Question

1. If there is no ATP
   1. protein synthesis can’t start               
   2. protein synthesis will stop at the middle
   3. elongation step will be diminished
   4. termination step can’t proceed

2.    If there are no chaperones
   1. the ribosome can’t make the protein            
   2. the large ribosomal subunit can’t detach
   3. the protein still will be active
   4. the protein won’t make the native state         

3.   The large subunit of the ribosome binds to the small subunit
   1. after the aminoacyl-t-RNA has joined                                        
   2. before the aminoacyl-t-RNA has joined
   3. after the protein has been made
   4. before the stop codon

4.   The proofreading for the synthesis of proteins is
   1. at initiation step                      c. at termination                                
   2. at elongation                           d. nonexistent

5.   The binding of the amino acid in aminoacyl-tRNA is a (n)
   1. amide                          c. hemiacetal
   2. ester                            d. ether

Answer 1

1. Option A is correct. Initiation step of protein synthesis requires ATP for activation of amino acids. Protein synthesis can't start in absence of ATP.

2. Option D is correct. Protein won't make the native state because chaperones help in folding of proteins.

3. Option​ A is correct. The larger subunit of ribosome binds to the small subunit after the amino-acyl-tRNA has joined.

4. Option b is correct. At elongation stage, proofreading takes place and go so on. Proofreading is done by DNA polymerase-1 and is done along with the new chain synthesis.

5. Option B is correct i.e, ester.