If a suspension of cells is frozen and fractured, the most likely path of the fracture plane will be
a. between the cell surface and the outside solution.
b. between the membrane and the cytoplasm of the cells.
c. through the middle of the cytoplasm.
d. between the two leaflets of the cell membranes.
Ans: d. between the two leaflets of the cell membranes.
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Plant breeders induce polyploidy in plants by using ________
a. selective breeding b. colchicine c. grafting d. tissue culture
Single covalent carbon-carbon bonds have a bond energy of 83 kcal/mol while visible light from the sun has 40–70 kcal of energy per mole of photons. Why is this property of carbon-carbon bonds important for life on earth?
Based on this observation, how could the degradation of the earth's atmosphere and an increase in high-energy ultraviolet radiation affect life on earth? What will be an ideal response?
The hemoglobin molecule
A. has four subunits of two types. B. has two subunits that can be formed from four types. C. is involved in amino acid metabolism. D. acts as a cell surface receptor. E. is controlled by a single gene.
A traditional business model is one:
A) which is very rare. B) which is the basis of only a few companies. C) in which the central strategy for creating value is based on meeting market demands. D) in which the central strategy for creating value is based on mitigating social problems.