About 350,000 plant species are currently known. Of this total, over 250,000 are angiosperms. The word angiosperm comes from the Greek angeios, meaning 'purse', and sperma, 'seed'. These plants represent the most varied group of species among the components of the kingdom Plantae or Metaphyta.
Increasing drug use has become a matter of concern. The vast majority of people enter this dangerous path without any knowledge of the serious problems that lie behind some moments of apparent well-being and euphoria. It is imperative to open this discussion in the classroom, seeking to enlighten people so that they can consciously and definitively say no to drugs: “Drugs: I'm out, I like me better”. Ecstasy The most commonly used is ecstasy, or simply "E", also known as the "love pill".
There is a correspondence between Mendel's readings and meiosis. Follow in the figure the process of formation of gametes of a cell of individual dihybrid, relating it to the 2nd Law of Mendel. Note that during meiosis, the homologs align in metaphase and their separation occurs at random, in two equally viable possibilities.
Just as in one train each wagon is engaged to the next, in one protein each amino acid is linked to another by a peptide bond. By this bonding, the amino group of one amino acid joins the carboxyl group of the other, releasing a molecule of water. The two joined amino acids form a dipeptide.
Viruses are beings that do not have cells, they are constituted by nucleic acid that can be DNA or RNA, surrounded by a protein envelope called capsid. They are about 0.1µm in diameter, with dimensions only observable under the electron microscope. Because they are so small, they can invade cells, including unicellular organisms such as bacteria.
Set of all living beings that interact in a certain region and may be called biocenosis, community or biota. As we have seen, according to the way food is obtained, the community of an ecosystem is generally made up of three types of beings: Producers: the chemosynthesizing (bacteria) and photosynthesizing (bacteria, algae, and vegetable) beings.