Biology Quiz
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Questions and Answers

What is the main difference between a theory and a hypothesis?

  • A theory is a guess, while a hypothesis is a tested idea
  • A hypothesis cannot be tested, while a theory can
  • A hypothesis is broader and more comprehensive than a theory
  • A theory is a well-tested and widely accepted explanation, while a hypothesis is a testable prediction (correct)

    • What are the three main subatomic particles of an atom?

  • Neutrons, neutrinos, electrons
  • Protons, neutrons, electrons (correct)
  • Protons, neutrons, photons
  • Protons, quarks, electrons

    • What happens when the number of protons in an atom changes?

  • The atom changes to a different element (correct)
  • The atom becomes an ion
  • The atom becomes radioactive
  • The atom becomes an isotope

    • What happens when the number of neutrons in an atom changes?

    <p>The atom becomes an isotope</p> Signup and view all the answers

    What does the atomic number of an element represent?

    <p>The number of protons in the nucleus</p> Signup and view all the answers

    What is the basis for ionic interactions?

    <p>Attraction between oppositely charged ions</p> Signup and view all the answers

    What is the basis for covalent interactions?

    <p>Sharing of electrons</p> Signup and view all the answers

    Which of the following is an example of an ionic bond?

    <p>NaCl</p> Signup and view all the answers

    What is a characteristic that is NOT shared by all living organisms?

    <p>Inability to reproduce</p> Signup and view all the answers

    What is the primary function of homeostasis?

    <p>To maintain a stable internal environment</p> Signup and view all the answers

    Which of the following is a characteristic of prokaryotes?

    <p>Presence of ribosomes</p> Signup and view all the answers

    What is a common feature of both prokaryotes and eukaryotes?

    <p>Presence of ribosomes</p> Signup and view all the answers

    What is the first step in the scientific method?

    <p>Making an observation</p> Signup and view all the answers

    What follows after forming a hypothesis in the scientific method?

    <p>Conducting an experiment</p> Signup and view all the answers

    What is a distinguishing feature of viruses?

    <p>They lack cellular structure</p> Signup and view all the answers

    What is a hypothesis?

    <p>A tentative explanation that can be tested by experiments or observations</p> Signup and view all the answers

    Study Notes

    Attributes of Living Organisms

    • Growth and development, response to stimuli, and metabolism are attributes of living organisms.
    • Reproduction is also an attribute of living organisms, which means that the inability to reproduce is not an attribute.

    Homeostasis

    • Homeostasis is the ability to maintain a stable internal environment.

    Prokaryotes and Eukaryotes

    Prokaryotes

    • Prokaryotes are a type of cell, and E. coli is an example of a prokaryote.
    • Prokaryotes do not have a nucleus.

    Eukaryotes

    • Eukaryotes are a type of cell, and humans, oak trees, and mushrooms are examples of eukaryotes.
    • Eukaryotes have a nucleus and mitochondria.
    • Both prokaryotes and eukaryotes have ribosomes.

    Evolutionary Timeline

    • Prokaryotes first appeared approximately 3.5 billion years ago in the evolutionary timeline.

    Viruses

    • Viruses lack cellular structure, which sets them apart from prokaryotes and eukaryotes.

    Scientific Method

    Steps

    • The steps of the scientific method are: making an observation, forming a hypothesis, conducting an experiment, and drawing a conclusion.

    Hypothesis versus Theory

    Hypothesis

    • A hypothesis is a tentative explanation that can be tested by experiments or observations.

    Theory

    • A theory is a well-tested and widely accepted explanation of some aspect of the natural world.
    • A theory differs from a hypothesis in that it is more comprehensive and widely accepted.

    Atomic Structure

    Subatomic Particles

    • The three main subatomic particles of an atom are protons, neutrons, and electrons.

    Atomic Number

    • The atomic number of an element represents the number of protons in the nucleus.

    Atomic Mass

    • The atomic mass of an element represents the average mass of all isotopes of the element.

    Isotopes

    • If the number of neutrons in an atom changes, the atom becomes an isotope.

    Ions

    • If the number of electrons in an atom changes, the atom becomes an ion.

    Molecules and Types of Bonds

    Ionic Interactions

    • Ionic interactions are based on the attraction between oppositely charged ions.
    • NaCl is an example of an ionic bond.

    Covalent Interactions

    • Covalent interactions are based on the sharing of electrons.
    • The two main types of covalent bonds are polar and nonpolar.

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    Quiz Team

    Description

    This quiz covers fundamental concepts in biology, including characteristics of living organisms, homeostasis, and the differences between prokaryotes and eukaryotes.

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