Answer:
Because the promoter region is initiation sites for transcription to occur.
Explanation:
Transcription is the first process of gene expression in both eukaryotic and prokaryotic cells. Transcription involves the synthesis of a complementary RNA strand from a DNA template. It is carried out by an enzyme called RNA polymerase which binds to the DNA molecule and adds nucleotides based on the sequence it reads on the DNA.
On the DNA molecule, are sequences of nucleotides which the RNA polymerase recognizes and binds to in order for the transcriptional process to start. These sequences are called PROMOTER regions. They are located upstream i.e. after initiation site, of the DNA. Without these promoter region, RNA polymerase cannot bind to the DNA molecule and hence transcription cannot occur.
1) Lipids are the waxy, greasy, oily molecules found in the body.
2)They are water-insoluble (hydrophobic), and this property is useful in the organisation of cells and tissues.
3)Lipids can be extracted from cells using non-polar solvents . Example chloroform or benzene.
Proteins are important biomolecules. Proteins are synthesized and often packaged for secretion into other cells within an organism. A variety of organelles play a role in producing, packaging, and moving proteins.
Organelles of Eukaryotic Cells
Organelle Function
Nucleus The “brains” of the cell, the nucleus directs cell activities and contains genetic material called chromosomes made of DNA.
Mitochondria Make energy out of food
Ribosomes Make protein
Golgi Apparatus Make, process and package proteins
Answer:
#1 - Habitat destruction renders entire habitats functionally unable to support the species present; biodiversity is reduced in this process when existing organisms in the habitat are displaced or destroyed. The primary cause of species extinction worldwide is habitat destruction
#2 - All forms of pollution pose a serious threat to biodiversity, but in particular nutrient loading, primarily of nitrogen and phosphorus, which is a major and increasing cause of biodiversity loss and ecosystem dysfunction. In addition, nitrogen compounds can lead to eutrophication of ecosystems.
#3 - Invasive species can harm both the natural resources in an ecosystem as well as threaten human use of these resources. Invasive species are capable of causing extinctions of native plants and animals, reducing biodiversity, competing with native organisms for limited resources, and altering habitats.
#4 - Overexploitation means harvesting species from the wild at rates faster than natural populations can recover. Two birds that were victims of overhunting are passenger pigeons and great auks (a type of bird). Both were hunted to extinction.
#5 - The core threats to biodiversity are human population growth and unsustainable resource use. To date, the most significant causes of extinctions are habitat loss, introduction of exotic species, and overharvesting. ... Habitat loss occurs through deforestation, damming of rivers, and other activities.