It may consist of atoms of a single chemical element, as with oxygen (O2), or of different elements, as with water (H2O). As components of matter, molecules are common in organic substances (and therefore biochemistry) and are what allow for life-giving elements, like liquid water and bre...
Diatomic molecules are when only two atoms combine. An example of adiatomic moleculeis carbon monoxide (CO) made of a single atom of carbon and one of oxygen. If the two atoms are the same element, it is called ahomonuclear diatomic molecule, such as oxygen (O2) and nitrogen (N2).Poly...
The chain began with the simple molecules found in the early cloud dusts, and culminated with the building blocks of life from which life on Earth first sprang. The chain leading to life.这条链条从早期云尘中发现的简单分子开始，到形成生命的基石，地球上的生命就是从这些基石开始萌芽的。一条生命...
Japanese researchers traced the odor to a chemical compound (化合物) called 2-nonenal. The compound is a byproduct of other chemical breakdowns and sends out a “greasy” or “grassy” odor as the molecules (分子) exit...
Macromolecules are large molecules known as polymers that are composed of repeating subunits known as monomers. There are four classes of macromolecules that perform a variety of tasks and functions for the maintenance of cells and biological life....
Chemistry is helping us figure out how life got started on Earth and is giving us molecules to look for on other planets. In this episode ofReactions, we break down what “life” is and how likely we are to find it out in the cosmos. ...
Molecules(微粒) found on phones reveal lifestyle secretsWhat does your phone say about you? Molecules found onmobile phones reveal an astonishing amount about the owner's healthand ifestyle-including ther food preferences and medication.Californian scientists found traces of everything from caffeineand...
Information—that is atoms, molecules, cells, organisms, societies—is self-obsessed, constantly looking for meaning in the mirror, like Narcissus looking at the reflection of the self, like the molecular biologist’s DNA playing with itself under ...
Nucleic acids are the molecules that contain and help express a cell's genetic code. There are two major classes of nucleic acids: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA is the molecule that contains all of the information required to build and maintain the cell; RNA ha...
Earth is the planet of life. Running, crawling or flying, life abounds everywhere.地球是一个满是生命的星球。奔跑着的、爬行着的或飞翔着的，到处都是生命。But for all this beautiful diversity to have proliferated, Earth has had to provide a favourable environment for around four billion years. ...