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? Choices: - RNA - DNA - vesicles - microfilaments A:
microfilaments

(Question)
Q: What is the chief organ 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? Choices: - helium - catalyst - fossil - hydrocarbon A:
Ans: hydrocarbon

(Q).
Q: What is occasional chest pain known as? 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. Choices: - weak tissue - neural tissue - resultant tissue - epithelial tissue A:

Ans:epithelial tissue

Q: Neon is an example of what kind of gas? Choices: - ideal - inert - natural - noble A:
noble