MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Signal peptide protein removal that is translocated across a membrane is accomplished by |
| A. | trypsin |
| B. | fMet aminopeptidase |
| C. | chymotrypsin |
| D. | signal peptidase |
| Answer» E. | |
| 2. |
Amino acids are joined together into a protein chain by which of the following? |
| A. | DNA polymerase |
| B. | Transfer RNA |
| C. | Messenger RNA |
| D. | Hydrogen bonds |
| Answer» C. Messenger RNA | |
| 3. |
The ribosomes are composed of |
| A. | RNA |
| B. | proteins |
| C. | lipids |
| D. | both ( and ( |
| Answer» C. lipids | |
| 4. |
Which site of the tRNA molecule binds to the mRNA molecule? |
| A. | Codon |
| B. | Anticodon |
| C. | 5 prime end |
| D. | Amino acid |
| Answer» C. 5 prime end | |
| 5. |
The lac operon contains the z, y and a structural genes |
| A. | encoding p-galactosidase and galactose permeases |
| B. | encoding p-galactosidase, galactose permeases and thio-galactosidase transacetylase respectively |
| C. | None of the above |
| D. | encoding P-galactosidase only |
| Answer» E. | |
| 6. |
Eukaryotic mRNA binding to the ribosomes is facilitated by __________ . |
| A. | the 7-methyl guanosine cap |
| B. | the Shine Dalgarno sequence |
| C. | poly A tail |
| D. | tRNA |
| Answer» B. the Shine Dalgarno sequence | |
| 7. |
The direction of amino acid transfer to the growing polypeptide chain is |
| A. | from the P site to the A site on the ribosome |
| B. | from the A (aminoacyl tRNA site) site to the P (peptidyl tRNA site) site on the ribosome |
| C. | from the P site to the E site on the ribosome |
| D. | from the A site to the E (exit tRNA site) site on the ribosome |
| Answer» B. from the A (aminoacyl tRNA site) site to the P (peptidyl tRNA site) site on the ribosome | |
| 8. |
The anticodon of tRNA |
| A. | binds to an amino acid |
| B. | binds to rRNA |
| C. | binds to an mRNA codon |
| D. | binds to the Shine Dalgarno sequence |
| Answer» D. binds to the Shine Dalgarno sequence | |
| 9. |
Translation in prokaryotes begins by the formation of a 30S initiation complex between the |
| A. | 30S ribosomal subunit, tRNA and initiation factors |
| B. | 30S ribosomal subunit, mRNA, initiation factors and N-fMet tRNA |
| C. | 30S ribosomal subunit, mRNA and initiation factors |
| D. | 30S ribosomal subunit and mRNA only |
| Answer» C. 30S ribosomal subunit, mRNA and initiation factors | |