大象传媒

Biological polymers

Biological are made naturally by . They are essential to life.

DNA

Genes are made of . DNA is a polymer made from four different , called . These join together in different combinations to make long strands. In a DNA , two strands wrap around each other to form a structure.

DNA strand showing bases pairs: TA, GC, AT repeated randomly.
Figure caption,
DNA, deoxyribonucleic acid, contains four different nucleotides (shown as T, A, G and C here)

Carbohydrates

polymers are made from sugar monomers. Plants turn the glucose (a type of sugar) produced during into carbohydrate polymers.

and are types of carbohydrates. They contain many molecules, joined together in long chains with branches.

A single glucose molecule and several glucose moleceules attached together, which make starch
Figure caption,
A simple model of starch

Proteins

are polymers made from different monomers, called . These join together in different combinations to make long strands, which then fold into complex shapes. Muscles and skin are built from proteins. are also built from proteins.

The covalent structures of glycine and alanine.
Figure caption,
Two different amino acids

Question

Name the monomers found in DNA, starch and proteins.