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Lesson Worksheet: The Genetic Code Biology
In this worksheet, we will practice describing the nature of the genetic code and recalling how information is transferred from DNA to protein.
Which of the following correctly describes the features of the genetic code?
- AIt is degenerate, organism specific, and nonoverlapping.
- BIt is degenerate, universal, and nonoverlapping.
- CIt is universal, organism specific, and nonrepeating.
In a sequence of RNA, 3 bases code for an amino acid. There are 64 possible combinations. However, there are only 20 standard amino acids in humans. What does this suggest?
- AWe have not discovered 44 amino acids yet.
- BThe same amino acid can be coded for by more than one codon.
- CWe have not discovered 44 codons yet.
- DThe same codon can be determined by more than one amino acid.
The genetic code is considered universal; what does this mean?
- AAn amino acid can be specified by more than one codon.
- BEach codon codes for the same amino acid in nearly all organisms.
- CEach codon corresponds to a unique amino acid.
- DThe sequence of bases in all organisms is the same.
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?
- AThe codons overlap.
- BCodons should be 3 bases long.
- CCodons should be read as DNA bases.
- DThere is nothing wrong; this sequence is correct.
The amino acid alanine can be coded for by the codons GCU, GCC, GCA, or GCG. What feature of the genetic code is this an example of?
- AIt is specific for each organism.
- BIt is universal.
- CIt contains no repeated codons.
- DIt is degenerate.
- EIt is nonoverlapping.
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?
- ACodons should be read as DNA bases.
- BThe codons overlap.
- CCodons should be 4 bases long.
- DThere is nothing wrong; the sequence is correct.
A sequence of DNA is transcribed into an RNA sequence. This RNA sequence reads . Use the codon wheel provided to determine the sequence of amino acids.
- ATyr, Asp, Gln, Pro
- BHis, Glu, Thr, Arg
- CStop, Asp, Lys, Pro
- DTyr, Glu, Asn, Arg
- ESer, Gly, Gln, Ser
The diagram provided shows a basic outline of the central dogma of molecular biology.
What process has been replaced by label X?
What process has been replaced by label Y?
The genetic code is universal, meaning it is conserved throughout all organisms that use DNA as genetic material on Earth. Which theory is this strong evidence of?
- AThe theory that living organisms appeared independently at different times
- BThe theory of common ancestors for all organisms
- CThe theory of spontaneous generation of life
- DThe theory of homeostasis