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In Luria and Delbrucks classic fluctuation tests, they infected bactia with lytic viruses. Then they found the number of resistant bacteria varied greatly from culture to culture, suggesting that these mutants appeared spntaneously. If luria and delbruck had used lysogenic viruses instead of lytic viruses, how would their results have changed?
Acetylcholine binds this membrane protein, which subsequently opens to allow sodium to enter the cell. Acetylcholine exerts its effect on what kind of transport protein.
q1. trace a drop of blood from tissue cells of the left knee to capillaries of the right arm. be sure to stop at the
For maternal and paternal chromosomes in the humangamete example, what is the probability of a gamete having at leastone maternal chromosome?
Assume i f you are performing in-situ hybridization to detect mRNA, why do you use the antisense strand? Are you using RNA or DNA as a probe for mRNA?
Upon doing a negative stain of unencapsulated gram-negative cells, a small halo will be seen around the cells. Why is this the case? What external structure of a gram negative cell will exclude the negative stain.
What is the biological significance of lacZ gene inbacteria? Briefly explain the appearance of blue vs. white colonies when E. coli is grown on medium containing X-gal during screening for transformants.
An amphibian that lives in a swamp has thirty fold more DNA than a human who lives on the forty-eight floor of luxury apartment apartment complex.
Since L-glucose cannot be metabolized, it has no caloric value. Why is L-glucose not the perfect diet aid? An uncatalyzed reaction has a rate of 4.2 x 10-7 sec-1. When an enzyme is added the rate is 3.2 x 104 sec-1. Calculate the rate enhancement c..
Briefly describe mechanism of regulation of protein kinase A (PKA)by cyclic adenosine monophosphate (cAMP)? What is the primary enzymatic function of PKA?
After Drosophila DNA has been treated with a restriction enzyme, the fragments are attached to plasmids and selected as clones in E. coli. By using this "shotgun" technique, David Hogness recovered every DNA sequence of Drosophila in a library.
q1. most antibacterial drugs disrupt or destroy prokaryotic cellular characteristics that are different from those of
q. in a mutant strain of e. coli a trna that recognizes the codon 5 cug 3 of normal cells has a point mutation so that
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