Each of the following characteristics is true for both facilitated diffusion and active transport EXCEPT
____.
a. the use of transport proteins is required
b. transport proteins are specific for the molecules being transported
c. transport proteins can become saturated
d. a concentration gradient is present
e. the direction of transport is always with the concentration gradient
E
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Consumer cleaning products, such as hand soaps and dishwashing detergents, frequently make claims such as “kills 99% of germs!” Despite these claims, overuse of antibacterial soaps has been correlated with an overall increase in antibiotic-resistant bacteria. How can you explain this unexpected result?
a. Commercial cleaning agents are highly basic, and antibiotics are highly acidic, so the manufacturing process actually has the effect of neutralizing both, rendering the mixture useless. b. The antibacterial agents contained in these cleaning products have specific storage requirements to maintain efficacy; consumers should keep them refrigerated when not in use. c. Bacteria that are not killed by these products are able to exchange plasmids carrying genes for antibiotic resistance with each other and with non-resistant bacteria that are added to the colony. d. Some cleaning products that are marketed as having antibacterial properties are actually designed to have the opposite effect, in order to force consumers to buy increasing volumes of soap over time.
Which statement about the phosphorus cycle is true?
a. The natural weathering of rocks sends phosphate into lakes and oceans. b. Phosphate from geothermal vents causes dead zones in lakes. c. Phosphate enters the oceans primarily through precipitation. d. The average phosphate ion resides in the ocean for less than 500 years.
White fruit color in summer squash is influenced by a dominant allele W, whereas colored fruit must be ww. In the
presence of ww, a dominant gene G results in yellow fruit, and homozygous gg results in green fruit. Give the F2 phenotypic ratios resulting from a cross of a true-breeding plant with white fruit (genotype WW GG) with a plant with green fruit. What will be an ideal response?
Most organisms grow as much as possible throughout their lives.
a. True b. False c. I don't know the answer