What is the chemical basis for water's role as the universal solvent?
A. Because water is polar, it disrupts most covalent bonds.
B. Because water is polar, it disrupts other hydrogen bonds.
C. Because water is polar, it disrupts ionic bonds.
D. a and b.
E. b and c.
Answer E
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Which of the following is a disadvantage of using Bt to control insects?
A. Bt does not accumulate in the soil or in nontarget animals. B. Though not well documented it is possible for horizontal gene flow to introduce Bt genes into other plants. C. The toxin can only be activated in target insects so it is nontoxic to mammals. D. Bt is easily degraded in the natural environment.
A diet high in animal products and hydrogenated vegetable margarine may increase the risk for heart disease. This is because
A) most animal fats are unsaturated and most hydrogenated vegetable margarines contain high levels of steroids. B) most hydrogenated vegetable margarines are hydrogenated oils and most animal products contain high levels of phospholipids. C) most animal fats are used for energy storage and most hydrogenated vegetable margarines contain high levels of unsaturated fats. D) most animal fats are saturated and many hydrogenated vegetable margarines contain high levels of trans fats.
Pleomorphic bacteria
A) have a slightly curved rod shape. B) are flexible. C) reproduce by snapping division. D) are roughly spherical. E) vary in size and shape.
Thirty-six colonies grew in nutrient agar from 1.0 ml of undiluted sample in a standard plate count. How many cells were in the original sample?
A) 4 per milliliter B) 9 per milliliter C) 18 per milliliter D) 36 per milliliter E) 72 per milliliter