Q1. What is the difference between matter and energy? Give examples of each.

Background

Topic: Basic Chemistry in Biology

This question tests your understanding of fundamental concepts in biology—specifically, the distinction between matter (which makes up physical substances) and energy (which drives biological processes).

Key Terms:

• Matter: Anything that has mass and takes up space.

• Energy: The ability to do work or cause change; exists in various forms (kinetic, potential, chemical, etc.).

Step-by-Step Guidance

1. Define matter and energy in your own words, focusing on their physical and functional differences.

2. Think of examples of matter (e.g., water, cells, air) and energy (e.g., sunlight, heat, ATP).

3. Consider how these concepts are relevant in biological systems (e.g., plants use sunlight energy to convert matter—CO2 and H2O—into glucose).

Try solving on your own before revealing the answer!

Q2. List the three subatomic particles. List their charges and locations.

Background

Topic: Atomic Structure

This question tests your knowledge of the basic building blocks of atoms, which are fundamental to understanding molecules and chemical reactions in biology.

Key Terms:

• Proton: Positive charge, located in the nucleus.

• Neutron: No charge (neutral), located in the nucleus.

• Electron: Negative charge, located in orbitals around the nucleus.

Step-by-Step Guidance

1. Recall the three main subatomic particles found in atoms.

2. Identify the charge associated with each particle.

3. Describe where each particle is located within the atom (nucleus or electron cloud).

Try solving on your own before revealing the answer!

Q3. Identify the atomic number and mass number of an atom. How can you determine the number of each subatomic particle?

Background

Topic: Atomic Structure and Isotopes

This question tests your ability to interpret atomic numbers and mass numbers, which are essential for understanding elements and isotopes in biology.

Key Terms and Formulas:

• Atomic Number (Z): Number of protons in the nucleus.

• Mass Number (A): Number of protons plus neutrons.

• Number of Neutrons:

Step-by-Step Guidance

1. Find the atomic number (usually listed on the periodic table) to determine the number of protons.

2. Find the mass number (sum of protons and neutrons).

3. Calculate the number of neutrons by subtracting the atomic number from the mass number.

4. Remember that the number of electrons equals the number of protons in a neutral atom.

Try solving on your own before revealing the answer!

Q4. Distinguish between covalent, ionic, and hydrogen bonds. Which atoms are involved in the H, C, N, and O bonds?

Background

Topic: Chemical Bonds in Biology

This question tests your understanding of the types of chemical bonds that hold atoms together in biological molecules, and which atoms commonly participate in these bonds.

Key Terms:

• Covalent Bond: Sharing of electrons between atoms (e.g., H2O, CH4).

• Ionic Bond: Transfer of electrons from one atom to another (e.g., NaCl).

• Hydrogen Bond: Weak attraction between a hydrogen atom and an electronegative atom (e.g., O or N).

Step-by-Step Guidance

1. Define each type of bond and describe how electrons are involved.

2. Identify which atoms (H, C, N, O) commonly form each type of bond in biological molecules.

3. Consider examples of molecules where these bonds are present (e.g., water, methane, DNA).

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Q5. Define isotope. How do isotopes of an element differ?

Background

Topic: Isotopes and Atomic Structure

This question tests your understanding of isotopes, which are important in biology for processes like radiometric dating and medical imaging.

Key Terms:

• Isotope: Atoms of the same element with different numbers of neutrons.

Step-by-Step Guidance

1. Define what an isotope is in terms of atomic structure.

2. Explain how isotopes of the same element have the same number of protons but different numbers of neutrons.

3. Consider how this affects the mass number and properties of the element.

Try solving on your own before revealing the answer!

Q6. Change the number of electrons: what does it create?

Background

Topic: Ions and Atomic Structure

This question tests your understanding of how changing the number of electrons affects the charge and identity of an atom.

Key Terms:

• Ion: An atom or molecule with a net electric charge due to loss or gain of electrons.

Step-by-Step Guidance

1. Recall that electrons are negatively charged.

2. Consider what happens when an atom gains or loses electrons.

3. Determine the resulting charge and the term used for such atoms.

Try solving on your own before revealing the answer!

Q7. Change the number of neutrons: what does it create?

Background

Topic: Isotopes

This question tests your understanding of how changing the number of neutrons affects the identity of an atom.

Key Terms:

• Isotope: Atoms of the same element with different numbers of neutrons.

Step-by-Step Guidance

1. Recall that neutrons are neutral particles in the nucleus.

2. Consider what happens when the number of neutrons changes in an atom.

3. Determine the term used for atoms with different numbers of neutrons.

Try solving on your own before revealing the answer!

Q8. Change the number of protons: what does it create?

Background

Topic: Atomic Structure and Elements

This question tests your understanding of how changing the number of protons affects the identity of an atom.

Key Terms:

• Element: Defined by the number of protons in its atoms.

Step-by-Step Guidance

1. Recall that the atomic number is the number of protons.

2. Consider what happens when the number of protons changes in an atom.

3. Determine the term used for atoms with different numbers of protons.

Try solving on your own before revealing the answer!

Q9. What is a molecule? What is a compound?

Background

Topic: Chemical Structure

This question tests your understanding of basic chemical terminology used in biology.

Key Terms:

• Molecule: Two or more atoms bonded together.

• Compound: A molecule made of atoms from different elements.

Step-by-Step Guidance

1. Define molecule and compound.

2. Distinguish between molecules made of the same element and compounds made of different elements.

3. Provide examples of each (e.g., O2 vs. H2O).

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Q10. What is a chemical reaction?

Background

Topic: Chemical Reactions in Biology

This question tests your understanding of how substances change in biology through chemical reactions.

Key Terms:

• Chemical Reaction: Process in which substances (reactants) are transformed into new substances (products).

Step-by-Step Guidance

1. Define what a chemical reaction is.

2. Describe the process of breaking and forming chemical bonds.

3. Consider examples relevant to biology (e.g., photosynthesis, cellular respiration).

Try solving on your own before revealing the answer!