Explanation of junior high school biology terms, explanation of biochemistry terms

Supports the plant body, climbs on other things, absorbs nutrients, and retains moisture.

Reference: Aerial roots are roots that emerge from the ground and emerge from the air, and their functions vary depending on the species. The aerial roots, which mainly play a supporting role, are called proproot (tree), or propaerial root, and the undergrowth of tomato (lycopersium esculentum), maize (eea may) and other stems is the pillar aerial root.

The aerial roots of tropical plants such as pandanus tectorius, ficus bengalensis, and many mangrove plants (rhizop-horaceae) support the plant body on the one hand, and burrow into the ground to absorb roots. The aerial roots of plants such as Camp-sis grandiflora, Hedera rhombea, and Penglai banana [monstera deliciosa] have the effect of climbing other things. Many of the roots that belong to epiphytes are also known as aerial roots.

The layer that surrounds the stems of woody ferns such as cyathea spinulosa is mainly used to retain moisture, also known as aerial roots. It grows in the air above the surface of the earth and can absorb gases or support the upward growth of the plant body, and is commonly found in perennial herbaceous or woody plants.

On the one hand, plants absorb water, and on the other hand, they will release 90% of the absorbed water back into the air through transpiration, in short, plants can only fix 10% of water. However, plants will respire while absorbing water, and in winter it is generally more alienation than assimilation, that is, the absorption of oxygen is greater than the release of oxygen, and the indoor ventilation can not be done, and the oxygen will be slowly consumed by the plants, and the gains outweigh the losses.

If you must absorb water by raising plants, according to your indoor air humidity of 90%, it is estimated that you can only raise epiphytes native to tropical rainforest areas (banyan trees do not raise, its oxygen consumption is too large), it is recommended that you have some peculiar shapes and strong water absorption function, such as: bromeliads Tielan old man's beard; Some epiphytic orchids in the orchid family: such as Bandai orchid, Dendrobium orchid, Phalaenopsis orchid, flame orchid, etc.

To put it simply; support, absorbing oxygen.

1. Nucleosome: A structural unit used to package chromatin, which is composed of DNA strands wound around a histone nucleus.

2. DNA denaturation (DNADENATURATION) Under the action of physical and chemical factors, the two complementary strands of the DNA double helix are loosened and become single strands, which leads to changes in the physicochemical properties and biological properties of DNA, which is called DNA denaturation.

3. DNA renaturation: the process by which denatured DNA can re-associate two separate strands into a double helix structure under appropriate conditions.

4. Melting temperature (TM): the temperature corresponding to the midpoint value of the increase in ultraviolet absorption in DNA thermal denaturation. Or the pyrolysis chain temperature.

5. Hyperchromic effect: when DNA is denatured, the absorption of ultraviolet light at 260nm increases.

6.Hypochromic effect: A phenomenon in which ultraviolet absorption decreases with the refolding of nucleic acids.

7.Endonuclease (exonuclease): an enzyme in ribonucleases and deoxyribonucleases that hydrolyze phosphodiester bonds within nucleic acid molecules.

8.Exonuclease: An enzyme that hydrolyzes nucleotides one by one from one end of the nucleic acid strand.

Biochemistry, as the name suggests, is a discipline that studies chemical processes in living organisms and is often referred to simply as biochemistry.

A sub-discipline of chemistry. It is a basic life science that studies the chemical composition and structure of living substances and various chemical changes in the process of life activities.

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.

Biochemistry (English: biochemistry, also known as biological chemistry) is a natural science discipline that studies chemical processes in living organisms, often referred to simply as biochemistry. It mainly studies the structure and function of various components in cells, such as proteins, sugars, lipids, nucleic acids and other biological macromolecules.

It is a sub-discipline of biology, which is a basic life science that studies the chemical composition and structure of living substances and various chemical changes in the process of life activities. Biochemical research began in 1883 with the discovery of the first enzyme, amylase. The term "biochemistry" has been in use since 1882, but it was not widely used by the German chemist Carl Neuberg in 1903.