Telomerase activity is controlled during development and is extremely low in somatic (body) cells, virtually undetectable. These somatic cells age because they do not frequently use telomerase.
- Telomeres are repetitive sections at the very ends of chromosomes that are present in a variety of eukaryotic species, including humans and unicellular protists.
- Each round of DNA replication wears down a little portion of the telomeres, which serve as caps to safeguard the interior chromosomal regions.
- Most somatic (body) cells do not typically have telomerase activity, but certain adult stem cells and germ cells—the cells that produce sperm and eggs—have.
- Adult germ cells, tumor cells, and fetal tissues all contain telomerase. Telomerase activity is controlled during development and is extremely low in somatic (body) cells, virtually undetectable. These somatic cells age because they do not frequently use telomerase.
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Seafloor spreading can stop during the process, but if it continues to the point that the continent is completely severed, then a new ocean basin is created. Your answer No
Answer: MONOCOT
1) seeds with one cotyledon.
2) the plants have fibrous root system
3) leaves have parallel venation
4) the petals of flowers are trimerous(3 petals)
DICOT
1) seeds with two cotyledon.
2) the plants have taproot system.
3) leaves have reticulate venation
4) the petals of flowers are pentamerous (5 petals)
Explanation:
Genome
Explanation:
The genome of an organism is the summation of all the genes in the cells that hold information on how the organism is built and maintained. In higher organisms, the genome also contains non-coding regions that also play a significant role in the cells such as ensuring the integrity of chromosome ends. The genome of a human being is composed of approximately 3 billion base pairs.
The genome of organisms may not necessarily be found in the nucleus of cells, especially in eukaryotes, but in addition can be found even in membrane-bound organelles like the mitochondria and chloroplast.
Learn More:
Learn about the human genome project;
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