7. Describe the range of sizes and shapes of human cells and relate this to function.
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Range of Sizes and Shapes: Human cells vary greatly in size and shape,
ranging from small cells like red blood cells (about 7-8 µm in diameter) to
large cells like neurons (up to several meters in length). Shapes can be
spherical, cuboidal, columnar, or irregular.
Relation to Function: The size and shape of a cell are related to its function.
For example, elongated neurons are designed to transmit electrical signals
over long distances, while red blood cells are biconcave to maximize
surface area for gas exchange.
1. Define the following terms: dissociate, anion, cation, solvent, solute, solution, acid,
and base.
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, 1. Definitions:
Dissociate: To split or break apart into smaller components, typically in the
context of molecules separating into ions or simpler molecules. For
example, when a salt like sodium chloride (NaCl) dissolves in water, it
dissociates into sodium (Na⁺) and chloride (Cl⁻) ions.
Anion: A negatively charged ion. It gains electrons to achieve a negative
charge. Examples include chloride (Cl⁻) and sulfate (SO₄²⁻).
Cation: A positively charged ion. It loses electrons to achieve a positive
charge. Examples include sodium (Na⁺) and potassium (K⁺).
Solvent: The substance in which a solute is dissolved to form a solution. In
most biological systems, water is the primary solvent.
Solute: The substance that is dissolved in a solvent. Examples include salts,
sugars, and gases.
Solution: A homogeneous mixture of a solute and a solvent. The solute is
evenly distributed within the solvent.
Acid: A substance that donates hydrogen ions (H⁺) in solution, increasing
the concentration of hydrogen ions. Acids have a pH less than 7. Examples
include hydrochloric acid (HCl) and acetic acid (CH₃COOH).
Base: A substance that accepts hydrogen ions (H⁺) or donates hydroxide
ions (OH⁻) in solution, decreasing the concentration of hydrogen ions.
Bases have a pH greater than 7. Examples include sodium hydroxide
(NaOH) and ammonia (NH₃).
3. Describe what a buffer is and how to 'neutralize' a solution.
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, Buffer: A solution that resists changes in pH when small amounts of acid or
base are added. Buffers typically consist of a weak acid and its conjugate
base, or a weak base and its conjugate acid. They help maintain pH stability
in biological systems.
Neutralize a Solution: To neutralize a solution means to add an acid to a
base or a base to an acid to bring the pH closer to neutral (pH 7). For
instance, adding hydrochloric acid (HCl) to sodium hydroxide (NaOH) will
neutralize the base, forming water and salt.
8. .Describe the general structure of amino acids and proteins and the functions of
proteins.
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Amino Acids: The basic building blocks of proteins. Each amino acid has a
central carbon atom bonded to a hydrogen atom, an amino group (NH₂), a
carboxyl group (COOH), and a variable R group (side chain) that
determines the specific properties of the amino acid.
Proteins: Composed of long chains of amino acids linked by peptide
bonds. Proteins have four levels of structure:
Primary: Sequence of amino acids.
Secondary: Alpha helices and beta sheets formed by hydrogen bonding.
Tertiary: Overall 3D shape formed by interactions among R groups.
Quaternary: Arrangement of multiple polypeptide chains.
Functions of Proteins: Proteins serve a wide range of functions, including:
Enzymes: Catalyze biochemical reactions.
Structural: Provide support and shape (e.g., collagen).
Transport: Carry substances (e.g., hemoglobin transporting oxygen).
Regulatory: Involved in cellular processes and signaling (e.g., hormones).
Defense: Protect against pathogens (e.g., antibodies).
3. What is the gross and net production of ATP from glycolysis?
Give this one a try later!
Range of Sizes and Shapes: Human cells vary greatly in size and shape,
ranging from small cells like red blood cells (about 7-8 µm in diameter) to
large cells like neurons (up to several meters in length). Shapes can be
spherical, cuboidal, columnar, or irregular.
Relation to Function: The size and shape of a cell are related to its function.
For example, elongated neurons are designed to transmit electrical signals
over long distances, while red blood cells are biconcave to maximize
surface area for gas exchange.
1. Define the following terms: dissociate, anion, cation, solvent, solute, solution, acid,
and base.
Give this one a try later!
, 1. Definitions:
Dissociate: To split or break apart into smaller components, typically in the
context of molecules separating into ions or simpler molecules. For
example, when a salt like sodium chloride (NaCl) dissolves in water, it
dissociates into sodium (Na⁺) and chloride (Cl⁻) ions.
Anion: A negatively charged ion. It gains electrons to achieve a negative
charge. Examples include chloride (Cl⁻) and sulfate (SO₄²⁻).
Cation: A positively charged ion. It loses electrons to achieve a positive
charge. Examples include sodium (Na⁺) and potassium (K⁺).
Solvent: The substance in which a solute is dissolved to form a solution. In
most biological systems, water is the primary solvent.
Solute: The substance that is dissolved in a solvent. Examples include salts,
sugars, and gases.
Solution: A homogeneous mixture of a solute and a solvent. The solute is
evenly distributed within the solvent.
Acid: A substance that donates hydrogen ions (H⁺) in solution, increasing
the concentration of hydrogen ions. Acids have a pH less than 7. Examples
include hydrochloric acid (HCl) and acetic acid (CH₃COOH).
Base: A substance that accepts hydrogen ions (H⁺) or donates hydroxide
ions (OH⁻) in solution, decreasing the concentration of hydrogen ions.
Bases have a pH greater than 7. Examples include sodium hydroxide
(NaOH) and ammonia (NH₃).
3. Describe what a buffer is and how to 'neutralize' a solution.
Give this one a try later!
, Buffer: A solution that resists changes in pH when small amounts of acid or
base are added. Buffers typically consist of a weak acid and its conjugate
base, or a weak base and its conjugate acid. They help maintain pH stability
in biological systems.
Neutralize a Solution: To neutralize a solution means to add an acid to a
base or a base to an acid to bring the pH closer to neutral (pH 7). For
instance, adding hydrochloric acid (HCl) to sodium hydroxide (NaOH) will
neutralize the base, forming water and salt.
8. .Describe the general structure of amino acids and proteins and the functions of
proteins.
Give this one a try later!
Amino Acids: The basic building blocks of proteins. Each amino acid has a
central carbon atom bonded to a hydrogen atom, an amino group (NH₂), a
carboxyl group (COOH), and a variable R group (side chain) that
determines the specific properties of the amino acid.
Proteins: Composed of long chains of amino acids linked by peptide
bonds. Proteins have four levels of structure:
Primary: Sequence of amino acids.
Secondary: Alpha helices and beta sheets formed by hydrogen bonding.
Tertiary: Overall 3D shape formed by interactions among R groups.
Quaternary: Arrangement of multiple polypeptide chains.
Functions of Proteins: Proteins serve a wide range of functions, including:
Enzymes: Catalyze biochemical reactions.
Structural: Provide support and shape (e.g., collagen).
Transport: Carry substances (e.g., hemoglobin transporting oxygen).
Regulatory: Involved in cellular processes and signaling (e.g., hormones).
Defense: Protect against pathogens (e.g., antibodies).
3. What is the gross and net production of ATP from glycolysis?
