In an experiment to study the effect of ultraviolet light on bacteria, it was concluded that ultraviolet light has a sterilizing
effect on bacteria. Which of these observations could have led to this conclusion? A) Ultraviolet light stopped the replication process of bacteria.
B) Bacterial colonies exposed to ultraviolet light continued to replicate.
Eliminate
C) Bacterial colonies exposed to ultraviolet light became resistant over time.
Answer A) Ultraviolet light stopped the replication process of bacteria.
UV radiation is the mutagen which means it can cause mutation in the genome of the living organisms such as humans, bacteria, virus and other microorganisms. These rays are harmful for bacterial colonies when particularly exposed to wavelength of 260nm to 270nm. These radiations breaks molecular bonds within the bacterial DNA, these radiations results in the formation of thymine dimers which can kill the bacteria.
On the basis of the above description, Ultraviolet light stopped the replication process of bacteria is the relevant option.
In resting state its gated channels are shut; so 95% are trapped inside the interstitial fluids of the axoplasm;Although these channels leak for some to escape down the concentration gradient to the extracellular environments of the axon, most of these ion are concentrated inside the interstitial fluid of the axon to maintain RMP
The geocentric model held sway into the early modern age, but from the late 16th century onward, it was gradually superseded by the heliocentric model of Copernicus (1473-1543), Galileo (1564-1642), and Kepler (1571-1630). There was much resistance to the transition between these two theories.
