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General Biology: Key Concepts of Life and Cells

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  • What is biology?

    Biology is the scientific study of life and living organisms, focusing on their structure, function, growth, origin, evolution, and distribution.

  • What are the key properties of life?

    Life is membrane delimited, composed of cells, stores genetic information, uses energy, self-replicates, responds to environment, and evolves.

  • What is the cellular basis of life?

    All living organisms are made of cells, the smallest units exhibiting all life properties, even if some cells lack certain features.

  • How is genetic information stored and transmitted?

    Genetic information is stored in DNA and transmitted via various forms of RNA like mRNA, tRNA, and rRNA.

  • How do living organisms acquire and use energy?

    Organisms obtain energy from sunlight (photosynthesis) or organic compounds (cellular respiration) and store it as ATP.

  • What is self-replication in living organisms?

    Self-replication is the ability of living things to reproduce by replicating genetic material and dividing cells to continue their species.

  • What role do membranes play in cells?

    Cell membranes, made mainly of lipids, provide a selectively permeable barrier, compartmentalize functions, and maintain homeostasis.

  • How do living organisms respond to their environment?

    Organisms sense and respond to environmental changes using proteins that act as enzymes, receptors, and structural components.

  • What is evolution in biological terms?

    Evolution is the change in populations over generations through variations in heritable traits, allowing adaptation to environments.

  • What are the four major classes of biomolecules essential for life?

    Lipids, Carbohydrates, Nucleic Acids, and Proteins are the main biomolecules supporting life.

  • What are the primary functions of lipids?

    Lipids form membranes, store energy, and provide insulation.

  • What roles do carbohydrates play in living organisms?

    Carbohydrates provide energy.

  • What is the function of nucleic acids?

    Nucleic acids store and transmit genetic information.

  • What are the main functions of proteins?

    Proteins catalyze reactions, provide structure, and regulate biological processes.

  • What distinguishes prokaryotic and eukaryotic cells?

    Eukaryotic cells have a nucleus; prokaryotic cells do not.

  • Are viruses considered alive?

    Viruses can store information, evolve, and respond to environments but lack metabolism and independent replication, so their status as alive is debated.

  • What is the scientific method?

    The scientific method involves observation, hypothesis generation, prediction, experimentation with controls, and revising hypotheses based on results.

  • What is the purpose of a control group in experiments?

    A control group allows comparison by lacking the independent variable, helping determine the effect of the variable in experimental groups.