threadlike structures that assist in movement cylindrical tubular organelles that are involved in cell division tube-like structures that are the site of protein and lipid synthesis contain chlorophyll and are the site of photosynthesis the sites of cellular respiration and energy production digestion organelles that break down biomolecules into smaller molecules chloroplasts arrowBoth centrioles arrowBoth endoplasmic reticuli arrowBoth mitochondria arrowBoth cilia and flagella arrowBoth lysosomes

1. amino acid refers to the fundamental building block of proteins, comprising of an amino group and a carboxyl group.

2. catalyst refers to any substance, which increases the rate of chemical reaction without being used up in the reaction.

3. a complex molecule containing he genetic code is dna or deoxyribonucleic acid.

4. an enzyme refers to a molecule of protein, which is unique in accelerating up a particular chemical reaction in the biological systems.

5. nucleic acid refers to an sequence of sugars, phosphates, and nitrogenous bases, for example, dna and rna.

6. a protein refers to a large, composite organic molecule comprising of a huge number of amino acids associated together with the of peptide bonds.

7. rna refers to a nucleic acid that takes part in the production of proteins.

8. substrate refers to a compound, which takes part in a chemical reaction, and is chemically modified by the reaction.