Which one of the following would be the effect of salty environments on plants?
A. loss of water
B. damage to membranes
C. uptake of salt that causes toxicity
D. water intake that causes turgid cells
E. damage to plant proteins
B. damage to membranes
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Adam was certain that he had Native American ancestors, based on tales that his grandfather told of the family history. He is disappointed when he takes a genetic ancestry test by sending a saliva sample to a testing company, because it does not confirm what he believed to be true. Adam may actually indeed have Native American ancestors because
A) DNA ancestry tests must be performed on blood to be accurate. B) DNA ancestry tests only work on females, because only they have mtDNA. C) the DNA sequences identified in ancestry tests do not reflect input from all lineages. D) the testing labs do not test for Native American Y chromosome sequences.
Which of the following contributed to the growth in human population that began about 11,000 years ago?
a. sidestepping limiting factors b. increased carrying capacity c. all of the choices d. geographic expansion
Photorespiration is a wasteful process that could be largely avoided if rubisco would bind only CO2
__________________ Indicate whether the statement is true or false.
When heterozygotes are favored over homozygotes __________ selection occurs
a. stabilizing b. directional c. disruptive d. frequency-dependent e. abnormal