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A protein that is normally a single-pass transmembrane protein is absent from the cell surface of the mutant cell line YTM-15. When labeled so that the protein can be localized, you find that this protein is now secreted by the cell. Analysis of the amino acid sequence of the transmembrane protein in question reveals sequence changes that could lead to the observed phenotype. The amino acid substitutions lead to alterations in the ER signal sequence and the stop-transfer sequence. In addition, YTM-15 cells exhibit a point mutation in the gene encoding signal peptidase. Only one mutation is consistent with the observed phenotype. What is the underlying cause of the mutant trait? Explain your reasoning.
The aqueous fluid that fills the nuclear region is known as karyolymph, or nucleoplasm. In the fluid there are proteins, enzymes and other significant substances for the nuclear me
Q. Describe Coronary Spasm? Usually spasm develops at the site of subcritical or critical stenoses, but it may also occur in angiographically normal coronary arteries, the so c
Locomotion in Mollusca The major locomotor organ in Mollusca is the foot, which is a characteristic feature of these animals. In its simplest form the foot is a flit ventral
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Apical Dominance Apical dominance is a correlative phenomenon in the developmental biology of plants. Branching of the main shoot into lateral branches is one of the main char
what are the function of nucleus
Types of survivorship curves
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