A.1.2.9-2.10 Genetic Information and the Universal Genetic Code

Front

Where is genetic information stored in a DNA molecule?

Back

Genetic information is stored in the base sequence of one of the two strands of a DNA molecule.

Front

How many possibilities are there for a sequence of two bases?

Back

There are 16 possibilities for a sequence of two bases.

Front

How many possibilities are there for a sequence of three bases?

Back

There are 64 possibilities for a sequence of three bases.

Front

What happens to the number of possible sequences as the number of bases increases?

Back

As the number of bases (n) increases, the number of possible sequences becomes immense.

Front

What is the diameter of a DNA molecule?

Back

The diameter of a DNA molecule is just 2 nanometres.

Front

What is a codon?

Back

A codon is a group of three bases in DNA or RNA that contains information in a coded form.

Front

How many different codons are there?

Back

There are 64 different codons.

Front

What do most codons specify?

Back

Most codons specify one particular amino acid.

Front

What signals the start of protein synthesis?

Back

One codon signals that protein synthesis should start.

Front

What signals the stop of protein synthesis?

Back

Three codons signal that protein synthesis should stop.