Answer:
A
Explanation:
Less pollution means less greenhouse gasses being emitted.
Answer:
DNA may be taken up by bacterial cells and be active.
Explanation:
To understand Avery, MacLeod, and McCarty's experiment, it is important to know Frederick Griffith's precursor experiment. The microbiologist worked at the British Ministry of Health's Pathology Laboratory with pneumococci (commonly known as the bacterium Streptococcus pneumoniae, then known as Pneumococcus, which causes pneumonia), which were previously classified into several types. When cultured in petri dishes in the laboratory, the pneumococci that synthesize their capsules generate 'smooth' colonies. Subcutaneous injection of liquid culture of these pneumococci into mice causes their death. However, in vitro culture also allows the emergence of rough colonies', whose bacteria have lost the ability to synthesize mucopolysaccharide (and therefore have no capsules). Rough mutants could no longer be classified with sera and, moreover, lost their virulence: mice inoculated with them remained alive, unlike inoculated with smooth pneumococci.
The nature of Griffith's transforming principle remained unclear until the work of Avery, MacLeod, and McCarty. They repeated the in vitro transformation of pneumococci at the Rockfeller Institute for Medical Research, but replaced heat-dead cells with a purified fraction of smooth bacterial extract (unable to cause disease alone) and treated the material with different enzymes, each capable of destroying a specific type of macromolecule. Experience has shown that this fraction retained its transforming capacity when treated with protein or RNA degrading enzymes, but lost that ability when treated with DNA degrading enzymes. These results indicated that the chemical nature of the 'transforming principle' was DNA.
Thus, we can conclude that in addition to identifying genetic material, Avery, MacLeod and McCarty experiments with different strains of Streptococcus pneumoniae demonstrated that DNA can be absorbed by bacterial cells and be active.
Answer:
prezygotic
Explanation:
According to my research on the maggot flies breeding process, I can say that based on the information provided within the question the inability to breed in the wild is an example of prezygotic reproductive isolation. Like mentioned in the question this is basically any kind of mechanism that prevents fertilization from occurring.
I hope this answered your question. If you have any more questions feel free to ask away at Brainly.
I say the correct answer would be: organism.
Answer:Opium poppy. Essential for the pain killing cancer drug morphine, but infamous as the source of heroin and the addiction it causes.It drove the Anglo-Sino Opium Wars in the mid-1800s where opium addiction was promoted to gain commercial trading advantages.
Yam. ...
Tobacco. ...
Quinine. ...
Rice. ...
Rubber. ...
Cotton. ...
Cannabis.
Explanation:
