Hi
Mutations are responsible for increasing the antibiotic resistance of some bacterial strains.
As we know that antibiotics are the drugs that target specific strain or type of bacteria, and kill them. These are designed against specific disease causing gene of that bacteria strain. However, as the genome of bacteria is very small in size, and bacteria undergo hundreds of multiplication events in very small span of time. Therefore, upon replicating, there occur chances of mutations in genetic sequence of bacteria.
When the genetic sequence of bacteria is changed even by one base, the drug wont be able to target and kill that strain of bacteria. And researchers need to design new antibiotic against new strains of bacteria.
Antibiotics resistance has become huge issue across the world as it takes alot of time (years) to design and approve an antibiotic.
Hope it help!
The correct answer is letter A. Venom glands and varied diets are the reasons why cane toads are considered as invasive species in Australia. They cause major ecological imbalance within their immediate surroundings and have caused an infestation all over Australia.
Answer:
Explanation:
question 1
the resulting imbalance between incoming solar radiation also outgoing thermal radiation most likely causes the earth to heat up over the next 10 years.
question 2
much like a conveyor belt, transporting warm water and precipitation from the equator making the cold water from the poled back to tropics
question 3
greenhouse gasses trap more and more energy from the sun, oceans are absorbing the heat at a slower rate.
question 4
climate change due to human activity had a direct impact on marine species
