Question

across

1. large molecule formed from smaller repeating units of identical compounds (monomers) linked by covalent bonds.
2. large molecule formed by joining smaller organic molecules together
3. protein that speeds up a biological reaction by lowering the activation energy needed to start the reaction
4. pure substances composed of only one type of atoms; cannot be broken down into another substance
5. substance that speeds up a chemical reaction by reducing the activation energy
6. carbon compound joined by peptide bonds building block of proteins
7. substance formed by a chemical reaction; located on the right side of the arrow in a chemical equation

down

1. pure substance with unique properties; formed when two or more different elements combine
2. energy - requiring process by which atoms or groups of atoms in substances are changed into different substances
3. a subunit of nucleic acid formed from a simple sugar, a phosphate group and a nitrogenous base. monomer for nucleic acids
4. substance that exists before a chemical reaction starts; located on the left side of the arrow in a chemical equation

Explanation:

This is a crossword - puzzle related to chemistry and biology concepts. Each clue describes a scientific term. For example, a large molecule formed from smaller repeating units of identical compounds (monomers) linked by covalent bonds is a polymer. A protein that speeds up a biological reaction by lowering the activation energy is an enzyme. A pure substance composed of only one type of atom is an element.

Answer:

Filling in the crossword puzzle would require matching these descriptions to appropriate words that fit the grid. Without actually filling the grid, we can identify the key terms from the clues:

1. Polymer
2. Macromolecule
3. Enzyme
4. Element
5. Catalyst
6. Amino - acid
7. Product
8. Compound
9. Chemical reaction
10. Nucleotide
11. Reactant