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Protein Synthesis - DNA and RNA

Dietary protein is not used efficiently as a source of energy. Although the gross energy of protein is greater than that of carbohydrate (23.6 kJ/g v 17.4 kJ/g for starch), when protein is used as an energy source the N has to be excreted as ammonia (fish), urea (mammals) or uric acid (birds). The ME value of protein at zero N retention takes into account the loss of energy in the excreta, such that the ME of protein and carbohydrate are approximately similar. The ME value for mammals and birds, however, does not take into account the energy costs of synthesising urea or uric acid and the cost of excretion in the kidney. Net energy (NE) of the diet represents the useful energy used to replace the losses of maintenance and the net deposition of energy as new tissue in growth or milk secretion during lactation, after subtracting the heat losses of metabolism.

As you will see in the diagrams of mitosis, first they duplicate and then each pair moves to a place called the pole of the cell and seems to anchor the spindle fibers.

Process of Mitosis
Interphase

Gap 1=The cell increases in size in preparation for division.
Synthesis= DNA synthesis (replication) occurs.
Gap 2= the cell continues to grow and synthesize RNA proteins.


Process of nuclear division of cells.

Prophase
Prophase = The DNA molecules progressively shortenand condense by coiling, to form chromosomes.

RNA is synthesized from viral DNA in an infected cell before protein synthesis begins.

Protein synthesis - Biology-Online Dictionary

Each nucleotide triplet, called a codon, can be "read" and translated into an amino acid to be incorporated into a protein being synthesized.

First, all of the 64 codons or triplets have a known function, with 61 coding for amino acids and the other 3 serving as a stop or termination signal for protein synthesis.

Protein synthesis :: DNA from the Beginning

The ribosome serves as the site and carries the enzymes necessary for protein synthesis. The ribosome is made from two sub units, 50S and 30 S.

Mild heating in the presence of reducing sugars or aldehydes results in loss of available lysine with little change in digestibility. Mild to moderate heating causes loss of sulphydryl groups, formation of disulphide cross links, racemisation of L to D-aspartic acid and reduced digestibility of all amino acids. Moisture content during heating is critical in both losses of available lysine and of sulphydryl groups. Mild processing gives best digestibility for monogastric animals and is especially important for young mammals and fish. Ruminant feeds benefit from more severe heat treatment and special processing to reduce protein degradability when amino acid composition is well balanced. Growth under commercial conditions is often less than under good experimental conditions, reflecting challenges to the immune system. Dietary proteins can both cause and affect an immune response. Dietary proteins may need special processing to reduce antigenic factors. The presence of dietary fibre, phytic acid or tannins in protein feeds reduce amino acid digestibility, increase endogenous N loss and the energetic cost of intestinal protein synthesis with consequent reduction in growth rate.

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Protein Synthesis - DNA and RNA. The Molecular Basis …


What are the three organelles involved in protein synthesis

What is the anticodon on the appropriate tRNA?

PROTEIN SYNTHESIS RNA Links the Information in DNA to the Sequence of Amino Acids in Protein | was discovered after DNA.

Protein Synthesis: Transcription & Translation

RNA occurs in the nucleus as well as in the cytoplasm (also remember that it occurs as part of the that line the rough endoplasmic reticulum).

Scientists for some time had suspected such a link between DNA and proteins.

Biology EOC Resources / Unit 7:DNA and Protein Synthesis

The messenger RNA carries the code into the cytoplasm where protein synthesis occurs. Basically, the mRNA is how the information of DNA (to make a protein) leaves the nucleus.

Genetic Code:

Each gene (or distinct segment) on DNA contains instructions for making one specific protein with order of amino acids coded by the nucleotides.

DNA and Protein Synthesis in the Cell

The following is a brief overview of how a gene (a section of the DNA molecule ) serves as a template for the synthesis of a protein . The process can be split into two phases.Transcription occurs first, followed by translation.

tRNA, mRNA and protein synthesis ..

Each sequence of 3 mRNA bases codes for a particular amino acid. For example, the mRNA sequence AUG codes for an amino acid called methionine. Ribosomes, the "machines" that carry out protein synthesis, attach themselves to the mRNA strand and move down it, reading' the sequence of nucleotides and putting together the appropriate protein as they move. The first set of 3 nucleotides the ribosome will read is always AUG. This is because the AUG sequence serves as a marker, telling the ribosome to "start reading here."

Inflating bacterial cells by increased protein synthesis



Protein Synthesis | Prokaryotic gene regulation differs from eukaryotic regulation, but since prokaryotes are much easier to work with, we focus on prokaryotes at this point.

Protein Synthesis - Ms. Blount's Biology Class 7

Similarly UCG is ser (2nd box on top) and ACG is thr (3rd box down in 2nd column.)

Types of RNA

Messenger RNA (mRNA) is synthesized from a gene segment of DNA which ultimately contains the information of the primary sequence of amino acids in a protein to be synthesized.

Unit 7: DNA and Protein Synthesis

In either case, the result of viral infection is that the virus' genetic material gets into the cell cytoplasm, which contains all the necessary enzymes and other materials that are needed for the replication of the virus' genetic material and the synthesis of its proteins.

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