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Questions and Answers
Which of the following best describes the primary role of macronutrients in a living organism?
Which of the following best describes the primary role of macronutrients in a living organism?
A scientist is studying a new organism and finds it requires a large intake of a particular nutrient. Based on this information, which category does this nutrient most likely belong to?
A scientist is studying a new organism and finds it requires a large intake of a particular nutrient. Based on this information, which category does this nutrient most likely belong to?
A deficiency in which micromineral would most directly impair the blood's ability to transport oxygen?
A deficiency in which micromineral would most directly impair the blood's ability to transport oxygen?
Which of the following pairs of macrominerals are most critical for the transmission of nerve signals?
Which of the following pairs of macrominerals are most critical for the transmission of nerve signals?
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Considering the definition of nutrients, which role do biomolecules, such as proteins, carbohydrates, and lipids, NOT fulfill?
Considering the definition of nutrients, which role do biomolecules, such as proteins, carbohydrates, and lipids, NOT fulfill?
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Which of the following best describes the distinguishing factor between a nutrient and an essential nutrient?
Which of the following best describes the distinguishing factor between a nutrient and an essential nutrient?
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Why is Vitamin C an essential nutrient for humans, but not for most other mammals?
Why is Vitamin C an essential nutrient for humans, but not for most other mammals?
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Which of the following correctly pairs a nutrient category with an example?
Which of the following correctly pairs a nutrient category with an example?
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How do vitamins primarily support enzyme function?
How do vitamins primarily support enzyme function?
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What is the most likely consequence of a thiamine (Vitamin B1) deficiency?
What is the most likely consequence of a thiamine (Vitamin B1) deficiency?
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Which of the following best illustrates the concept of homeostasis in a living organism?
Which of the following best illustrates the concept of homeostasis in a living organism?
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A scientist observes a species of bird that migrates south for the winter. Which characteristic of life is best exemplified by this observation?
A scientist observes a species of bird that migrates south for the winter. Which characteristic of life is best exemplified by this observation?
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Which of the following processes is most directly related to growth as a characteristic of life?
Which of the following processes is most directly related to growth as a characteristic of life?
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According to the first law of thermodynamics, what happens to energy within a system?
According to the first law of thermodynamics, what happens to energy within a system?
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A plant bending toward a light source is an example of:
A plant bending toward a light source is an example of:
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How does the second law of thermodynamics relate to the catabolic processes in living organisms?
How does the second law of thermodynamics relate to the catabolic processes in living organisms?
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Why is carbon considered the basis of life on Earth?
Why is carbon considered the basis of life on Earth?
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What is the role of ATP in living organisms, according to the text?
What is the role of ATP in living organisms, according to the text?
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Which of the following scenarios best illustrates adaptation in a population of organisms?
Which of the following scenarios best illustrates adaptation in a population of organisms?
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Which of the following statements best describes the relationship between anabolism and the second law of thermodynamics?
Which of the following statements best describes the relationship between anabolism and the second law of thermodynamics?
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Which statement accurately describes the relationship between anabolism and catabolism?
Which statement accurately describes the relationship between anabolism and catabolism?
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In a thermodynamic system, energy from food is transformed into which of the following?
In a thermodynamic system, energy from food is transformed into which of the following?
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Why is water considered essential for life?
Why is water considered essential for life?
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During biochemical processes, what byproducts are typically produced when energy is extracted from food?
During biochemical processes, what byproducts are typically produced when energy is extracted from food?
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Which of the following best describes the flow of energy in a typical physical thermodynamic system?
Which of the following best describes the flow of energy in a typical physical thermodynamic system?
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Life is composed of similar biological molecules. Which of the following is NOT one of those classes?
Life is composed of similar biological molecules. Which of the following is NOT one of those classes?
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Which of the following best describes the organization of life, from the smallest to the largest scale?
Which of the following best describes the organization of life, from the smallest to the largest scale?
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If scientists discover a new organism, which of the following molecular characteristics would support the classification of the organism as 'life'?
If scientists discover a new organism, which of the following molecular characteristics would support the classification of the organism as 'life'?
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Which process is most closely associated with the maintenance of life at a cellular level?
Which process is most closely associated with the maintenance of life at a cellular level?
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A scientist is studying a cell that can't reproduce. Based on the conventional definitions of life, what conclusion can be made?
A scientist is studying a cell that can't reproduce. Based on the conventional definitions of life, what conclusion can be made?
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How do catabolism and anabolism work together during metabolism?
How do catabolism and anabolism work together during metabolism?
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Which of the following scenarios violates the shared molecular characteristics of life?
Which of the following scenarios violates the shared molecular characteristics of life?
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Two newly discovered organisms are examined. Organism X has a complex cellular structure but cannot reproduce or metabolize. Organism Y can metabolize and reproduce but lacks a defined cellular organization. Which organism is more likely to be classified as 'life' and why?
Two newly discovered organisms are examined. Organism X has a complex cellular structure but cannot reproduce or metabolize. Organism Y can metabolize and reproduce but lacks a defined cellular organization. Which organism is more likely to be classified as 'life' and why?
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A scientist discovers an alien organism that uses a different set of biomolecules than those found on Earth. However, it still maintains organization, can reproduce, and undergoes metabolic processes. How would this discovery impact the current understanding of 'life'?
A scientist discovers an alien organism that uses a different set of biomolecules than those found on Earth. However, it still maintains organization, can reproduce, and undergoes metabolic processes. How would this discovery impact the current understanding of 'life'?
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How does the metabolism of living organisms affect the entropy of the universe?
How does the metabolism of living organisms affect the entropy of the universe?
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Why do cells utilize ATP as a common energy currency instead of directly using the energy from various food sources for different types of work?
Why do cells utilize ATP as a common energy currency instead of directly using the energy from various food sources for different types of work?
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During cellular respiration, what role does ATP play, in relation to the initial energy source (e.g., carbohydrates)?
During cellular respiration, what role does ATP play, in relation to the initial energy source (e.g., carbohydrates)?
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Which of the following biomolecules is NOT considered a primary nutrient?
Which of the following biomolecules is NOT considered a primary nutrient?
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Which of the following is the most accurate comparison between monomers and polymers?
Which of the following is the most accurate comparison between monomers and polymers?
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If a molecule is described as an 'oligomer', approximately how many monomer units would you expect it to contain?
If a molecule is described as an 'oligomer', approximately how many monomer units would you expect it to contain?
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How do polymers form from monomers, and what type of bond is primarily involved in this process?
How do polymers form from monomers, and what type of bond is primarily involved in this process?
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Which of the following is NOT a characteristic of polymers?
Which of the following is NOT a characteristic of polymers?
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Consider a newly discovered biomolecule containing 75 amino acids linked together. How would this molecule be classified?
Consider a newly discovered biomolecule containing 75 amino acids linked together. How would this molecule be classified?
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What is a key difference in the roles of carbohydrates versus proteins in living organisms?
What is a key difference in the roles of carbohydrates versus proteins in living organisms?
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Flashcards
Growth
Growth
Life maintains a higher rate of building up than breaking down, leading to an increase in size and complexity.
Homeostasis
Homeostasis
Life regulates its internal environment to maintain a constant state despite external changes.
Response to Stimuli
Response to Stimuli
Life reacts in the short term to changes in the environment.
Adaptation
Adaptation
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Carbon-containing
Carbon-containing
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Reliance on Water
Reliance on Water
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Genetic Information
Genetic Information
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Metabolism
Metabolism
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Molecular characteristics of life
Molecular characteristics of life
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Laws of thermodynamics
Laws of thermodynamics
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1st Law of Thermodynamics
1st Law of Thermodynamics
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2nd Law of Thermodynamics
2nd Law of Thermodynamics
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ATP
ATP
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Anabolism
Anabolism
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Biochemical transformations
Biochemical transformations
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Entropy
Entropy
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Energy Currency
Energy Currency
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ATP Production
ATP Production
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Biomolecules
Biomolecules
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Monomer
Monomer
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Dimer
Dimer
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Oligomer
Oligomer
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Polymer
Polymer
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Nutrients
Nutrients
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Types of Work in Cells
Types of Work in Cells
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Essential Nutrient
Essential Nutrient
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Micronutrient
Micronutrient
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Macronutrient
Macronutrient
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Vitamins
Vitamins
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Microminerals
Microminerals
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Macrominerals
Macrominerals
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What constitutes life?
What constitutes life?
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Molecule
Molecule
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Shared Molecular Characteristics
Shared Molecular Characteristics
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Glucose in Life
Glucose in Life
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DNA in Life
DNA in Life
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Organization (in Life)
Organization (in Life)
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Study Notes
Basic Concepts of Life - Module 1
- Life, at the molecular level, is characterized by organization, not by disorganisation.
- Molecules are the smallest particles of a substance retaining its properties; they can be composed of one or more atoms
- Common examples include water (1 oxygen, 2 hydrogens)
- Life forms share common molecular characteristics: obeying thermodynamics, using ATP as energy currency, being formed of similar small and large biomolecules.
- Seemingly different organisms share similar molecular characteristics. They can all use glucose for energy, store their information in DNA, and convert food energy into ATP. This shows a remarkable similarity.
What is Life?
- A typical conventional definition of "life" includes several main characteristics.
Conventional Definitions of Life
- Organization: Life is composed of one or more cells—the basic units of life—which are organized into a whole organism (e.g., Homo sapiens). Tissues are made up of cells, and organs are made up of tissues, and so on. Biomolecules (carbohydrates, fats, proteins, nucleic acids) form even the cell itself.
- Reproduction: Life has the ability to produce new organisms. Reproduction involves either mitosis (one cell forming two new identical cells) or meiosis (processes to produce new organisms).
- Metabolism: Life undergoes chemical processes necessary for maintenance of life. Metabolism is the sum of catabolism (breakdown of substances to release energy) and anabolism (synthesis of substances that use energy). The study of biochemistry centers around metabolism.
- Growth: Life grows and maintains a higher rate of building up than breaking down. It increases in size and progresses from a simpler to a more complex form. The balance of catabolism and anabolism is important for growth.
- Homeostasis: Life maintains a constant internal state. This involves regulating internal conditions to maintain balance (e.g., sweating to cool down, shivering to warm up).
- Response to Stimuli: Life has the ability to respond to stimuli in the short term (e.g., microorganisms moving toward food or away from poison, plant leaves turning toward the sun, animals chasing prey).
- Adaptation: Life can respond to its environment over a long period of time. This is determined by genes and environment. Adaptations can include things like melanin pigment in the skin to protect against UV rays or giraffes developing long necks to reach leaves high in trees.
Other Proposed Features of Life
- Carbon-containing: Carbon is the fundamental element forming the basis of life on Earth.
- Reliance on water: Water is essential for the survival of all life forms.
- Genetic information: DNA and RNA store the blueprint of an organism.
What is a Molecule?
- A molecule is the smallest particle of a substance that retains its properties.
- A molecule can be composed of one or more atoms.
Biological Molecules
- Biological molecules can contain a few, or up to many thousands of atoms, and have nearly infinite possibilities.
- Examples include amino acids like serine and complex proteins such as alcohol dehydrogenase.
What elements (atoms) are in biomolecules?
- Biomolecules contain various elements, as indicated in the Periodic Table of Elements. Many are common elements on the Earth, and other elements are possible.
What elements form biomolecules in nature?
- Common elements form into molecules in various forms in nature, including gases, solids, and liquids.
Shared Molecular Characteristics of Life
- Life obeys the laws of thermodynamics.
- ATP is the common energy currency of life.
- Life is composed of similar biomolecules.
The 3 Molecular Characteristics of Life
- Life obeys the laws of thermodynamics (first and second laws).
- ATP (adenosine triphosphate) is the common energy currency of life.
- Life is composed of similar biomolecules, both small and large (carbohydrates, lipids, proteins, and nucleic acids).
1st Law of Thermodynamics
- Energy is neither created nor destroyed; it can only change from one form to another.
- In living organisms, the energy from food molecules is transformed (changed) into a usable form of chemical energy (ATP).
2nd Law of Thermodynamics
- All processes increase entropy (disorder).
- In living organisms, large food molecules (low entropy) are broken down into smaller molecules (high entropy) producing energy. This process is called catabolism. In contrast anabolism, the opposite process of increasing order, requires energy to occur
- The process of using energy to decrease entropy is an important aspect of maintaining order and performing essential functions in living organisms.
ATP - What is it?
- ATP is the common "energy currency" transferring energy in cells.
- ATP is produced during photosynthesis (plants) and cellular respiration (animals).
3rd Molecular Characteristic: Biomolecules
- Life is composed of very similar small and large biomolecules (carbohydrates, proteins, lipids, and nucleic acids).
- These biomolecules can be categorized into "small" (monomers, dimers, trimers, oligomers) and "large" (polymers, with hundreds or thousands of monomers).
- The nutrients in food are examples of biomolecules.
What is a Nutrient?
- A nutrient is any substance with nutritional value to an organism.
- Nutrients can provide energy or building blocks for maintaining, growing, and repairing the organism.
- Some nutrients can be made by the body ("non-essential"), while others must be obtained from food ("essential").
Micronutrients vs Macronutrients
- Micronutrients are required in small amounts (vitamins and microminerals).
- Macronutrients are required in large amounts (carbohydrates, proteins, lipids, and some minerals).
What do vitamins and minerals actually do?
- Vitamins act as co-factors for enzymes.
- Microminerals are important for the function of various proteins (e.g., iron is necessary for hemoglobin function).
Macronutrients: Energy Source
- Macronutrients (carbohydrates, lipids, and proteins) are primarily energy sources for organisms.
- However, they also have other functions (e.g., structural formation for organisms).
What about Nucleic Acids?
- Nucleic acids (DNA and RNA) are nutrients because they are crucial for maintaining, growing, and repairing the organism by containing genetic information.
- However, nucleic acids themselves might not be considered a crucial source of chemical energy (like carbohydrates, proteins, and lipids).
Nucleic Acid monomer: Nucleotide
- Nucleotides are the monomers of nucleic acids.
Nucleic Acid polymer: DNA
- DNA, the genetic material, is organized into chromosomes.
- DNA is double-stranded, and its bases are paired (A with T, G with C).
- Deoxyribose sugar and phosphates form the DNA backbone.
Nucleic Acid polymer: RNA
- RNA carries instructions from DNA for protein synthesis. This is complementary to DNA.
- RNA is single-stranded and uses uracil instead of thymine, in its base pairing. Ribose sugars form the RNA backbone.
Textbook Readings for the Next Module
- Textbook readings for next module include general chemistry topics such as nomenclature of chemical compounds, the structure and properties of hydrocarbons, chemical bonds, electronegativity and polarity, and isomers for the Biochemistry Module 2.
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Description
Test your understanding of macronutrients and micronutrients in living organisms with this quiz. Explore essential nutrients, their roles, and the effects of deficiencies in various biological contexts. Challenge yourself with questions on various nutrient types and their importance to human health.