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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?
show herneation of the tonsils of the cerebellum into which anatomic space.
The breakdown of complex glycogen molecules into simple glucose molecules is most accurately described as a anabolic reaction.
If the hernia allele in Belgium terriers has a frequency of 0.09, what is the probability that a puppy you buy will develop this problem (the problem is expressed by the homozygous recessive condition hh)?
List the different hypothalamic regions and peripheral signals involved in the control of feeding and satiety.
Which of the following statements is true? The first cervical vertebra is called the axis.The spinal cord protects the vertebral column.
Which are the three stages for identification of coliforms in a water sample? Can you confirm the presence of coliforms at each stage? Why or why not?
Recessive mutant alleles of an x-linked gene in Drosophila, crossveinless, prevent the development of supporting structures in the wings.
what is the most prevalent nematode in humans in the U.S.A.? A) NAECATOR americanus B) Dictyocaulus filaria C) Uncinaria lucasi D) Enterobius vermicularis E) Loa loa
a round pea seed is germinated, and the mature plant is allowed to self-fertilize. it produces some wrinkled seeds. what was the genotype of the original seed? what is the expected proportion of wrinkled seeds produced by the mature plant?
The BBC carried the following posting on its web site of 13th October 2011. "Alongside the obesity strategy, ministers also announced new recommended levels of energy intake following a review by advisers.
Suppose that you conducted a tissue fractionation and that you collected aliquots at each step. Suppose that in step one you suspended tissue in 100 ml buffer then homogenized the tissue.
Describethe results, in the context of the rate of electron flow through the thylakoid membrane, and is the light saturation effect taking place, based on my results.
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