Answer:
Animal cells have slight differences to the eukaryotic cells of plants and fungi. The clear differences are the lack of cell walls, chloroplasts and vacuoles and the presence of flagella, lysosomes and centrosomes in animal cells. Plant and fungal cells have cell walls
I. treating the substance with nucleases that destroy all nucleic acids and then determining whether it is still infectious
Explanation:
Analysis of the nature of the specimen like the infectious agents (bacterium, virus, viriod, or prion) is very important to diagnose the diseases caused by them, investigate disease outbreak, to determine the clinical course of the infectious disease etc.
There are many methods like direct detection, cultivation assays, serological assays to detect the pathogen type.
Molecular techniques like polymerase chain reaction (PCR) is done to further analyze or investigate the pathogen, like its microbial genome, the virulence factor etc. These are amplification methods which help to investigate the pathogenesis and disease progression. PCR method involves denaturing the DNA polymerase which is a nuclease type of enzyme. Nucleases are present with exonucleases and endonucleases, both of which acts at specific points on the DNA of the pathogen and will create new templates .
Answer:
the answer is c
Explanation:
a thermometer behaves predictably in the presence of heat
Avoiding contact with UV radiation
A theory is an explanation of an aspect of the natural based on careful examination of facts. A theory by its definition can be repeatedly tested. A theory can be changed or replaced because of the following reasons:
New technology is developed that provides more information about the theory. (New technologies can lead to new results).
New experimental methods are designed to test a theory.
New information is discovered that does not support the theory.
