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Describe the activity of the bacterial lac operon when glucose it present and when it is not present (include whether or not lac operon genes are expressed and why) also include points a, b, and c below;(a) Why does lactose act as an inducer? (b) What is the significance of CAP and how does it work? (c) How does the repressor work?
List and describe at least three cellular features of bacteria that could be targeted to inhibit or kill bacterial pathogen. Which is a significant flaw in this experimental set-up.
Compute the ratio of molecular weights of 60S and 40S ribosomal sub-units assuming that sub-units have spherical shape and the same density.
During interphase the DNA is not visible through a microscope; it only becomes visible as chromosomes during mitosis. Why isn't the DNA visible during interphase and why would this be the case?
ndicate with an arrow the direction that DNA Polymerase would elongate the "primer" DNA strand on this double-stranded DNA molecule in the presence of dNTPs.
When you eat a salad with lettuce, croutons, hard-boiled egg, bacon bits, and salad dressing, which one of those components will break down the least as it passes through your digestive system? Why?
Organisms on the planet Uglantis, that orbits distant star, have metabolism remarkably similar to that in organisms on Earth with a few exceptions.
Suppose when increasing magnification from high dry to oil immersion, should the iris diaphragm be open or closed? How is this done?
Every cell in the human body has two alleles that condense into single chromosomes held together by a centromere. These "sister" chromaatids replicate and pair with the newly made homologous chromosomes.
How denaturing a protein alters the functions of that protein. If we are bleeding by the accident, why the injury has to be deeper than epidermis.
a+, b+, c+ and d+ are independently assorting Mendelian genes controlling the production of a black pigment. The alternate alleles that give abnormal functioning of these genes are a, b, c, and d.
The hypothetical OxyA protein is a surface protein that may have a role in attachment to the surface of the intestinal epithelium but there is evidence that it has a role in invasion. Write the structural formula for isoamyl alcohol.
Genes for color blindness and hemophilia are linked on theX-chromosome in humans with a recombination frequency of 30 %. Awoman whose father was a color blind hemophiliac and mother wasnormal with no history of color blindness and hemophilia wants..
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