Question

lesson 2: why are these substances so important for life? unit question: how should we search for life beyond earth? lesson 2: student activity sheet 1. complete the table below for the molecules/ions stations. molecule | elements involved | water’s role | where are the charges? (+) and (-) | what patterns do you observe in how the elements connect? phospholipids | c, h, o, n, p | forms cell membrane (hydrophilic/ hydrophobic) | head: -, tail: neutral | contains p, c, h, o, n membrane proteins | c, h, o, n (s) | integral/peripheral (interact with water) | side chains: -, +/-, overall variable | primarily c, h, o, n, n - based structure nucleic acids | c, h, o, n, p | dissolve/stabilize (h - bonds) | phosphate: -, buses/sugar: neutral | contains p, c, h, o, n carbohydrates | c, h, o | soluble/hydrolysis/ dehydration | neutral (or - in complex carbs) | only c, h, o (no n/p/s) enzyme proteins | | | | metal ions | | | |

Explanation:

To complete the table for Enzyme Proteins and Metal Ions, we analyze their properties based on biological and chemical principles:

1. Enzyme Proteins

Elements Involved:

Enzymes are proteins, so they contain \( \boldsymbol{\text{C, H, O, N (S)}} \) (sulfur is present in some amino acids like cysteine).

Water’s Role:

Enzymes are soluble in water (aqueous environment) and function in hydrolysis/dehydration reactions (e.g., breaking down substrates or forming bonds). They also rely on water for conformational stability.

Where are the charges? (+) and (-):

Side chains of amino acids have variable charges: some are negative (\(-\)), some positive (\(+\)), or neutral. The overall charge varies (similar to membrane proteins).

What patterns do you observe in how the elements connect?

Primarily \( \boldsymbol{\text{C, H, O, N}} \)-based (peptide bonds link amino acids, forming a protein structure).

2. Metal Ions

Elements Involved:

Examples: \( \boldsymbol{\text{Fe, Mg, Ca, K, Na, Zn}} \) (specific metal elements, e.g., iron in hemoglobin, magnesium in chlorophyll).

Water’s Role:

Metal ions are solvated by water (hydrated) and can act as cofactors (stabilize enzyme structure or assist in reactions). Water also helps transport metal ions.

Where are the charges? (+) and (-):

Metal ions are typically \( \boldsymbol{\text{positive (+)}} \) (e.g., \( \text{Fe}^{2+}, \text{Mg}^{2+}, \text{Na}^+ \)).

What patterns do you observe in how the elements connect?

Metal ions form ionic bonds (e.g., with negatively charged functional groups in proteins or nucleic acids) or coordinate bonds (in complexes).

Filled Table (Key Cells):

Molecule	Elements Involved	Water’s Role	Where are the charges? (+) and (-)	What patterns do you observe in how the elements connect?
Metal Ions	Fe, Mg, Ca, K, Na, Zn (specific metals)	Solvate/stabilize (cofactor role)	Primarily + (e.g., \( \text{Fe}^{2+}, \text{Mg}^{2+} \))	Ionic/coordinate bonds with charged groups (e.g., proteins, nucleic acids)

for Patterns:

• Enzyme Proteins: Follow the same elemental pattern as membrane proteins (C, H, O, N-based) because they are proteins (polypeptides).
• Metal Ions: Consist of single metal elements (or small clusters) with positive charges, interacting with negatively charged biomolecules (e.g., phosphate groups in DNA, carboxyl groups in proteins).

If you need to fill the table with more specific details (e.g., exact metal ions), reference biological cofactors or ionic interactions in biochemistry.

Answer:

for Patterns:

• Enzyme Proteins: Follow the same elemental pattern as membrane proteins (C, H, O, N-based) because they are proteins (polypeptides).
• Metal Ions: Consist of single metal elements (or small clusters) with positive charges, interacting with negatively charged biomolecules (e.g., phosphate groups in DNA, carboxyl groups in proteins).

If you need to fill the table with more specific details (e.g., exact metal ions), reference biological cofactors or ionic interactions in biochemistry.