Universal Genetic Code

What amino acid is represented by the codon UUA?

• Phenylalanine

• Tyrosine

• Leucine

• Stop codon

A sequence of DNA is transcribed into an RNA sequence. This RNA sequence reads 5′3′-UACGAGAACCGA-.Use the codon wheel provided to determine the sequence of amino acids.

• Tyr, Asp, Gln, Pro

• His, Glu, Thr, Arg

• Stop, Asp, Lys, Pro

• Tyr, Glu, Asn, Arg

• Ser, Gly, Gln, Ser

Tags

NGSS.HS-LS1-1

The genetic code is redundant, or degenerate, because

• Any one error destroys the code

• Each amino acid is coded for by multiple codons

• Just look at the people around you....

• DNA is unstable and often changes order

A student reads the following sequence of mRNA bases: UACGAGAACCGA. They divide it up into the following codons: UACG AGAA CCGA. What is wrong with this sequence of codons?

• The codons overlap.

• Codons should be 3 bases long.

• Codons should be read as DNA bases.

• There is nothing wrong; this sequence is correct.

A student reads the following sequence of mRNA bases: UACGAGAACCG. They divide it up into the following codons: UAC CGA AGA AAC CCG. What is wrong with this sequence of codons?

• Codons should be read as DNA bases.

• The codons overlap.

• Codons should be 4 bases long.

• There is nothing wrong; the sequence is correct.

The ______ code is the universal code of three-base codons which encodes the genetic instructions for the amino acid sequence of proteins.

Tags

NGSS.HS-LS1-1

The entire genetic code consists of ___ amino acids and ___ codons.

• 20, 64

• 30, 68

• 20, 20

• 30, 75

Translation always starts with a(n) _______ codon

• AUG

• UAG

• AAA

• GUA

What is the universal genetic code?

• A set of rules by which information encoded in genetic material is translated into proteins by living cells.

• A code that is unique to each species and determines its genetic traits.

• A code that only applies to human DNA sequences.

• A code that changes with each generation.

Tags

NGSS.HS-LS1-1

Which of the following statements about the universal genetic code is true?

• It is identical in all organisms, from bacteria to humans.

• It varies significantly between different species.

• It only applies to eukaryotic organisms.

• It is used only in the synthesis of carbohydrates.

Tags

NGSS.HS-LS1-1