Mechanisms of Speciation New examples of sympatric speciation revive some nagging ... in Systematics and the Origin of Species in 1942, and that's how Mayr still sees it today. ... He remains quite seriously dedicated to his view of the world.
Because the water inside of the pipes start to freeze, which means the water is expanding inside the pipe, creating a great amount of pressure, and causing the pipe to burst.
Answer:
B
Explanation:
Fusing both molecules would create a blast of energy not even the atoms can withstand so they explode but implode at the same time.
Answer: The best way to know is to differentiate between types of plasmids whether or not this resistance is due to a single shared plasmid with all three resistance genes.
Explanation:
By way of definition, a plasmid is a small, circular piece of DNA that is different than the chromosomal DNA, which is all the genetic material found in an organism’s chromosomes. It can replicate on their own by using chromosomal DNA. Plasmids are mainly found in bacteria, but can also be found in archaea, multicellular organisms. Plasmids usually carry at least one gene, and many of the genes that plasmids carry are beneficial to their host organisms. Plasmids have separate genes from their hosts, they are not considered to be independent life.
Therefore in a hospital where there has been an outbreak of several species of bacteria, each carrying resistance to three drugs (streptomycin, gentamicin, and penicillin), one of the type of plasmids that shows this resistance is called resistance plasmids or R plasmids.
Resistance or R plasmids contain genes that help a bacterial cell defend against environmental factors such as poisons or antibiotics. Some resistance plasmids can transfer themselves through conjugation. When this happens, a strain of bacteria can become resistant to antibiotics. For example, gonorrhea or tuberculosis infection has become so resistant to a class of antibiotics called quinolones that a new class of antibiotics, called cephalosporins, has started to be in use. The bacteria may even become resistant to these antibiotics within five years. It is important to know that overuse of antibiotics to treat other infections, like urinary tract infections, may lead to the proliferation of drug-resistant strains.