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Practice Exam 2 Study Guidance: Cellular Energy, Photosynthesis, and Cell Division

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Q1. How do cells capture the energy released by cellular respiration?

Background

Topic: Cellular Respiration and Energy Capture

This question tests your understanding of how cells convert the energy stored in glucose into a usable form during cellular respiration.

Key Terms:

  • ATP (adenosine triphosphate): The main energy currency of the cell.

  • Cellular respiration: The process by which cells extract energy from glucose.

Step-by-Step Guidance

  1. Recall that cellular respiration is a series of metabolic pathways that break down glucose to release energy.

  2. Consider what molecule is produced as the direct energy carrier for most cellular processes.

  3. Think about whether cells store energy in glucose, carbon dioxide, or another molecule after respiration.

  4. Review the role of ATP in cellular metabolism and how it is generated during respiration.

Try solving on your own before revealing the answer!

Q2. The processes of photosynthesis and cellular respiration are complementary. During these energy conversions, some energy is

Background

Topic: Energy Flow in Biological Systems

This question examines your understanding of the relationship between photosynthesis and cellular respiration, and the fate of energy during these processes.

Key Terms:

  • Photosynthesis: The process by which plants convert light energy into chemical energy.

  • Cellular respiration: The process of breaking down glucose to release energy.

  • Heat: A form of energy often lost during energy conversions.

Step-by-Step Guidance

  1. Recall the law of conservation of energy and the concept of energy transformation inefficiency.

  2. Think about what happens to energy that is not captured in chemical bonds during these processes.

  3. Consider whether energy is destroyed, converted to light, or lost in another form.

  4. Review the role of heat in biological energy conversions.

Try solving on your own before revealing the answer!

Q3. A kilocalorie is defined as

Background

Topic: Units of Energy in Biology

This question tests your knowledge of the definition of a kilocalorie, a common unit of energy in biological systems.

Key Terms:

  • Kilocalorie (kcal): A unit of energy often used to measure food energy.

  • Heat: Energy transferred due to temperature difference.

Step-by-Step Guidance

  1. Recall the scientific definition of a calorie and how it relates to water and temperature.

  2. Remember that a kilocalorie is 1,000 calories.

  3. Consider which option correctly describes the amount of heat needed to raise the temperature of a specific mass of water by 1°C.

  4. Eliminate options that refer to food quantity or exercise rather than heat energy.

Try solving on your own before revealing the answer!

Q4. During cellular respiration, energy in glucose

Background

Topic: Cellular Respiration and Energy Transfer

This question focuses on how the energy stored in glucose is transferred during cellular respiration.

Key Terms:

  • Glucose: A simple sugar and primary energy source for cells.

  • Electrons: Subatomic particles involved in energy transfer.

Step-by-Step Guidance

  1. Recall the main steps of cellular respiration and how energy is extracted from glucose.

  2. Think about whether energy is released all at once or in a series of steps.

  3. Consider the role of electron carriers (like NADH and FADH2) in transferring energy.

  4. Review how electrons are used to generate ATP in the electron transport chain.

Try solving on your own before revealing the answer!

Q5. Oxidation is the ________, and reduction is the ________.

Background

Topic: Redox Reactions in Biology

This question tests your understanding of oxidation and reduction, which are key concepts in cellular respiration and photosynthesis.

Key Terms:

  • Oxidation: The loss of electrons from a molecule.

  • Reduction: The gain of electrons by a molecule.

Step-by-Step Guidance

  1. Recall the mnemonic "OIL RIG" (Oxidation Is Loss, Reduction Is Gain) of electrons.

  2. Match the definitions to the correct terms in the question.

  3. Be careful not to confuse the gain/loss of electrons with the gain/loss of oxygen or protons.

  4. Eliminate options that do not fit the standard definitions of oxidation and reduction.

Try solving on your own before revealing the answer!

Q6. Which statement regarding the movement of electrons during cellular respiration is true?

Background

Topic: Electron Transport in Cellular Respiration

This question examines your understanding of how electrons move and what happens to oxygen during cellular respiration.

Key Terms:

  • Electron transport chain: A series of proteins that transfer electrons to generate ATP.

  • Reduction of oxygen: Oxygen acts as the final electron acceptor and forms water.

Step-by-Step Guidance

  1. Recall the role of oxygen in the electron transport chain.

  2. Think about what happens to electrons as they are passed along the chain.

  3. Consider whether oxygen is oxidized or reduced at the end of the chain.

  4. Eliminate statements that contradict the known steps of cellular respiration.

Try solving on your own before revealing the answer!

Q7. As a result of glycolysis, there is a net gain of ________ ATP(s).

Background

Topic: Glycolysis and ATP Yield

This question tests your knowledge of the number of ATP molecules produced (net gain) during glycolysis.

Key Terms:

  • Glycolysis: The first step of cellular respiration, breaking down glucose into pyruvate.

  • ATP: The energy currency of the cell.

  • Net gain: The total produced minus the total used.

Step-by-Step Guidance

  1. Recall how many ATP molecules are produced and consumed during glycolysis.

  2. Subtract the number of ATP used from the number produced to find the net gain.

  3. Review the steps of glycolysis to confirm your calculation.

  4. Choose the answer that matches your calculation.

Try solving on your own before revealing the answer!

Q8. Photoautotrophs

Background

Topic: Types of Organisms and Energy Sources

This question tests your understanding of what photoautotrophs are and how they obtain energy and carbon.

Key Terms:

  • Photoautotroph: An organism that uses light energy to synthesize organic compounds from inorganic sources.

  • Organic vs. inorganic molecules: Organic molecules contain carbon-hydrogen bonds; inorganic do not.

Step-by-Step Guidance

  1. Recall the definition of "photoautotroph" and break down the word: "photo" (light), "auto" (self), "troph" (feeder).

  2. Consider whether photoautotrophs use organic or inorganic raw materials to make food.

  3. Eliminate options that do not fit the definition.

  4. Remember that green plants are not the only photoautotrophs.

Try solving on your own before revealing the answer!

Q9. The oxygen released into the air as a product of photosynthesis comes from

Background

Topic: Photosynthesis and Oxygen Production

This question tests your knowledge of the source of oxygen produced during photosynthesis.

Key Terms:

  • Photosynthesis: The process by which plants convert light energy into chemical energy.

  • Reactants and products: Substances consumed and produced in a chemical reaction.

Step-by-Step Guidance

  1. Recall the overall equation for photosynthesis:

  2. Identify which molecule provides the oxygen atoms found in the O2 released.

  3. Consider the light-dependent reactions and what is split to release oxygen.

  4. Eliminate options that do not fit the chemical equation.

Try solving on your own before revealing the answer!

Q10. Which molecule is a reactant of photosynthesis?

Background

Topic: Photosynthesis Reactants and Products

This question tests your ability to identify the molecules that are consumed (reactants) during photosynthesis.

Key Terms:

  • Reactant: A substance that is consumed in a chemical reaction.

  • Photosynthesis equation:

Step-by-Step Guidance

  1. Recall the overall equation for photosynthesis and identify the reactants.

  2. Determine which of the answer choices are on the left side of the equation (the reactant side).

  3. Eliminate products and substances not directly involved as reactants.

  4. Choose the correct molecule from the options provided.

Try solving on your own before revealing the answer!

Q11. What is the source of energy that provides the boost for electrons during photosynthesis?

Background

Topic: Light Reactions in Photosynthesis

This question tests your understanding of what energizes electrons in the process of photosynthesis.

Key Terms:

  • Photosystem: A complex that absorbs light and energizes electrons.

  • Photon: A packet of light energy.

Step-by-Step Guidance

  1. Recall what happens in the light-dependent reactions of photosynthesis.

  2. Think about what provides the energy to excite electrons in chlorophyll.

  3. Eliminate options that are products of photosynthesis or involved in later steps.

  4. Choose the answer that directly relates to the initial energy input.

Try solving on your own before revealing the answer!

Q12. Which statement comparing photosynthesis and cellular respiration is false?

Background

Topic: Comparing Photosynthesis and Cellular Respiration

This question tests your ability to distinguish between the processes of photosynthesis and cellular respiration.

Key Terms:

  • Photosynthesis: Consumes CO2 and produces O2.

  • Cellular respiration: Consumes O2 and produces CO2.

  • ATP: Produced in both processes, but in different contexts.

Step-by-Step Guidance

  1. Review the main products and reactants of both processes.

  2. Recall whether ATP is produced during photosynthesis and/or respiration.

  3. Identify which statement does not accurately describe the processes.

  4. Eliminate statements that are true for both processes.

Try solving on your own before revealing the answer!

Q13. Which color contributes the least energy to photosynthesis?

Background

Topic: Light Absorption in Photosynthesis

This question tests your understanding of the absorption spectrum of chlorophyll and which wavelengths are most/least effective for photosynthesis.

Key Terms:

  • Chlorophyll: The main pigment involved in photosynthesis.

  • Absorption spectrum: The range of light wavelengths absorbed by a pigment.

Step-by-Step Guidance

  1. Recall which colors of light are absorbed most efficiently by chlorophyll.

  2. Think about which color is reflected, making plants appear that color.

  3. Eliminate colors that are strongly absorbed and used in photosynthesis.

  4. Choose the color that is least absorbed and thus least useful for photosynthesis.

Try solving on your own before revealing the answer!

Q14. A packet of light energy is called a

Background

Topic: Properties of Light

This question tests your knowledge of the terminology used to describe light energy in physics and biology.

Key Terms:

  • Photon: The basic unit or packet of light energy.

  • Quantum: A general term for a discrete packet of energy.

Step-by-Step Guidance

  1. Recall the term used in biology and physics for a single packet of light energy.

  2. Eliminate terms that refer to pigments or are not standard scientific terms.

  3. Choose the answer that is most specific to light energy.

  4. Remember that "photon" is the term most commonly used in this context.

Try solving on your own before revealing the answer!

Q15. Which statement regarding sexual and asexual reproduction is true?

Background

Topic: Types of Reproduction

This question tests your understanding of the differences between sexual and asexual reproduction, especially regarding genetic variation.

Key Terms:

  • Sexual reproduction: Involves two parents and produces genetically variable offspring.

  • Asexual reproduction: Involves one parent and produces genetically identical offspring.

  • Genetic variation: Differences in DNA among individuals.

Step-by-Step Guidance

  1. Recall the main differences between sexual and asexual reproduction.

  2. Consider which process is more likely to increase genetic variation.

  3. Eliminate statements that are not true for both types of reproduction.

  4. Choose the statement that accurately describes the relationship between reproduction and genetic variation.

Try solving on your own before revealing the answer!

Q16. Which statement regarding cell division is false?

Background

Topic: Cell Division in Prokaryotes and Eukaryotes

This question tests your understanding of the roles and occurrence of cell division in different organisms.

Key Terms:

  • Cell division: The process by which cells reproduce.

  • Eukaryotes: Organisms with a nucleus.

  • Prokaryotes: Organisms without a nucleus (e.g., bacteria).

Step-by-Step Guidance

  1. Recall the functions of cell division in both prokaryotes and eukaryotes.

  2. Consider whether cell division is rare or common in prokaryotes.

  3. Eliminate statements that are true for all organisms.

  4. Identify the statement that does not accurately describe cell division.

Try solving on your own before revealing the answer!

Q17. Sister chromatids are

Background

Topic: Chromosome Structure

This question tests your understanding of what sister chromatids are and when they are present in the cell cycle.

Key Terms:

  • Sister chromatids: Identical copies of a chromosome joined at the centromere.

  • Centromere: The region where sister chromatids are attached.

Step-by-Step Guidance

  1. Recall when sister chromatids are formed during the cell cycle.

  2. Consider their structure and how they are connected.

  3. Eliminate options that do not fit the definition or timing of sister chromatids.

  4. Choose the answer that best describes sister chromatids.

Try solving on your own before revealing the answer!

Q18. Which event occurs during interphase?

Background

Topic: Cell Cycle Phases

This question tests your knowledge of what happens during interphase, the longest phase of the cell cycle.

Key Terms:

  • Interphase: The phase of the cell cycle where the cell grows and DNA is replicated.

  • Cytokinesis: Division of the cytoplasm, which occurs after mitosis.

Step-by-Step Guidance

  1. Recall the main events of interphase (G1, S, G2 phases).

  2. Consider which events are unique to interphase versus mitosis or cytokinesis.

  3. Eliminate options that occur during mitosis or after cell division.

  4. Choose the event that accurately describes interphase.

Try solving on your own before revealing the answer!

Q19. A benign tumor differs from a malignant tumor in that a benign tumor

Background

Topic: Cancer Biology

This question tests your understanding of the differences between benign and malignant tumors.

Key Terms:

  • Benign tumor: A non-cancerous growth that does not spread.

  • Malignant tumor: A cancerous growth that can invade other tissues (metastasize).

  • Metastasis: The spread of cancer cells to other parts of the body.

Step-by-Step Guidance

  1. Recall the definitions of benign and malignant tumors.

  2. Consider whether benign tumors spread or stay localized.

  3. Eliminate options that describe malignant tumors.

  4. Choose the statement that accurately describes a benign tumor.

Try solving on your own before revealing the answer!

Q20. Nondisjunction occurs when

Background

Topic: Chromosome Behavior During Meiosis

This question tests your understanding of errors in chromosome separation during meiosis.

Key Terms:

  • Nondisjunction: Failure of chromosome pairs to separate properly during meiosis.

  • Meiosis I: The first division in meiosis, where homologous chromosomes separate.

Step-by-Step Guidance

  1. Recall what happens during normal chromosome separation in meiosis.

  2. Consider what could go wrong to cause an abnormal number of chromosomes in gametes.

  3. Eliminate options that describe other types of chromosomal mutations.

  4. Choose the statement that best describes nondisjunction.

Try solving on your own before revealing the answer!

Q21. Which statement regarding mitosis and meiosis is true?

Background

Topic: Mitosis vs. Meiosis

This question tests your understanding of the similarities and differences between mitosis and meiosis, especially regarding chromosome behavior.

Key Terms:

  • Mitosis: Cell division that produces identical daughter cells.

  • Meiosis: Cell division that produces gametes with half the chromosome number.

  • Anaphase: The stage where chromatids or chromosomes separate.

Step-by-Step Guidance

  1. Recall what happens to sister chromatids during anaphase of mitosis and anaphase II of meiosis.

  2. Consider the differences between metaphase of mitosis and metaphase I of meiosis.

  3. Eliminate statements that incorrectly describe the stages or processes.

  4. Choose the statement that accurately reflects the events in both mitosis and meiosis.

Try solving on your own before revealing the answer!

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