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General Biology: Nucleic Acids, Carbohydrates, Lipids, and Cell Structure

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  • What are nucleic acids and their primary function?

    Nucleic acids are biomolecules (DNA and RNA) that store and transmit genetic information essential for cell function and heredity.

  • What is the RNA World hypothesis?

    The RNA World hypothesis suggests that early life used RNA both to store genetic information and to catalyze chemical reactions before DNA and proteins evolved.

  • What are the basic building blocks of nucleic acids?

    Nucleotides are the building blocks, each composed of a sugar, a phosphate group, and a nitrogenous base.

  • Name the four nitrogenous bases found in DNA.

    Adenine (A), Thymine (T), Cytosine (C), and Guanine (G) are the four bases in DNA.

  • What sugar is found in RNA nucleotides?

    Ribose is the sugar in RNA nucleotides, differing from DNA's deoxyribose by having one more oxygen atom.

  • What are carbohydrates and their main roles?

    Carbohydrates are organic molecules that provide energy, structural support, and serve as recognition molecules in cells.

  • What is the general formula for carbohydrates?

    Carbohydrates generally follow the formula \((CH_2O)_n\), where n is the number of carbon atoms.

  • Differentiate between monosaccharides, disaccharides, and polysaccharides.

    Monosaccharides are single sugar units, disaccharides are two monosaccharides linked, and polysaccharides are long chains of monosaccharides.

  • What is the role of lipids in cells?

    Lipids store energy, form cell membranes, and act as signaling molecules.

  • Name the main types of lipids relevant to cell membranes.

    Phospholipids, cholesterol, and glycolipids are key lipids in membranes.

  • Describe the structure of a phospholipid.

    A phospholipid has a hydrophilic phosphate head and two hydrophobic fatty acid tails, forming bilayers in membranes.

  • What is the significance of the lipid bilayer in cells?

    The lipid bilayer forms a semi-permeable membrane that controls substance entry and exit in cells.

  • What are the first cells believed to have been like?

    Early cells likely had simple membranes made of lipids and contained RNA for genetic information and catalysis.

  • What are the main components inside a typical cell?

    Cells contain a plasma membrane, cytoplasm, nucleic acids, proteins, and various organelles depending on cell type.

  • What is the function of the cell membrane?

    The cell membrane protects the cell, maintains homeostasis, and mediates communication and transport.

  • How do carbohydrates contribute to cell recognition?

    Carbohydrates on the cell surface act as recognition molecules for cell-cell communication and immune responses.

  • What distinguishes RNA from DNA structurally?

    RNA has ribose sugar and uracil instead of thymine, and is usually single-stranded, unlike DNA.

  • Why are lipids insoluble in water?

    Lipids are hydrophobic due to their long hydrocarbon chains, making them insoluble in water.

  • What role do carbohydrates play in energy storage?

    Polysaccharides like starch and glycogen store energy in plants and animals, respectively.

  • What is the significance of the RNA catalytic activity?

    RNA can act as a ribozymes, catalyzing chemical reactions, supporting the RNA World hypothesis.