A deletion of a particular stretch of chromosome 15 can cause either Prader-Willi syndrome or Angelman syndrome, depending on
A. whether a nondisjunction event has occurred.
B. whether or not the region is methylated properly.
C. whether a translocation event has occurred.
D. the parental origin of the normal and deleted chromosome.
Answer: D
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Gardeners sometimes plant clover between productive growing seasons. Why would this practice be beneficial?
A. Several types of nitrogen-fixing bacteria form a symbiotic relationship with the roots of clover. This would increase the amount of nitrogen in the soil available for subsequent seasons of other plants' growth. B. Clover is consumed by a number of animals. This would encourage the animals to feed/graze on the areas, leaving behind nitrogen-rich manure that would act as a natural fertilizer for subsequent seasons of other plants' growth. C. Clover is a unique plant that is capable of atmospheric nitrogen-fixation (pulling nitrogen directly out of the air and turning it into ammonia or amino acids). This directly provides nitrogen compounds for the soil for subsequent seasons of other plants' growth. D. The beneficial effect is more for water retention and elimination of soil erosion in between growing seasons. It has nothing to do with nitrogen compounds in the soil.
Skeletons of modern cetaceans have remnants of a __________.
A. rib B. head C. flipper D. pelvis E. spine
One reason auxins are called the "master plant hormones" is because they mostly work apart from other hormones.
Answer the following statement true (T) or false (F)
Isotopes of an element are differentiated by their ____.
A. atomic weight B. number of orbital shells C. element name D. mass number E. electron profile