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An invesigator isolates chloroplasts from spinach cells and suspends them in the dark in a tube containing a pH 4 buffer for about 60 seconds. These chloroplasts were then injected in the dark into a second tube buffered at pH 8 along with substqances needed to make radioactive ATP. What happens and what does the experiment demonstrate?
Is it possible for one kind of neurotransmitter molecule to have an excitatory effect at one cell, and an inhibitory effect at another? Explain using an example.
Draw a dichotomous key that distinguishes the remaining bacterial phyla, Planctomycetes, Chlamydiae, Spirochaetes, Bacteroidetes, and Fusobacteria.
Inorganic fertilizers contribute to water pollution and your town is encouraging its citizens to switch from inorganic fertilizers to organic fertilizers, like seaweed powder, so as to minimize pollution.
What other diseases are thought to be caused by the point mutations? What do point mutations do in those diseases.
Serial dilutions are not only for bacteria. They can be used for any reagent. Suppose that in an experiment it is necessary to add 0.01 micro grams of DNA to a tube. Suppose that the concentration of DNA you have is 1 mg/ml.
Use the pKa of p-nitrophenyl (7.0) and the henderson hasselbalch equation to correct the concentration, since at pH 7.8 not all of the product is in the colored, visible form. Use 18,380 M^-1cm^-1 for the extinction coefficient.
Mimulus lewisii and Mimulus cardinalis are two plants that occupy the same habitat but do not interbreed in nature. Though, they can be readily crossed in the laboratory to produce fertile offspring. Which is a likely reason that prevents interbreedi..
A new chemotherapeutic agent is developed that alters structure of all thymines in DNA. These thymines are then misread during the production of mRNA.
Consider a genetic disorder in which healthy allele mutates to a recessive deleterious one with a rate of 10^-8, and the fitness cost is a reduction of the fitness by 25%.
How several bacteria were on the soap? How did they get there. Unlike squamous cells, cuboidal and columnar cells have large, open cytoplasms. Which functions of epithelial tissue are supported by having such big cells.
A bacterial cell is suddenly expelled from a warm human intestine into the cold world outside. What types of adjustments (with respect to the phospholipid content) might the cell make to maintain the same level of membrane fluidity?
For an enzyme (5 µM) , the following initial velocities have been reported depending on the substrate concentration.
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