تمارين أونلاين Biology Unit2 ch2 lesson one ||| Protein Synthesis.

From the regulatory proteins is the………………..

The gene expresses itself through………………..

If the function of an enzyme in the cell is to stop the action of a certain gene, which of the following represents the best way for that?…………..

Based on your study, the number of tRNA molecules types that participate in protein synthesis process in the living organisms is………….

The number of codons from which the amino acids are translated equals…….

In the opposite figure that represents the building

unit of mRNA, part (X) binds to ……………

The tRNA molecule keeps its specific shape by the help of ……………

The…………….molecule is responsible for reading the languages of amino acids and nucleotides.

A polypeptide contains the amino acids shown in the opposite table and their codons, which anticodons on the tRNA molecule are needed for the protein synthesis process respectively ? ………………….

The least number of amino acids codons on mRNA is…………………..

If there was a protein composed of 300 amino acids, therefore the number of turns of DNA molecule that will be transcribed to form this protein is approximately ……………..      turns.

If the number of nucleotides in a fragment of DNA molecule is 270 nucleotides, therefore the least number of the formed amino acids is………………..

The least number of tRNA molecules needed to form a polypeptide chain that contains 50 amino acids formed from 15 types is……………..         molecules.

To form a protein composed of 50 amino acids, the number of nucleotides that found on the mRNA molecule must be ………….. nucleotides.

If the number of nucleotides that found on mRNA is 45 nucleotides, therefore the number of nucleotides in a fragment of DNA molecule from which mRNA is transcribed is…………….. nucleotides.

A polypeptide chain consists of 12 amino acids, this represents a gene consists of…………………pair of nucleotides.

Which of the following can’t be an anticodon ? …………..

The opposite sequence shows a DNA strand segment, where can a thymine base be inserted in this segment to cause a mutation that stops the translation process ?…

After a new amino acid binds to the polypeptide chain, the ribosome moves on mRNA strand by……………… nucleotide(s) distance.

During mRNA transcription, the first triple code that follows the promoter on DNA is………………..

The………….determine(s) the type of amino acid that binds with the tRNA molecule.

The number of types of polymerase enzymes in the nucleus of a human body cell is……………………