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Which piece of evidence below (a-d) best supports the hypothesis that protein structure and function are correlated? a) Denatured proteins can be renatured under the appropriate conditions. b) An enzyme can catalyze a reaction at 37 °C but cannot catalyze the same reaction at 42° C. c) Enzymes can consist of protein or RNA. d) When the primary structure of an enzyme is altered its quaternary structure is always altered. You isolate a nucleic acid from a cell. How do you determine whether you have isolated DNA or RNA? a) Look for the phosphate groups. b) Look for double stranded portions in the two molecules. c) Look at the presence of carbon in the molecule. d) Look at the hydroxyl groups on the 3' carbon of the sugar. e) Look at the pyrimidine content.
Think about an enveloped virus fusing with the plasma membrane. If fusion can not be triggered by low pH because the plasma membrane is neutral,
Illustrate the structures of the sun including the interior, surface and atmosphere and what type of science is done to come to these conclusions. How does the structure of the sun compare to structure of the earth.
A sea urchin egg is used in a voltage clamp experiment; that is, the value of the transmembrane voltage is set by the experimenter, not by the properties of the membrane.
According to our current knowledge of plant evolution, which group of organisms should feature mitosis most similar to that of land plants.
Describe and discuss the difference between heme and nonheme iron. How can the efficiency of absorption be increased for both types of iron?
The pUC series plasmid contains LacZ gene with multiple cloning site. Suppose if you insert a piece of DNA into this LacZ gene, how will you tell which one is your recombinant.
Reverse transcriptase might be present in cells that have not been infected by a retrovirus since of the presence of what.
Explain how a feedback system maintains homeostasis and Design an experiment to test the hypothesis that Drug Y lowers cholesterol in humans. Include all the steps in the scientific method.
For each of the E. coli strains given below, estimate the effect of the genotype on expression of the trpE and trpC genes in the presence and absence of tryptophan.
Explain especially what happens to DCPIP and why and how. Explain results and purposes of each of the four tubes of solutions where the photosynthetic output of the Hill reaction was measured.
The prothalli are bisexual, free-living and photosynthetic. At maturity, the prothallus is flat and heart-shaped. Inspect the lower surface for rhizoids, antheridia and archegonia. What is the function of each of these structures.
A corn plant is homozygous for a mutant allele that results in no pigment in the seed. The mutant is caused through Ds insertion that often exits late in the seed development,
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