1) Use the following information to answer the next question.
Several different nucleic acids are involved in the process of getting a protein produced from a gene. DNA contains the “genetic code” for the protein. DNA is double-stranded, but only one strand is transcribed into mRNA. The mRNA then goes into the cytoplasm where it is translated into protein with the help of tRNA. At each stage of the process, there is base complementarity (A pairs with T/U and C pairs with G) between the nucleic acids involved to ensure the integrity of the DNA blueprint for the protein being produced. Therefore, some of the four strands of nucleic acids involved will match (except U replaces T in RNA) and some will have base complementarity.
Indicate whether there is matching (1) or base complementarity (2) between the following nucleic acids.
DNA sense strand and mRNA Answer
DNA sense strand and tRNA Answer
DNA antisense strand and mRNA Answer
mRNA and tRNA Answer
2) Below is a list of functions related to protein synthesis. Place the number for the function in the blank above its corresponding structure.
1. Copies the genetic code from DNA and carries it to the ribosomes
2. Splits DNA into two strands and transcribes mRNA from the antisense strand
3. Carries amino acids to the ribosome
4. Area on DNA antisense strand that RNA polymerase binds to begin transcription
Answer Answer Answer Answer
Promoter region mRNA RNA polymerase tRNA
3) The first nucleotide in every mRNA molecule ever produced is ___i___ and the first amino acid of every amino acid chain ever produced is ___ii___.
a. cytosine; threonine
b. guanine; alanine
c. adenine; methionine
d. uracil; lysine
4) A small section of mRNA codons has the following sequence:
CCU GUA CAC GUC
Some Amino Acids
1) Stop
2) Valine
3) Serine
4) Glycine
5) Proline
6) Alanine
7) Leucine
8) Arginine
9) Histidine
The numbers of the amino acids listed above coded for by the mRNA codons are Answer
, Answer , Answer, answer, and Answer
.
Record your answer in order from left to right codons.
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