When translation is not performed by ribosome, both the large subunit and the small subunit of ribosome are free, and it mainly depends on:() ( ) 窗体顶端
A. The small subunit of ribosome could not bind to the large subunit when mRNA is not interacted with the small subunit. 窗体底端
B. The binding of small subunit to translation initiation factor 3(IF-3) prevents the combination of small subunit and larger subunit.
C. The small subunit of ribosome is not connected to the initiator tRNA,which is the bridge that promotes the combination of large subunit and small subunit. 窗体底端
D. Lack of necessary translation initiation factors in the small subunit,thus not able to combine with the large subunit.
查看答案
During the elongation process of translation, the amino acid carried by aminoacyl-tRNA will be transferred to the end of extended polypeptide chain carried by peptidyl-tRNA with the help of the large subunit of ribosome.() 窗体底端
Protein synthesis proceeds from 5'→ 3' of mRNA, and the synthesis of peptide chain starts from the N terminal.() 窗体底端
The initiation of translation contains three steps in prokaryotic cells, so which of the following step does not belong to these three steps:()
A. The small subunit of ribosome firstly recognizes and binds to the methylated 5' end of template mRNA.
B. The initiator aminoacyl-tRNA is inserted into P site of the ribosome small subunit to form the initiation complex. 窗体底端
C. Small subunit recognizes and binds to mRNA at ribosomal binding site (also known as SD sequence).
D. Large subunit binds to the initiation complex to form a complete ribosome. 窗体底端
In biosynthesis of protein, which of the following would be consumed besides ATP:() 窗体底端
A. CTP
B. UTP
C. GTP
D. ADP
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