The rigid layers of fungal cell walls contain polysaccharides called chitin and glucans. The wall protects the fungus from desiccation and predators. Most fungal hyphae are divided into separate cells by endwalls called septa(e). These tiny holes in the septa allow the rapid flow of nutrients and small molecules from cell to cell along the hypha.
A Intron is a segment of a DNA or RNA molecule which does not code for proteins and interrupts the sequence of genes. A exon is An exon is any part of a gene that will encode a part of the final mature RNA produced by that gene after introns have been removed by RNA splicing. Hope this helped:)
<h2>Development of Plant Needles</h2>
Explanation:
- Seed of pitch pine treated with colchicine delivered tetraploid seedlings which had thick and sporadic needles and less fortunate tallness and diameter growth than ordinary seedlings.
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In test of colchicine-initiated polyploidy in pines, researcher found that a significant number of the polyploid plants returned to a diploid development in light of the fact that the polyploid cells partitioned at a more slow rate and were overwhelmed by the more quickly developing diploid cells which encompassed them.
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The primary needles of both diploid and polyploid plants were more effective at low light intensity than secondary needles, and they had lower compensation points.
The correct answer is D. Mutation causing uncontrolled cell division.
Mutation is termed as the alteration of sequence of nucleotides which is permanent to organisms or extrachromosomal DNA or virus.
During DNA replication mutation may result from different errors. For example, during meiosis we can say that the result of mutation can be harmful if mutation can change proteins which are being produced by a gene.