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Pollinia and Massulae
In most cases the pollen grains of each tetrad become separated from one another and they lie freely in the pollen sac. In some plants, mostly members of Ericaceae, the pollen grains remain in tetrads even when mature. In certain plants, such as Acacia, the tetrads are stuck together as groups, which may contain as many as 64 pollen grains. In some other plants, such as members of the Asclepiadaceae, all the pollen grains of a sac are united in a single compact mass such a mass is termed a pollinium. In some members of the family Orchidaceae the anthers produce groups of pollen grains which are loosely jointed among themselves, usually by means of viscin threads. These groups are called as massulae.
Meselson and Stahl demonstrated that DNA replication is a semi-conservative process. Which of the following best explains the definition of "semi-conservative"? A. The two stra
Exon are those parts of a genomic DNA sequence which will be represented in final, mature mRNA t A contiguous segment of the genomic DNA which codes for a polypeptide in the gene.
Q. What are the few examples of the control and informative function of organic molecules? Based on genetic information, organic molecules control the entire work of the cell. D
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Characters of vitamins: Vitamins are organic substances. They are micronutrients and are required in small quantities. They are not synthesised in the body and therefo
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