Antibiotic resistance is a consequence of evolution via natural selection. The antibiotic action is an environmental pressure; those bacteria which have a mutation allowing them to survive will live on to reproduce. They will then pass this trait to their offspring, which will be a fully resistant generation.
Answer:
Option (A) and (C).
Explanation:
Gene regulatory mechanism are important for the regulation of the transcription and proper expression of genes. Different regulatory mechanisms are present in prokaryotes and eukaryotes.
The prokaryotes do not require the multiple general transcription factors where as the eukaryotes have different transcription factors like TFIID, TFIIH and TFIIA. The DNA is packed around the histone protein that form chromatin in eukaryotes. The chromatin packaging includes methylation, ribosylation with the help of enhancers and silencors. The chromatin is absent in case of prokaryotes.
Thus, the correct answer is Option (A) and (C).
Answer:
the answer u selected is right :)
Explanation:
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Fault-block mountains are formed by extensional stresses.
Explanation:
- Fault-block mountains are formed because of extensional stresses. They are also called tension stresses.
- These stresses pulls and stretches rocks apart which causes normal faults to form.
- The normal fault cuts through rocks, causing one to slip downward and one to move upward. Thus, fault-block mountains are formed.
- Sierra Nevada in California and Nevada is an example of a fault-block mountain.
Answer:
There are also various direct methods of preventing landslides; these include modifying slope geometry, using chemical agents to reinforce slope material, installing structures such as piles and retaining walls, grouting rock joints and fissures, diverting debris pathways, and rerouting surface and underwater drainage.
Explanation: