Genetic engineering is the direct manipulation of a specific gene. I would use it in this scenario
Answer:
Frederick Griffith was the first scientist who discovered that cell contains some components that can be transferred to another cell and cause a permanent change(transformation) in the new cell.
To prove this he performed an experiment in which he took two strains of <em>Streptococcus pneumoniae</em> which contain one rough strain and one smooth strain. Rough strain was non-virulent strain and smooth strain was virulent strain.
So he injected smooth and rough strain in mice and saw that mice die when virulent strain is injected and survive when non-virulent strain is injected. Then he injected heat killed virulent strain in which mice survived.
Then he added remain of heat killed bacteria with live smooth strain of bacteria and infected the mice and saw that the mice was killed by non-virulent smooth strain of streptococcus.
After this experiment he concluded that cells contain some component later identified as DNA which can be transferred to new population of cells and transform these new cells.
Answer:
White blood cells.
Explanation:
The first line of defence (or outside defence system) includes physical and chemical barriers that are always ready and prepared to defend the body from infection. These include your skin, tears, mucus, cilia, stomach acid, urine flow, 'friendly' bacteria and white blood cells called neutrophils.
Answer:
D
Explanation:
Fire is man made because for there to be fire you have to strike a match or use other man made sources
<span>This is because, people, generally,
have two kidneys and are also able to function properly with one functional
kidney. Therefore it is easier to perform kidney surgery without putting the patient’s
life at risk as compared to heart surgery. Everyone has one heart, a critical
organ whose surgery has to be well planned and done only if the risk of
not doing the surgery outweighs that of doing the surgery. </span>
