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.

Q1:

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.

Q2:

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.

Q3:

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.

Q4:

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.

Q5:

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.

Q6:

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.

Q7:

A sequence of DNA is transcribed into an RNA sequence. This RNA sequence reads 53-UACGAGAACCGA-. 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

Q8:

A sequence of DNA is transcribed into an RNA sequence. This RNA sequence reads 53GCUUUCACGCAC. Use the codon wheel provided to determine the sequence of amino acids.

  • AArg, Ser, Thr, Pro
  • BSer, Leu, Ala, His
  • CAla, Phe, Thr, His
  • DSer, Leu, Ala, Gln
  • EAla, Leu, Thr, Gln

Q9:

The diagram provided shows a basic outline of the central dogma of molecular biology.

What process has been replaced by label X?

  • ATranscription
  • BMitosis
  • CTranslation
  • DSynthesis
  • EMeiosis

What process has been replaced by label Y?

  • ASynthesis
  • BMitosis
  • CTranscription
  • DMeiosis
  • ETranslation

Q10:

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

This lesson includes 18 additional questions for subscribers.

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