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In at least single eukaryote, Tetrahymena, the pre-rRNA molecule holds an intron. Erasing of the intron in running processing of the pre-rRNA does not require the assistance of any protein! Instead, in the presence of guanosine, GDP, GMP or GTP, the intron excises itself is a phenomenon known as self- splicing. This was the first expression of ribozymes, which is, catalytic RNA molecules which catalyze particular reactions. The Self-splicing introns have also been discovered in some eukaryotic mRNAs and even peptidyl transferase a main activity in protein synthesis is now known to be a ribozyme.
A fruit fly has four pairs of chromosomes in its cells. At meiosis, how many dissimilar combinations of maternal and paternal chromosomes are possible in the gametes? In gamet
economic importance of viruses and bacteria ?
Q. How does the CD4 counting act to monitor the HIV infection? What is another laboratory method to follow up the disease? The CD4 counting test is complete from a blood sample
Explain some Precautions for Preparation of Chloride Buffers? 1. Glass electrodes should always be before and after measuring pH with a tissue paper. 2. The pipettes should
PHYLUM PLATYHELMINTHES Definition and Introduction Bilateral and protostominal organ grade eumetazoans without a body cavity ( acoelomates) platyhelminthes means fl
Q. Which are the target tissues and target organs of the neurohypophysis? The target organs of oxytocin are the mammary glands and the uterus and target organs of ADH are the k
How ecosyestem concept is useful to the study of environment?
Is the effect of genetic drift likely to be the same in pop 1 and pop 2? How are genetic drift and pop size related? When there is strong selection against the homozygous recessive
Annelids - Hormones in Growth and Reproduction Studies on polychaetes have displayed that the endocrine glands play a key role in growth and reproduction. In addition to the b
The fusion of two individuals with each acting as a gamete is known as
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