On the question of biology, or chemistry is okay.

Fructose ...... as the name suggestsfruits.

Sucrose is generally the sugar contained in plant stems (C12H22O11) and the main condiment for daily life (white sugar, rock sugar).

Starch is generally a sugar contained in plants, and the difference from the above is that it has no sweetness [(C6H10O5)N], and is often found in the seeds of potatoes, wheat, rice, etc. (to put it bluntly, it is a staple food).

It reacts with amylase in saliva to be converted into maltose.

Glucose: The sugar (C6H12O6) that can be directly absorbed by the human body is slowly oxidized in the body to produce CO2 and water to release energy.

Glycogen The basic way sugars are stored Generally all sugars are converted to glucose and then converted into glycogen for storage.

Ha ha. The sweetness is not the same

The uses are also different.

There are monosaccharides, disaccharides, and starch polysaccharides.

Some can be hydrolyzed, some cannot.

Reducibility is different.

In the exam, glucose and starch are generally tested--- which is the biggest difference.

Respect the answerer.

Not everyone comes to the questions to get a few points.

That last sentence doesn't seem appropriate.

Do you talk to teachers like that at school?

Fructose, with the addition of chemical elements, is a monosaccharide.

Sucrose, a kind of sugar extracted from plants, is a disaccharide (the main component of white sugar, rock sugar) glucose, a sugar with a variety of nutrients, is a monosaccharide.

Starch is a polysaccharide.

Glycogen, a mode of storage, is a polysaccharide.

My mom told me she was a biology teacher.

The subject may want to ask this question:

The narrative about biochemistry is wrong: aBiochemistry is the chemistry of lifeBiochemistry is Biology and Chemistry cBiochemistry is the chemistry d. in living organismsThe object of biochemistry is the study of living organisms.

What is wrong is option B

Biochemistry: Biochemistry is a discipline that studies chemical processes in organisms, as the name suggests, and is often referred to simply as biochemistry. It is mainly used to study the structure and function of various components in cells, such as proteins, sugars, lipids, nucleic acids and other biological macromolecules.

For chemical biology, the focus is on using methods in chemical synthesis to answer the relevant problems found in biochemistry.

The term biochemistry appeared around the late 19th and early 20th centuries, but its origins go back much further, and its early history is part of the early history of physiology and chemistry.

For example, in the 80s of the 18th century, a-l.Lavoisier proved that respiration is oxidation like combustion, and almost at the same time scientists discovered that photosynthesis is essentially the inverse process of plant respiration.

Another example is 1828 fWaller synthesized an organic substance urea for the first time in the laboratory, breaking the idea that organic matter can only be produced by living organisms, and dealing a major blow to the "vitalism".

1860 lPasteur proved that fermentation was caused by microorganisms, but he believed that a living yeast was necessary to cause fermentation. In 1897, the Birchner brothers discovered that the cell-free extract of yeast could be fermented, proving that such complex life activities could be carried out without living cells, and finally overturned the "theory of vitality".

Categories: Education, Science, >> Science & Technology.

Problem description: The primary structure of a polypeptide is leu-pro-ser-trp-ala. Try to describe the UV absorption spectra and fluorescence emission spectra measured in the peptide bench as early as 20, Tris-HCl, pH buffer.

Analysis: Because of the conjugated structure containing tryptophan.

So the maximum absorption wavelength is at 280nm.

In protein molecules, the only amino acid residue that can emit fluorescence is tryptophan.

TRP), tyrosine (TYR), and phenylalanine (Phe), whose fluorescence spectra are environmentally friendly.

Extremely sensitive, it becomes the study of protein structure, folding kinetics as well as eggs.

An ideal choice for white matter molecular interactions. Here are three kinds of amino groups.

Among acids, the fluorescence intensity of TRP is the highest, while the fluorescence intensity of Phe is very low.

In proteins that contain both TRP and TYR, due to their molecules occur.

Energy transfer from TYR residues to TRP residues, resulting in TYR residues.

Fluorescence quenching and increased fluorescence of TRP residues, making TRP the most commonly used.

As an endogenous probe to study the structure of proteins.

When TRP is an endogenous probe, the sample concentration is G ml

For TYR, the excitation wavelength is 274 nm, and the scanning range of the emission spectrum.

290 400 nm; In TRP, the excitation wavelength was 295 nm and scanned.

The range is 300 450 nmBoth the excitation and emission monochromators have bandwidths of 5 nm

Chemistry is the study of the properties and changes of matter at the molecular level. Biology is characterized by metabolism, metabolism is the process of biological absorption of nutrients, excretion of waste, the entire metabolic process from a microscopic perspective is the absorption and transformation of environmental substances by organisms, shouting and answering and these processes are at the molecular level, chemical changes occur.

For example, protein is an important part of the human body, and people obtain the basic raw materials (amino acids, etc.) that make up protein through food digestion, and through the complex transformation of DNA, RNA and other cell nuclei, and finally produce protein, the whole process is changed by amino acids - proteins, and molecules are chemical reactions.

Many macroscopic manifestations of biology are caused by microscopic chemical changes in the body, chemistry is a basic discipline, as the saying goes, mathematics, physics and chemistry are not separated, and biology is inseparable from the natural principles of mathematics, physics and chemistry.

Biochemistry is a must be learned in bioengineering, and the main research content of this book roughly includes several aspects, the chemical composition of organisms, the metabolism of substances in organisms, energy conversion, and metabolic regulation, and the information metabolism of organisms.

Biochemistry is the science that studies the chemical composition of living organisms, the various chemical changes that sustain life activities and their interconnections, that is, the science that studies the chemical nature of living activities.

The objects of biochemical research are living organisms, including viruses, archaea, eubacteria, yeasts, fungi, algae, and plants and animals.

The core of biochemistry is metabolism (mastering several major cycles in the human body, such as the metabolism of sugars, the three major carboxylic acid cycles, oxidative phosphorylation, photosynthesis, etc.), of course, the core will also focus on molecular biology, that is, some questions about the expression of gene regulatory proteins. These form the basis for future research, such as rotten diseases (which require the study of genetic and metabolic problems).

The theoretical foundation you need is organic chemistry and basic chemistry, as well as the basic theories in front of the biochemistry textbook. The latter is the knowledge of metabolism and synthesis, which needs the theoretical support of the front.

The biochemistry to understand is as follows:

The term biochemistry is explained as a marginal science that uses the theories and methods of chemistry to study biology.

Basic Definition: The marginal discipline that uses the theories and methods of chemistry to study living matter. Its mission is to understand the chemical composition and structure of organisms and the various chemical changes in life processes.

From the early study of the overall composition of organisms, to the precise analysis of various tissue and cell components.

Important biological macromolecules (e.g., proteins, nucleic acids, etc.) are being analyzed using spectroscopic analysis, isotope labeling, X-ray diffraction, electron microscopy, and other physical and chemical techniques in order to elucidate the diverse functions of these biomacromolecules and their specific structural relationships.

Classification: If biochemistry takes different organisms as the object, it can be divided into animal biochemistry, plant biochemistry, microbial biochemistry, insect biochemistry, etc. If the different tissues or processes of organisms are taken as the research objects, they can be divided into muscle biochemistry, neurobiochemistry, immune biochemistry, biomechanics, etc.

Due to the different substances studied, it can be divided into protein chemistry, nucleic acid chemistry, enzymology and other branches. Chemistry that studies various natural substances is called bioorganic chemistry.

The discipline that studies the biological functions of various inorganic substances is called bioinorganic chemistry or inorganic biochemistry. Since the 60s, the integration of biochemistry with other disciplines has given rise to some marginal disciplines, such as biochemical pharmacology, paleontochemistry, chemical ecology, etc. Or according to different application fields, it is divided into medical biochemistry, agricultural biochemistry, industrial biochemistry, nutritional biochemistry, etc.

At least the main connection between biology and chemistry is reflected in the close connection between the branch of molecular biology and the synthetic chemistry of drugs, which are studied from different perspectives on the same subject. One is to find the connection between macroscopic traits and microscopic genetic material in organisms; The other is to look for the chemical signatures of molecules that can affect microscopic genetic material.

It may not be very accurate, but the general meaning is that they all study various molecules in cells at the cellular level, with different emphases, and the research is one in the end.

To use a less appropriate analogy: one is studying the relationship between the mechanical structure of a car and its driving performance, and the other is studying the physical and chemical possibilities and methods for improving various mechanical structures.

1. The nitrogen content in most proteins is relatively constant, with an average of 16%, if the nitrogen content of 1 gram sample is measured to be 100mg, the protein content is 625 mg 100 16% = 625].

2. Weigh 25mg of protease into 25ml solution, take 2ml of solution to measure protein nitrogen, and take another solution to measure enzyme activity, the result can hydrolyze casein per hour to produce 1500 g of tyrosine, assuming that 1 enzyme activity unit is defined as the amount of enzyme that produces 1 g of tyrosine per minute, what is the protein concentration of the enzyme solution?

Answer: 2ml of solution is measured to contain protein nitrogen, so the protein contained in 2ml of solution is =

So, the protein concentration of the enzyme solution is: 2 ml = mg ml

Note: Protein concentration = protein content volume of protein solution, independent of enzyme activity information later].

The accuracy is about 100%, and the Kjeldahl method can be used.

The protein concentration of the enzyme solution is.

The protein content contained in 2ml is:

So the content of 1ml is, of course.