The optimal percent body fat for women is estimated to be:
What will be an ideal response?
20-30%
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Whiteflies are common pest insects found on cotton, tomato, poinsettia, and many other plants. Nymphs are translucent and mostly sessile, feeding on their host plants' phloem (sap) from the undersides of leaves. T
hey undergo incomplete metamorphosis into winged adults. Because whitefly nymphs cannot escape predation by moving, you hypothesize that their translucent bodies make them hard to spot by predators. How could you directly test this hypothesis? A) Compare rates of predation on whitefly nymphs on plant leaves of different colors (for example, red vs. green poinsettia leaves). B) Compare rates of predation on whitefly nymphs coated with a nontoxic dye vs. undyed whitefly nymphs. C) Compare rates of predation on whitefly nymphs vs. whitefly adults. D) Compare rates of predation on whitefly nymphs by predators that are translucent vs. predators that are not translucent. E) Compare rates of predation on whitefly nymphs feeding on poisonous plants vs. those feeding on nonpoisonous plants.
A poorly immunogenic vaccine often suggests the foreign proteins were not properly recognized by the immune system due to a lack of ________ necessary, which can also be engineered to occur with additional molecular manipulations
A) complex folding B) methylation C) glucosylation D) glycosylation
Which of the following are consequences of Arctic ice melting due to global warming?
a. arctic animals are losing suitable habitat b. polar bears are in poorer condition and their weight has decreased over the last 30 years c. more solar radiation is being absorbed by the ocean d. the temperature is increasing in the Arctic at an accelerated rate e. all of the above
The anti-bacterial peptides secreted by frogs and toads is produced by:
a. epithelial cells. b. goblet cells. c. endothelial cells. d. sweat glands. e. oil glands