Viruses are important in the study of cell biology because
A) they cause disease.
B) they are the simplest form of cellular life.
C) they are used as model organisms to study molecular biology and genetics.
D) they cause disease and are used as model organisms to study molecular biology and genetics.
E) they are the simplest form of cellular life and are used as model organisms to study molecular biology and genetics.
Answer: D
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Tetanus vaccine contains
A. inactivated bacteria. B. inactivated spores. C. live bacteria. D. inactivated tetanospasmin.
The size of a plant's seeds reflects an evolutionary trade-off. Large, heavy seeds contain ample nutrients to fuel seedling growth but may not travel far. In contrast, small seeds store limited nutrients but disperse far and wide. Human-cultivated crops typically have larger seeds than do their wild ancestors. How has human farming altered the evolution of these crops?
A. We grow the plants under conditions that favor the growth of larger seeds. B. By using fertilizers, the seeds do not need to store as many nutrients. C. We have created crop plants that are more competitive in the wild than their ancestors. D. Because we spread the seeds, we can spread more smaller seeds per acre, thus favoring these plants. E. We have removed the selection pressure favoring small seed size.
The primary intracellular cation is ________.
Fill in the blank(s) with the appropriate word(s).
Membrane-bounded organelles facilitate faster chemical reactions because:a
reactants are within close proximity to each other. b. membranes lower the activation energy of biochemical reactions. c. membrane-bounded organelles act as catalysts for biochemical reactions. d. reactants move faster within membrane-bounded organelles. e. reactants are less likely to encounter each other within membrane-bounded organelles.