists of carbon hydrogen is known as what? Read this paragraph and choose the correct option from the provided answers: The fuel that burns in a combustion reaction is often a substance called a hydrocarbon. A hydrocarbon is a compound that contains only carbon (C) and hydrogen (H). Fossil fuels, such as natural gas, consist of hydrocarbons. Natural gas is a fuel that is commonly used in home furnaces and gas stoves (see Figure below ). The main component of natural gas is the hydrocarbon called methane (CH 4 ). The combustion of methane is represented by the equation:. Choices: - helium - catalyst - fossil - hydrocarbon A:
Ans: hydrocarbon

(Q).
Q: What is occasional chest pain known as? Read this paragraph and choose the correct option from the provided answers: Choices: - cardiac arrest - arrhythmia - heart murmur - angina pectoris A:
(A).
angina pectoris

Ques:Q: Tissue is made up of layers of tightly packed cells that line the surfaces of the body, such as skin. Read this paragraph and choose the correct option from the provided answers: Epithelial tissue is made up of layers of tightly packed cells that line the surfaces of the body. Examples of epithelial tissue include the skin, the lining of the mouth and nose, and the lining of the digestive system. Choices: - weak tissue - neural tissue - resultant tissue - epithelial tissue A:

Ans:epithelial tissue

Q: Neon is an example of what kind of gas? Read this paragraph and choose the correct option from the provided answers: Once we reach neon, a noble gas, all of the 2p orbitals will be completely full. Neon has a configuration of 1s 2 2s 2 2p 6 . Any further electrons will need to go in the next highest energy orbital, which would be the 3s orbital. Choices: - ideal - inert - natural - noble A:
noble