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Questions and Answers
Microtubules are composed of the protein actin.
False
Intermediate filaments provide mechanical strength and resistance to shear stress.
True
Microfilaments are also known as tubulin filaments.
False
Microtubules are involved in determining the positions of membrane-enclosed organelles.
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Keratins are found in muscle cells.
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Microfilaments are responsible for muscle contraction.
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Lamin proteins provide structural support to the nuclear envelope.
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Intermediate filaments are thinner than microtubules.
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Cilia and flagella are made of microfilaments.
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Microtubules are not involved in separating chromosomes during cell division.
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What is the main function of water in the body?
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Which of the following is NOT a function of water in the body?
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What is the role of electrolytes in the body?
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Which part of the body does water help to moisten?
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Why are significant fatty quantities stored in the liver and adipose tissue?
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What percentage of total cell mass does water account for in most cases?
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Which bodily fluids are formed by water?
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Why is water considered the most abundant molecule in cells and on Earth?
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Which type of protein is responsible for protecting against foreign substances and disease-causing organisms?
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What is the main function of nucleic acids in cells?
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Which type of sugar is found in RNA but not in DNA?
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What type of bond holds together the sugar and phosphate molecules in the backbone of a nucleic acid?
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Which molecule serves as a biological catalyst in cells?
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What is the main function of structural proteins like collagen?
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Which nucleotide base is found in RNA but not in DNA?
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What is the role of membrane receptor proteins in cells?
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What is the structural difference between DNA and RNA?
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