Cholera develops when the bacterial toxin prevents G-protein inactivation , which leads to the continuous production of cAMP.
Answer:
True
Explanation:
The sympathetic autonomic nervous system activates the body for hormonal or neuronal responses also known as fight- or - flight response, For example during an fire emergency and there is a need to run. The response occurs primarily by via impulses transmitted through the sympathetic nervous system, and also secondarily through catecholamines secreted from the adrenal medulla.
Although the sympathetic autonomic nervous system is activated in stressful conditions, it needs to be constantly active even at a basal level to maintain homeostasis.
Answer:
4
Explanation:
Codons describe the triplet sequence of bases present in an mRNA that code for proteins. They do this by specifying specific amino acids.
To answer this question, we need to know the genetic code. This can be found in various formats (usually tables) online or in textbooks. An example is attached.
Threonine is an amino acid with the three letter code Thr, and the one letter code T.
As you can see in the table, 4 codons (ACU, ACC, ACA, ACG) code for threonine
<h2>
Answer:</h2>
- Deforestation.
- Overexploitation.
- Pollution.
- Climate change.
- Invasive species.
<h2>
Explanation:</h2>
- <u>Deforestation:</u> in simple words means clearing of forests for man use such as for making wood fuel, furniture,papers and land land for civilization etc. but these forests plays important role as they are home for most of the world's biodiversity. For example, in the Amazon around 17% of the forest has been lost in the last 50 years, and amazon forest are also known as lungs of planet earth as it produces the maximum amount of oxygen.
- <u>Overexploitation: </u>basically means harvesting species from the wild at rates faster than natural populations can recover. Over-fishing, over-hunting both are type of overexploitation.
- <u>Pollution: </u>it can be of various types such as air, water, noise pollution etc. these are serious threat to biodiversity, but in particular nutrient loading into land and water sources, primarily of nitrogen and phosphorus, which is a major and increasing cause of biodiversity loss.
- <u>Climate change:</u> Its consequences are one of the most important threats to biodiversity and the functions of ecosystems.It includes temperature increases, shifts of climate zones, melting of snow and ice, sea level rise, droughts, floods, and other extreme weather events. Natural systems are vulnerable to such changes due to their limited adaptive capacity.
- An<u> invasive species</u> is defined as an "Alien species" which means species added to a particular region without their natural existence whose introduction does or is likely to cause economic or environmental harm. Invasive species are one of the major threat to our environment because they (1) as they can change habitats of other species and can also alter the ecosystem function. (2) they can crowd out or replace native species(species residing their naturally) (3) damage human activities, costing the economy.
Result: Above are the common threat for biodiversity.
