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Biochemistry

Biochemistry is the study of the structure, composition and chemical processes in all living organisms. It covers the structures and functions of various cellular components, including proteins, carbohydrates, nucleic acids, lipids, and other biomolecules.

8,065 Questions

What does emulsifier 476 consists of?

Its chemical name is Polyglycerol polyricinoleate (PGPR), or E476. PGRP is a yellowish, viscous liquid, and is strongly lipophilic: it is soluble in fats and oils and insoluble in water and ethanol. It is made up of a short chain of glycerol molecules connected by ether bonds, with ricinoleic acid side chains connected by ester bonds. E476 is an emulsifier made from glycerol and fatty acids (usually from castor bean, but also from soybean oil). In chocolate industry, to make compound chocolate and similar coatings, PGPR is mainly used with another substance like lecithin to reduce viscosity. It can also be used as an emulsifier in spreads and in salad dressings, or to improve the texture of baked goods.

Does urea contain protein?

The molecular formula of the urea is NH2-CO-NH2. The proteins are long chain of many amino acids. Urea is formed out of metabolism ( break down) of the amino acids.

What statement best describes the function of a competitive inhibitor in an enzyme-catalyzed reaction?

Competitive inhibitor is a substance that competes directly with a normal substrate for an enzymatic-binding site of an enzyme. Such an inhibitor usually resembles the substrate to the extent that it specifically binds to the active site of the enzyme but differs from it so as to be unreactive and therefore there will be no catalytic reaction. Some examples are: methotrexate that is competitive inhibitor of dihydrofolate reductase, and malonate which structurally resembles succinate (that is converted to fumarate by succinate dehydrogenase during the citric acid cycle) but cannot be dehydrogenated.

What is the monemor of proteins?

The monomer of proteins are amino acids. Amino acids are organic molecules that contain an amino group (-NH2) and a carboxyl group (-COOH), along with a side chain specific to each amino acid. Proteins are made up of long chains of amino acids linked together by peptide bonds.

How many number of amino acid residues in lysozyme?

Depending upon the source, here a few examples:


In humans: Lysozyme C, 148 aa; Lysozyme G, 142 aa; Lysosymes D1 and D2, 194 aa.

In bovines: Lysozyme C, 147 aa.

Lysozyme from fruit fly: 140 aa.

Lysozyme from mouse: 148 aa.


There is a wide variety of isoforms among species.

What are two ways hair can help an investigation?

Hair found at a crime scene can provide DNA evidence, which can link a suspect to the scene. Additionally, the analysis of hair can provide information about the individual's diet, toxins they may have been exposed to, and even their geographical origin.

What result would you expect if you mutate one of the four arms of a tRNA?

The tRNA will not be recognized by tRNA synthetase and cannot be charged.

Enzymes work by what-?

Enzymes work by reducing the energy of activation.

Are enzymes still functional after losing their shape?

enzymes are still functional after losing their shape as they depend onn their shape

What is the best speed to separate a soil sample in a centrifuge?

Very high speed is the best speed to separate a soil sample in a centrifuge.

Can DNA get extracted from a sterile cotton pad with blood?

Yes. You can get DNA from sterile cotton pad with blood for DNA finger printing.

If uekaryotic cell has one chromosome what is it called?

For a eukaryotic cell to have only one chromosome it must be a sex cell or a genome in an organism that normally only has 2 chromosomes per cell. I'm not sure if this is exactly what you mean...

What is mass produced in the electron transport chain?

In the electron transport chain, the main product that is mass produced is adenosine triphosphate (ATP). ATP is a high-energy molecule that serves as the primary source of cellular energy. It is generated by the electron transport chain through a series of redox reactions involving the transfer of electrons from electron donors to electron acceptors, ultimately resulting in the production of ATP.

Why sucrose cause the formation of pollen tubes?

Sucrose provides energy for the growth and elongation of pollen tubes through respiration. It also serves as a carbon source for cell wall synthesis and maintenance of turgor pressure, contributing to the physical growth of the pollen tube. Additionally, sucrose signaling pathways play a role in regulating gene expression and cellular processes involved in pollen tube growth.

What did you do before medicine was invented?

Before medicine was invented, many relied on natural remedies to help cure ailments. Natural remedies are still practiced today in modern culture as well.

Why are complex carbohydrates better for storing energy than simple sugar?

Simple sugar molecules will create lot of osmotic pressure in the cell. In case of glycogen, you have thousands of glucose molecules put together. Glycogen molecule is compact and does not produce much osmotic pressure.

How is statistics used in Analytical chemistry?

In Analytical chemistry and especially the analysis of elements the main purpose is to identify even very, very small traces of certain substances. So, now, if you want to check i.e. a tree or its leafs... concidering environmental pollution or whatever... you choose your zone, where you take the samples, the amount of every sample (equal everywhere would be best - recommended), etc. At the end, you got a bunch of numbers after having evaluated the i.e. leafs... but, is your result representing the reality... what's about your method for the measurement, any errors? Statistics in Analytical Chemistry helps to represent the results. It gives a possibility to indicate how precise this measurements are (with a range of errors). All this together allows a statement about the real situation... even if you only took a few hundred samples...

Why biuret reagent only kept in plastic bottle?

Biuret reagent should only be kept in a plastic bottle because it reacts with glass, which can contaminate the solution and give inaccurate results. Plastic is chemically inert and does not react with the reagent, ensuring the accuracy of the test results.

Does anabolism create a positive or negative nitrogen balance?

Anabolism creates positive nitrogen balance. That means sort of body building. Catabolism creates negative nitrogen balance. That means loss of proteins from your body.