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1. cell adhesion can often be blocked in vitro by treating cells with specific agents. Which of the following substances would be expected to interfere with cell adhesion mediated by selectins? with cell adhesion medaited by L1 molecules? The substances are trypsin, which digests proteins; a peptide containg RGD; neuramainidase, which remves sialic acid from an oligosaccharide; collagenase, which digests collagen; hyaluronidase, which digests hyaluronic acid; EGTA, which binds Ca2+ ions in the medium.
2. suppose you found that molecule A, which had a molecular mass of 1500 daltons, was able to penetrate the channels of a gap junction, but molecule B, whose molecular mass was only 1200 daltons, was unable to diffuse between the same cells. how might these molecules be different so as to explain these results?
3. Propose some mechanism that might explain how tobacco mosaic virus was able to alter the permeability of a plasmodesma. How might you be able to test your propsal?
What is the value for the concentration of calcium in the cytoplasm of most of your cells.
A male and a female are each heterozygous for both cystic fibrosis (CF) and phenylketonuria (PKU). Both conditions are autosomal recessive, and they assort independently.
Normal winged individuals initially make up 84% of the island population and 64% of the mainland population. What proportion of the island population will have normal wings after one generation.
Because the rate of evolution depends on the number of new mutations, which is directly proportional to population size, and the probability of fixation of a new mutation, which is inversely proportional to population size.
The effects of water loss on the water budgets of lactating female mammals in arid environments are not well understood. Specify a hypothesis regarding mechanisms by which females might prevent water losses in their milk from forcing them into neg..
Describe how the hypothalamus controls secretion from the pituitary gland. Be specific regarding circulation and communication between the two regions.
What are the different types of sugars? What is the difference between inorganic and organic compounds?
For NaCl, which MWCO membrane(s) offered for the net movement of water without the movement of NaCl? For glucose, which MWCO membrane(s) offered for the net movement of glucose without net movement of water?
Examine the anatomical structure of ten different organelles in the cell and their respective functions and Analyze five different types of connective tissue with examples of functions and location within the body.
Assume you have isolated a decapeptide called fighting illini which has anticancer activity. Determine the sequence of the peptide from the data.
What cell types are derived from myeloid versus lymphoid progenitor cells? Describe the function of each WBC type.
Discuss and explain the cis and trans acting regulatory elements and give examples of each?
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