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Questions and Answers

What is the primary focus of biochemistry in relation to living organisms?

  • The structure of cells
  • Chemical processes and interactions within cells (correct)
  • The evolution of cellular structures
  • The classification of different cell types
  • Which statement best describes the biochemistry of cells?

  • It involves studying only individual isolated cells.
  • It encompasses the processes and interactions of biological cells. (correct)
  • It examines only the chemical composition of cells.
  • It studies the processes occurring within living organisms that are not cell-related.
  • How do chemical processes relate to living organisms in the context of biochemistry?

  • They are irrelevant to understanding cellular interactions.
  • They underlie the functional activities of cells and organisms. (correct)
  • They only occur during the formation of new cells.
  • They define the physical structure of the cells.
  • Which of the following is NOT a component of biochemistry as it relates to cells?

    <p>The study of non-biological chemical reactions (B)</p> Signup and view all the answers

    Which of the following inorganic ions is NOT typically found in cell mass?

    <p>Iron (Fe2+) (D)</p> Signup and view all the answers

    What is the primary role of inorganic ions in cellular functions?

    <p>They play critical roles in cell metabolism. (C)</p> Signup and view all the answers

    What does the study of biochemistry imply regarding living organisms?

    <p>Cells are the fundamental unit of life influenced by chemical reactions. (C)</p> Signup and view all the answers

    Which of the listed inorganic ions is positively charged?

    <p>Potassium (K+) (C)</p> Signup and view all the answers

    How much of the cell mass do inorganic ions generally constitute?

    <p>1% or less (B)</p> Signup and view all the answers

    Which inorganic ion is specifically mentioned as playing a role in kidney function?

    <p>Sodium (Na+) (B)</p> Signup and view all the answers

    What primarily composes the majority of a cell's structure?

    <p>Carbon-based molecules (C)</p> Signup and view all the answers

    What is organic chemistry primarily concerned with?

    <p>The study of carbon compounds (C)</p> Signup and view all the answers

    Which of the following statements best explains the importance of carbon?

    <p>Carbon can form stable bonds with a variety of elements. (D)</p> Signup and view all the answers

    Which of the following categories of molecules does not primarily consist of carbon-based compounds?

    <p>Salts (C)</p> Signup and view all the answers

    Why is the study of carbon compounds considered a foundational aspect of biological sciences?

    <p>Carbon compounds form the basis for all organic molecules. (A)</p> Signup and view all the answers

    How many electrons does carbon have in its second orbit?

    <p>4 (D)</p> Signup and view all the answers

    What is the maximum number of covalent bonds that carbon can form?

    <p>4 (A)</p> Signup and view all the answers

    Which of the following statements about carbon is true?

    <p>It can create multiple covalent structures. (C), It has 4 electrons in its outermost shell. (D)</p> Signup and view all the answers

    In terms of electron sharing, how does carbon's structure impact its ability to bond?

    <p>It allows for diverse bonding due to electron sharing. (B)</p> Signup and view all the answers

    Which characteristic of carbon is essential for its role in organic molecules?

    <p>Its ability to share 4 electrons for bonding. (B)</p> Signup and view all the answers

    Which of the following represents the basic formula of monosaccharides?

    <p>(CH2O)n (B)</p> Signup and view all the answers

    What is the primary type of sugar found in sports drinks?

    <p>Glucose (A)</p> Signup and view all the answers

    Which monosaccharide is known as 'milk sugar'?

    <p>Galactose (B)</p> Signup and view all the answers

    Which of the following statements is correct regarding glucose, fructose, and galactose?

    <p>They have the same chemical formula, C6H12O6. (B)</p> Signup and view all the answers

    Where is fructose predominantly found?

    <p>In honey (A)</p> Signup and view all the answers

    Which statement accurately describes polysaccharides?

    <p>They are polymers formed from numerous sugar monomers. (B)</p> Signup and view all the answers

    What is the basic structure of polysaccharides?

    <p>They consist of multiple sugar monomers linked together. (A)</p> Signup and view all the answers

    Which of the following is a characteristic of polysaccharides?

    <p>They are not soluble in water due to their complex structure. (C)</p> Signup and view all the answers

    What distinguishes polysaccharides from monosaccharides and oligosaccharides?

    <p>Polysaccharides are formed from many sugar monomers linked in long chains. (C)</p> Signup and view all the answers

    How are polysaccharides classified in relation to their structure?

    <p>They are classified as complex carbohydrates. (C)</p> Signup and view all the answers

    Flashcards

    Biochemistry of cells

    The study of chemical processes inside and between biological cells.

    Biochemistry

    The science of chemical processes in living things.

    Living organisms

    Anything that is alive.

    Biological cell

    The basic building block of living organisms.

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    Chemical processes

    The various chemical reactions happening within or between cells.

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    Inorganic Ions

    Inorganic ions are small, charged particles that are essential for cell function and make up less than 1% of a cell's mass.

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    Sodium (Na+)

    Sodium is a positively charged ion that plays a key role in nerve impulses and muscle contractions.

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    Potassium (K+)

    Potassium is a positively charged ion involved in nerve impulses and maintaining the proper balance of fluids in cells.

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    Calcium (Ca2+)

    Calcium is a positively charged ion that strengthens bones and teeth, helps muscles contract, and plays a role in blood clotting.

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    Phosphate (HPO42-)

    Phosphate is a negatively charged ion that forms the backbone of DNA and is important in energy storage.

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    Organic molecules

    Molecules containing carbon as their primary structural component, typically found in living organisms.

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    Organic chemistry

    The branch of chemistry focused on the study of carbon compounds, particularly those found in living organisms.

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    Why is carbon important in organic chemistry?

    Carbon's ability to form four stable bonds with other atoms, including itself, allows for the creation of complex and diverse molecules essential for life.

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    Carbon's bonding ability

    Carbon can form four covalent bonds with other atoms, including itself, allowing for the formation of long chains, branched structures, and rings, leading to diverse molecules.

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    Importance of organic molecules in cells

    Organic molecules make up the majority of cellular components, including proteins, carbohydrates, lipids, and nucleic acids, which are critical for various biological processes.

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    Carbon's Valence Electrons

    Carbon has 4 electrons in its outermost energy level (the second orbit), making it capable of forming 4 covalent bonds.

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    Covalent Bond

    A type of chemical bond where two atoms share electrons to achieve a stable outer shell.

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    What makes Carbon special?

    Carbon's ability to form up to four covalent bonds allows it to create complex and diverse molecules essential for life.

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    Carbon's Bonding Power

    Carbon can bond with other carbon atoms and a wide range of other elements, forming long chains and complex structures.

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    Why is Carbon so important?

    Because of its unique ability to form four covalent bonds, carbon is the foundation of all organic molecules, which are the building blocks of life.

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    Monosaccharides

    Simple sugars that consist of a single sugar molecule (monomer).

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    Basic Monosaccharide Formula

    The general formula for monosaccharides is (CH2O)n, where 'n' represents the number of carbon atoms in the molecule.

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    Glucose

    A monosaccharide found in sports drinks. It's a key energy source for the body.

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    Fructose

    A monosaccharide found in fruits. It's known as 'fruit sugar'.

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    Galactose

    A monosaccharide called 'milk sugar'. It's found in dairy products.

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    Polysaccharide

    A complex carbohydrate made up of many sugar monomers (simple sugars) linked together.

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    Polymer

    A large molecule made up of repeating smaller units called monomers. Polysaccharides are polymers.

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    What are some examples of polysaccharides?

    Examples include starch, glycogen, cellulose, and chitin. Each serves different functions in living organisms.

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    How are polysaccharides formed?

    They are formed by the joining of many monosaccharides through a process called dehydration synthesis, where a water molecule is removed.

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    Study Notes

    Biochemistry of Cells

    • Biochemistry is the study of chemical processes within and relating to living organisms
    • Living organisms consist of cells
    • Biochemistry of cells involves studying processes within individual cells and interactions between cells

    Cell Composition

    • Cells are composed of:
      • Water
      • Inorganic ions
      • Organic molecules (carbon-based)

    Water (Biochemistry of Cells)

    • Water is the most abundant molecule in cells, constituting 70% or more of total mass
    • The amount of water can vary in different cell types
    • Water is called the "universal solvent" due to interactions with other cell constituents
    • Water is essential for most bodily reactions

    Inorganic Ions (Biochemistry of Cells)

    • Inorganic ions make up 1% or less of the cell's mass
    • Important inorganic ions include:
      • Sodium (Na+)
      • Potassium (K+)
      • Magnesium (Mg2+)
      • Calcium (Ca2+)
      • Phosphate (HPO42-)
      • Chloride (Cl-)
      • Bicarbonate (HCO3-)
    • These ions play critical roles in cell metabolism and function

    Organic Molecules (Biochemistry of Cells)

    • Organic molecules, mostly carbon-based molecules, form the rest of the cell
    • The study of carbon compounds is called organic chemistry
    • Organic molecules are crucial for cell structure and function

    Carbon's Importance

    • Carbon has four electrons in its outer shell, allowing it to form up to four covalent bonds with other atoms
    • This versatility enables carbon to create diverse and complex molecules, essential for life

    Types of Carbon-Based Molecules

    • Four main types of carbon-based molecules in living things are:
      • Carbohydrates
      • Lipids
      • Proteins
      • Nucleic Acids

    Polymers

    • Some macromolecules are called polymers, built from smaller molecules called monomers

    Carbohydrates

    • Carbohydrates are simple sugars
    • Monosaccharides: 
      • Glucose, fructose, galactose
    • The formula for monosaccharides is (CH2O)n
    • Glucose is found in sports drinks
    • Fructose is found in fruits
    • Honey contains glucose and fructose
    • Galactose is called "milk sugar"
    • Monosaccharides form ring structures in aqueous solutions
    • Glucose is a primary source of energy for cells
    • Disaccharides:
      • Sucrose (table sugar)
      • Lactose (milk sugar)
      • Maltose (grain sugar)
    • Disaccharides are formed from joining two monosaccharides through a dehydration reaction
    • Polysaccharides:
      • Starch (glucose monomers)
        • Plants store starch
        • Potatoes and grains are sources of starch
      • Cellulose (glucose monomers)
        • Humans cannot digest cellulose
        • Cellulose is a major component of plant cell walls
      • Glycogen (glucose monomers)
        • Animals store glycogen
    • Isomers have the same chemical formula but different structural formulas

    Lipids

    • Lipids are insoluble in water but soluble in alcohol
    • Lipids have four major functions in cells:
      • Storing energy
      • Insulating the body
      • Cushioning and protecting organs
      • Forming components of cell membranes
    • Types of Lipids:
      • Fats
      • Waxes
      • Steroids
      • Oils
    • Triglycerides are composed of glycerol and three fatty acid chains
    • Glycerol forms the backbone of the fat
    • Phospholipids are the main components of cell membranes
    • Steroids have a carbon skeleton bent into four fused rings
    • Cholesterol is a base steroid from which other steroids are derived
    • Estrogen and testosterone are examples of steroids

    Proteins

    • Proteins are polymers made of amino acids
    • Proteins are used for building cells, acting as hormones, and doing much of the cell's work
    • Many proteins act as catalysts (enzymes)
    • Enzymes control the rate of chemical reactions
    • Proteins consist of four types:
      • Structural
      • Transport
      • Contractile
      • Storage
    • Proteins are composed of 20 different amino acids
    • Amino acids are linked together, forming polypeptide chains
    • Oligopeptides are composed of 2-10 amino acids
    • Dipeptides contain 2 amino acids
    • Tripeptides contain 3 amino acids
    • Polypeptides include more than 10 amino acids, forming proteins
    • Proteins have primary, secondary, tertiary, and quaternary structures
      • The primary structure is the sequence of amino acids
      • The secondary structure involves coiling and folding
      • Tertiary structure is the result of interactions between side chains
      • Quaternary structure is the overall structure of multiple polypeptide chains bonding together

    Nucleic Acids

    • Nucleic acids store hereditary information
    • Nucleic acids contain instructions for making proteins
    • Two types of nucleic acids exist:
      • DNA (deoxyribonucleic acid)
      • RNA (ribonucleic acid)
    • DNA is located in the nucleus of eukaryotic cells
    • Nucleic acids are polymers of nucleotides
    • Nucleotides have three parts: a phosphate group, a sugar, and a base
    • DNA and RNA are linked by phosphodiester bonds
    • DNA bases: Adenine (A), Guanine (G), Thymine (T), Cytosine (C)
    • RNA bases: Adenine (A), Guanine (G), Uracil (U), Cytosine (C)
    • DNA forms a double helix, RNA forms a single helix
    • Differences between DNA and RNA:
      • The sugar (deoxyribose in DNA, ribose in RNA)
      • The bases (thymine in DNA, uracil in RNA)

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