Yes people are trying to plant more trees and promote awareness on afforestation and some have even started making rules the 'clean air act'
<h2>A) option is correct </h2>
Explanation:
RNA processing involves 5'capping,splicing,polyadenylation and RNA editing
1) 5'capping
- It is the first modification event in the pre mRNA that occurs after 20-30 nucleotide addition
- In capping a 7 methyl guanosine(cap) is added to the 5' end of pre mRNA
- Capping protects 5'end of pre mRNA from degradation by exoribonucleases and facilitate transportation form nucleus to cytoplasm
2) Splicing
- Splicing is the second modification event of pre mRNA and occurs in nucleus just after transcription but before the RNA moves to the cytoplasm
- In RNA splicing non coding regions of pre mRNA called introns are removed and coding regions called exons are religated
3) Polyadenylation
- Most of mature RNA have 50-250 adenine residues at the 3'end called Poly A tail
- These nucleotides are not encoded by the genome but are added after transcription,process is called polyadenylation
- Polyadenylation is both template and primer independent process catalysed by polyadenylate polymerase(PAP)
- PAP uses ATP as a precursor and adds the nucleotides using same chemistry as RNA Polymerase
- Poly A tail protects mRNA from exonucleases at 3' end
4) RNA editing
- RNA editing is defined as changing of nucleotide sequence of RNA resulting mature RNA differs from which encoded by genomic sequence
- RNA editing is carried out in two different ways:
- Site specific base modification RNA editing is the one in which deamination of cytosine and adenine are common types of modification
- Insertional or Deletion type of RNA editing is the one which is more common where uridine is inserted or deleted from specific region after transcription
Answer:
Explanation:
Bone marrow is a semi-solid tissue which may be found within the spongy or cancellous portions of bones. ... It is composed of hematopoietic cells, marrow adipose tissue, and supportive stromal cells. In adult humans, bone marrow is primarily located in the ribs, vertebrae, sternum, and bones of the pelvis.
hope this hepls
Answer:
During passive transport, substances travel with the concentration gradient.