Most of the fresh water in the world is used for
A. drinking.
B. bathing.
C. industrial needs.
D. watering lawns.
E. irrigation.
Answer: E
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Using transgenic animal models has its limitations because
A) prokaryotic cells are generally better at producing human proteins. B) bacterial pathogens that affect humans do not affect animals. C) the level of gene expression is significantly higher in animals. D) researchers cannot control where a transgene inserts itself into a genome.
In a test cross, a pure-breeding plant is crossed with a plant suspected to be heterozygous (Aa). What is the genotype of the pure-breeding plant?
What will be an ideal response?
Pronghorn antelopes are well adapted for dry conditions with extremes of temperature, especially cold. As global climate change causes the region where the pronghorns live to change, in temperature as well as plant, predator, and prey diversity and
abundance, what is likely to happen to the pronghorns? A) They will learn to eat whatever plants exist in their area and escape from any new predators that arrive. B) If the pronghorn population includes genetic variation that allows survival and reproduction in the new conditions, they will adapt. C) If climate change is not too rapid, the pronghorn can produce new traits needed to survive and reproduce in the changed conditions. D) Because pronghorns will need to be cooler, their fur will become thinner.
Which of the following statements describes the mitochondrial outer membrane?
(a) It is permeable to molecules with molecular mass as high as 5000 daltons. (b) It contains transporters for ATP molecules. (c) It contains proteins that are released during apoptosis. (d) It contains enzymes required for the oxidation of fatty acids.