MCB 3020L Lecture Notes - Lecture 9: World Federation Of Trade Unions, Prokaryotic Large Ribosomal Subunit, Start Codon

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26 Mar 2018

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How does the ribosome recognize the codons. transfer rna"s (trna)s. Non- translated rna molecules that carry amino acids to the amino acid. Anti codon group of bases that are complimentary bind to the codon on mrna. Organism vary in there number there can be 20 to 61 trnas. The wobble effect of the third base pairing. Specific enzyme charged for each trna molecule getting the correct amino acid. Posses binding sites: t-rna, anticodon, amino acid. Since codons are read in groups of 3 there are 3 possible reading frames. Piece of rna that begins with a start codon, ends with a stop codon, and is translated into a protein. Wobble- different codons that encode the same amino acid usually differ in their third base pair. Allow less ridgid base pairing at the 5" end and the 3" end of the codon. Site on mrna known as the shine dalgarno sequence. 16s rrna binds to the (rbs) (anti- shine dalgarno)

Related Questions

22. There are 20 amino acids and 64 possible codons. Which of the following is closer to the actual number of different tRNA molecules in a cell?

A. 4

B. 16

C. 20

D. 61

E. 64

23. There are 20 amino acids and 64 possible codons. How many different eukaryotic aminoacyltRNA synthetases are there? A. 1

B. 16

C. 20

D. 61

E. 64

24. Which way are the amino acid and tRNA attached in a charged tRNA?

A. Amino acid-5'tRNA3'-AMP B

. Amino acid-AMP-3'tRNA

C. AMP-amino acid-3'tRNA

D. Amino acid-3'tRNA5'-AMP

E. Amino acid-AMP-5'tRNA

25. The anticodon that recognizes the initiation codon in translation is

A. 5' AUG 3'

B. 3' AUG 5'

C. 5' ACU 3'

D. 5' UAC 3'

E. 3' UAC 5'

26. The first amino acid incorporated into a growing polypeptide

A. In bacteria is methionine and it is also methionine in eukaryotes

B. In bacteria is tryptophan, while it is methionine in eukaryotes

C. In bacteria is N-formyl methionine, while it is methionine in eukaryotes

D. In bacteria is N-formyl methionine and it is also N-formyl methionine in eukaryotes

E. In bacteria is methionine, while it is N-formyl methionine in eukaryotes

27. In E. coli the IF3 forces tRNAf Met to bind with

A. The A site of the ribosome

B. The P site of the ribosome

C. The E site of the ribosome

D. IF1

E. IF2

1. _________________________ is the name of the process that produces proteins using RNA molecules.

a.Transcription

b Translation

c. Replication

d. Mutagenesis

2. The peptide bonding site on the ribosome:

a. A site

b. P site

c. E site

d. D site

3. The name given to the bond formed between two amino acids.

a. Hydrogen bond

b. Double bond

c. Peptide bond

d. Negative bond

4. __________________________ is the movement of the mRNA molecule on the ribosome to open up the A-site for the new incoming amino acid.

a. Transformation

b. Mutation

c. Translocation

d. Initiation

5. What does the term semi-conservative mean.

a. Replication of RNA is semi-conservative, each new strand consists of one old strand of RNA and one new strand of RNA.

b. Replication of DNA is semi-conservative, each new strand consists of one old strand of DNA and one new strand of DNA.

c. Replication of DNA is semi-conservative, each new strand consists of new strands of nucleotides.

d. Transcription of RNA is semi conservative.

6. This molecule functions during protein synthesis to recognize the codon and bring the proper amino acid back to the ribosome for translation.

a. mRNA

b. tRNA

c. rRNA

d. DNA polymerase

7. What is meant by the base-pairing rule.

a. Bases on a single strand of DNA are always found as pairs

b. Adenine always base pairs with guanine; cytosine with thymine

c. Adenine always base pairs with thymine; cytosine with guanine

d. Bases on a single strand of RNA are found in pair.

8. In this step of protein synthesis, amino acids are added to a growing polypeptide chain.

a. Initiation.

b. Elongation.

c. Termination.

d. Transpiration.

9. Three complementary bases found in a mRNA are called ____________________.

a. Anti-codon.

b. Triplet.

c. Doublet.

d. Codons.

10. Which statement best describes the job or function of the messenger RNA.

a. Carries the map of the gene sequence in the form of codons to the cytoplasm

for translation of the protein.

b. It transfers amino acids to the ribosome for protein synthesis.

c. It forms the ribosomes.

d. It helps replicate DNA.

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MCB 3020L Lecture Notes - Lecture 9: World Federation Of Trade Unions, Prokaryotic Large Ribosomal Subunit, Start Codon

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