Biotechnology involves the
a. use of microorganisms to make desired products.
b. use of animal cells to make vaccines.
c. development of disease-resistant crop plants.
d. use of microorganisms to make desired products and the use of animal cells to make vaccines.
e. use of microorganisms to make desired products, the use of animal cells to make vaccines, and the development of disease-resistanct crop plants.
Ans: e. use of microorganisms to make desired products, the use of animal cells to make vaccines, and the development of disease-resistanct crop plants.
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What is the selective advantage of a mature red blood cell being flat rather than a sphere?
A. It maximizes the relative surface area available to exchange gases. B. It provides more sites for the membrane-bound hemoglobin molecules which transport oxygen. C. It saves energy by making more membrane relative to the volume of the cell. D. It provides more membrane for the electron transport chains where oxygen is consumed. E. The cell's surface area to volume will decrease, making it easier for the cell to fit through arteries and veins.
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Plants commonly exhibit
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According to the theory of endosymbiosis, the origin of chloroplasts probably involved:
A) the formation of colonies of cyanobacteria. B) the formation of cell walls around the photosynthetic pigments. C) engulfing of small photosynthetic prokaryotes by a larger cell. D) the accumulation of free oxygen in ocean waters. E) infolding of the cell membrane around circular pieces of DNA in the cytoplasm.