Question

Which of these are involved during the direct synthesis of a protein? a. mRNA, small ribosomal subunit, amino acid b. tRNA, large ribosomal subunit c. RNA polymerase, transcription factors d. a and b e. all of these

1. During protein translation, the codon on the mRNA matches to the complementary ____ .

   		codon on the amino acid
   		triplet on the DNA
   		anticodon on the tRNA
   		slot in the ribosome
   		trio on the polypeptide

1. During the electron transport chain, each protein is first ____ and then ____ .

   		reduced; oxidized
   		oxidized; reduced
   		phosphorylated; reduced
   		reduced; phosphorylated
   		oxidized; hydrogenated

Answer 1

1. synthesis of protein requires an mRNA (it provides the information on the protein sequence to be synthesised)

tRNA associated with an amino acid, and ribosome (both small and large subunit) ...RNA pol and transcription factors are required for synthesis of RNA from DNA ....so the ans is both a and b

2. during translation of protein, the codon on mRNA matches the complementary anticodon on the tRNA ...as the tRNA brings in amino acid, codons on mRNA determine the correct order of amino acid sequence by binding to specific complementary anticodons on the incoming tRNA.

3 during electron transport chain, protein complex transfers electron from NADH/FADH2 to the next protein complex and finally onto oxygen which gets reduced to water....the reacting molecule which looses electron is said to be oxidised while the molecule which gains electron is said to be reduced. ...so incase of the elctron transport chiain, theproteins are first reduced and then oxidised.