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General Biology Core Concepts

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  • What are the seven characteristics of life?

    Cells, energy use, growth/development, reproduction, response to stimuli, homeostasis, and evolution/adaptation.

  • What are the basic steps in the process of science?

    Observation → Question → Hypothesis → Experiment → Data → Conclusion.

  • What is a controlled experiment?

    An experiment where the variable being tested is changed while other conditions are controlled.

  • What is the independent variable?

    The variable that is changed by the researcher.

  • What is the dependent variable?

    The variable that is measured.

  • What is a scientific theory?

    A well-supported explanation based on evidence.

  • How does sample size affect data?

    Larger sample sizes generally make data more reliable.

  • What does statistically significant mean?

    The result is unlikely to be due to random chance.

  • What is spontaneous generation?

    The idea that living things could arise from nonliving material.

  • What is Germ Theory?

    The idea that microorganisms can cause disease.

  • Who was Louis Pasteur?

    A scientist whose work helped disprove spontaneous generation and establish Germ Theory.

  • What did Pasteur's experiment show?

    Microorganisms came from the environment rather than spontaneously appearing.

  • What is pasteurization?

    Using controlled heat to reduce microorganisms.

  • How did Pasteur's findings influence Lister?

    They supported the use of antiseptic practices during surgery.

  • What are the three subatomic particles?

    Protons, neutrons, and electrons.

  • What charge does a proton have?

    Positive (+).

  • What charge does a neutron have?

    Neutral (0).

  • What charge does an electron have?

    Negative (−).

  • What is the atomic number?

    The number of protons in an atom.

  • How do you calculate mass number?

    Protons + neutrons.

  • What is an isotope?

    Atoms of the same element with different numbers of neutrons.

  • What are valence electrons?

    Electrons in the outermost shell.

  • What is an ionic bond?

    A bond involving the transfer of electrons.

  • What is a covalent bond?

    A bond involving the sharing of electrons.

  • What is a hydrogen bond?

    A weak attraction involving hydrogen.

  • What does polar covalent mean?

    Electrons are shared unequally.

  • Why can water dissolve many substances?

    Water is polar, allowing it to interact with polar and charged substances.

  • What is an organic molecule?

    A molecule containing carbon.

  • What are the four macromolecules?

    Carbohydrates, lipids, proteins, and nucleic acids.

  • What are the building blocks of carbohydrates?

    Monosaccharides.

  • What are the building blocks of proteins?

    Amino acids.

  • What are the building blocks of nucleic acids?

    Nucleotides.

  • What is a polymer?

    A large molecule made from repeating smaller units called monomers.

  • What is a monosaccharide?

    A single sugar unit.

  • What is a polysaccharide?

    A molecule made of many sugar units.

  • What is a polypeptide?

    A chain of amino acids.

  • What are the three parts of a DNA nucleotide?

    Sugar, phosphate group, and nitrogenous base.

  • What holds the two DNA strands together?

    Hydrogen bonds.

  • What is the basic structure of an amino acid?

    A central carbon attached to an amino group, carboxyl group, hydrogen, and side group (R group).

  • What is the R group?

    The variable side group of an amino acid.

  • What is the primary structure of a protein?

    The sequence/order of amino acids.