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Consider a simple model cell that consists of cytoplasm surrounded by a cell membrane. The cell's initial volume is 3 nL and contains 0.3 M protein and 0.2M Ca++. The cell is placed into a 500mL tank of 0.1 M calcium chloride. Neither Ca++ nor Cl- can cross the membrane.
(a) Initially is the solution, isotonic, hypertonic, or hypotonic with respect to the cells cytoplasm?(b) What occurs as the cell achieves equilibrium?(c) What is the final osmolarity of the cell and solution?(d) What is the final cell volume?(e) What average charge do the proteins have to have to maintain cellular equilibrium?
Based on the data, was the hypothesis supported, and what can you conclude from this experiment?
If two normally pigmented parents have an albino (lacking pigment ) child, what is the probability that the next child is albino?
A mouse species has three phenotypes, black, brown and white. There are two genes responsible, and there is epistasis between the two genes. If two white mice mate, what is the probability that their first offspring will be white?
Give 2 distinguishing characteristics of a tRNA molecule. In translation what does the ribosome do? With reference to translation, what does translocation refer to?
Six generations of selection for decreased plasma cholesterol in a population of semi-wild pigs changed the mean from 3.21 mg/100 ml to 1.75 mg/100 ml. Estimate the heritability of plasma cholesterol levels in this population.
Eighteen museum specimens of the extinct great Auk were used to amplify coxI, a mitochondrial gene for cytochrome oxidase. DNA sequence analysis of 600 nucleotides of coxI revealed 5 alleles and the number of nucleotide differences between them are s..
Determine where the chain would be more likely to show beta bends or reverse turns.explain where one would fin cross-linked disulfide bonds.
Provide a basic toxicology report of the effects of PVC on a human, including possible carcinogens or neurotoxins?
NASA hopes they may one day be useful in producing some electricity on a spacecraft. What mode of nutrition do these bacteria most likely use.
A water molecule is held together through covalent bonds. Becauses the electrons are not shared equally, water exhibits many unique characteristics that are beneficial for life.
It is though that the glucose transporter switches between two conformational states in a completely random fashion. How is it possible for such a system to move glucose across the membrane efficiently in a single direction?
Energy is stored in different forms in the body. ATP is very unstable and is put to use very quickly in cells. Other storage molecules last longer.
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