I2KI is used to test for the presence of sugars
a. True
b. False
b
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When someone has cataracts, they may be able to have a surgical replacement of their cloudy lens with an artificial lens. The artificial lens implant will be clear, but it is also fixed in shape. Based on your knowledge of vision, would it usually be necessary to get a new prescription for their glasses following this surgery?
A. Yes, the artificial lens will be fixed, so it cannot give distance vision one moment and near vision the next. B. No, they would no longer need glasses after lens replacement surgery because a new lens would not need correction.
Southern blot is a method for ____
a. amplifying DNA segments using cycles of denaturation, annealing to primers, and DNA polymerase-directed DNA synthesis b. transferring DNA fragments from a gel to a membrane filter and used in hybridization experiments c. determining the nucleotide sequence of a DNA molecule d. producing several clones from a single cell by placing the cell in a Petri dish and allowing it to go through several divisions e. detecting mutant genes or differences in the pattern of gene expression
Evidence suggests that factors which contribute towards the virulence of E. coli strain O157:H7, a bacterial strain reported to cause several food poisoning deaths, are caused by genes from a virus that infects bacteria
Considering this evidence, which statement most likely explains how the O157:H7 population acquired the genetic variation that distinguishes the strain from harmless E. coli strains, such as those that reside in our intestines? A) The virus entered the bacterial cell and incorporated its DNA into the bacterial genome, allowing the bacteria's cellular machinery to create new viruses. B) Viral envelope proteins bind to receptors on the bacterial membrane, allowing the viral genetic material to enter the bacterium and become translated into proteins. C) The virus entered the cell and acquired specific genes from the bacteria to increase the virulence of the virus. D) The virus infected the bacterium, and allowed the bacterial population to replicate with a copy of the phage genome in each new bacterium.
Small molecules diffuse through the cytosol very efficiently by doing which of the following?
A.) binding to larger moleules B.) taking the shortest path from one location to another C.) forming noncovalent bonds with other molecules D.) migrating along cytoskeletal microtubules E.) moving randomly, knocked around by colliding with other molecules