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Home⇒ Medical Science⇒ Biochemistry⇒ Protein synthesis
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q1 ⇒ Amino acids are joined together into a protein chain by which of the following? Transfer RNA [other wrong options] [Discuss in forum] DNA polymerase Hydrogen bonds Messenger RNA |
Q2 ⇒ Signal peptide protein removal that is translocated across a membrane is accomplished by signal peptidase [other wrong options] [Discuss in forum] fMet aminopeptidase trypsin chymotrypsin |
Q3 ⇒ Processive synthesis is a characteristic feature of DNA Pol III at a replication fork. [other wrong options] [Discuss in forum] all DNA polymerases. removal of RNA primers on Okasaki fragments. DNA mismatch repair |
Q4 ⇒ A polysome could be best described as an active site of protein synthesis. [other wrong options] [Discuss in forum] an active site of DNA synthesis. an active site of lipid synthesis. all of the above. |
Q5 ⇒ Which of the following is not necessary for protein synthesis to occur, once transcription is completed? DNA [other wrong options] [Discuss in forum] tRNA Ribosomes mRNA |
Q6 ⇒ The anticodon of tRNA binds to an mRNA codon [other wrong options] [Discuss in forum] binds to rRNA binds to an amino acid binds to the Shine Dalgarno sequence |
Q7 ⇒ The ribosomes are composed of both (a) and (b) [other wrong options] [Discuss in forum] proteins RNA lipids |
Q8 ⇒ The structure in a bacterium that indicates an active site for protein synthesis is a polysome. [other wrong options] [Discuss in forum] a chromosome. a cell membrane, a flagellum. |
Q9 ⇒ The site on a bacterial chromosome that marks the termination point for chromosome replication is called ter [other wrong options] [Discuss in forum] a stop codon. a stem-loop pau |
Q10 ⇒ The growing polypeptide chain is released from the ribosomes when a chain terminating codon is reached [other wrong options] [Discuss in forum] a chain terminating tRNA binds to the ribosome the 7-methyl guanosine cap is reached the poly A tail is reached |
Q11 ⇒ Eukaryotic mRNA binding to the ribosomes is facilitated by __________ . the 7-methyl guanosine cap [other wrong options] [Discuss in forum] the Shine Dalgarno sequence tRNA poly A tail |
Q12 ⇒ Ribosomes select the correct tRNAs solely on the basis of their anticodons [other wrong options] [Discuss in forum] then bind to the appropriate mRNA depending on their abundance in the cytosol with the least abundant anticodons |
Q13 ⇒ The peptidyl transferase reaction occurs on the large subunit [other wrong options] [Discuss in forum] on the small subunit between the subunit none of these |
Q14 ⇒ Which is required for protein synthesis? All of these [other wrong options] [Discuss in forum] tRNA mRNA rRNA |
Q15 ⇒ Type I proteins (plasma membrane) have a cleavage N- terminal signal sequence and a hydrophobic stop transfer sequence [other wrong options] [Discuss in forum] cleavaged N- terminal signal sequence that doubles as the membrane anchoring sequence multiple signal sequence and a hydrophobic stop transfer sequence multiple signal sequence that doubles as the membrane anchoring sequence |
Q16 ⇒ Protein synthesis rates in prokaryotes are limited by the rate of mRNA synthesis. If RNA synthesis occurs at the rate of 50 nucleotides/sec, then rate of protein synthesis occurs at 17 amino acids/sec [other wrong options] [Discuss in forum] 10 amino acids/sec 25 amino acids/sec 50 amino acids/sec |
Q17 ⇒ The pathway of a tRNA during polypeptide elongation on the ribosome is A site → P site → E site [other wrong options] [Discuss in forum] P site → entry site → exit site A site → P site → entry site P site → A site → E site |
Q18 ⇒ The first step in translation is binding of mRNA to the small ribosomal subunit [other wrong options] [Discuss in forum] binding of the two ribosomal subunits to each other binding of mRNA to the two ribosomal subunits binding of tRNA to the small ribosomal subunit |
Q19 ⇒ Which of the following is not a necessary component of translation? Ligase [other wrong options] [Discuss in forum] Anticodon mRNA Amino acid |
Q20 ⇒ Proteins contain __________ different amino acids, whereas DNA and RNA are composed of __________ different nucleotides 20,4 [other wrong options] [Discuss in forum] 20,64 3,20 4,20 |
Or |