Task 1. Match the words to their corresponding meaning Pepsin Hemoglobin Cell Bacteria Nucleotide DNA Molecule Keratin

The smallest structural and functional unit of an organism

A substance that carries genetic information in the cells of body

Is an organic molecule that is the building block of DNA and RNA

The smallest unit into which any substance can be divided without loosing its own chemical nature, usually consist of two or more atoms

A small living thing, some of which causes diseases and illness

A red protein responsible for transporting oxygen in the blood of vertebrates.

Chemical substance made by living cells that breaks down protein in food in the stomach and is produced by glands there.

A fibrous protein forming the main structural constituent of hair, feathers, hoofs, claws

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