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Q1. An experiment is designed to study mechanism of sucrose uptake by plant cells. Cells are immersed in a sucrose solution, and pH of the solution is monitored with a pH meter. Samples of the cells are taken at intervals, and sucrose in the sampled cells is measured. The measurements show that sucrose uptake by the cells correlates with a rise in the pH of the surrounding solution. The magnitude of the pH change is proportional to the starting concentration of sucrose in the extracellular solution. A metabolic poison known to block capability of cells to regenerate ATP is found to inhibit the pH changes in the extracellular solution. Suggest a hypothesis accounting for these results. Propose an additional experiment to test your hypothesis.
Q2. A researcher lyses a cell that contains nucleic acid molecules and capsomeres of tobacco mosaic virus (TMV). The cell contents are left in the covered test tube overnight. The next day this mixture is sprayed on tobacco plants. Which would be expected to happen?
ESI-TOF MS of a protein from a low pH solution generates a series of m/z peaks. The two most dominant successive peaks have m/z values of 510.0 and 502.9.
For silkworms, C represents the dominant allele for a yellow cocoon and c represents the recessive allele for a white cocoon. Draw a punnett square crossing a homozygous dominantparent with a homozygous recessive parent. What percentage of the off..
Cyanobacteria grow prolifically in streams and lakes with low oxygen levels and high nutrient concentrations. How may the presence or absence of cyanobacteria be used as an index of pollution in lakes.
Why is it beneficial to plants that soil particles have negatively charged surfaces.
List examples of things you disagreed with and why in Lewis Thomas Essays "The Lives of a Cell"
The table presents the rates of reaction at specific substrate concentrations for an enzyme that displays classical Michaelis-Menten kinetics. Two sets of inhibitor data are also included.
What were some of the effects of the naturalistic world view upon science? Upon society at large?
Suppose a fire hose ejects a stream of water at an angle of 38.8 ° above the horizontal. The water leaves the nozzle with a speed of 26.6 m/s.
In most organisms, oxygen slows down glycolysis, and pyruvate is directed towards the TCA cycle rather than fermentative pathways this is called the Pasteur Effect.
A 5.0 mL aliquot of a stock tryptophan solution was diluted by adding 95 mL of water. The absorbance of that diluted solution was measured at 280 nm as 0.055 absorbance units.
What are prions? Select one: a. misfolded versions of normal brain protein b. tiny molecules of RNA that infect plants c. viral DNA that has had to attach itself to the host genome d. viruses that invade bacteria e. a mobile segment of DNA
Assuming that the virus capsid is spherical, work with your classmates to calculate what is the maximum genome size (in nucleotides) that can fit into the capsid. How long in millimeters would this largest possible RNA genome be?
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