The major disadvantage of using stem cells derived from human embryos was:
a. they did not differentiate.
b. they were difficult to maintain in culture.
c. they did not function in humans other than those that they were obtained from.
d. they could not be frozen.
e. they did not contain fully active telomerase.
B
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Growing useful mutants that develop from callus culture is called ____
a. fragmentation b. protoplast fusion c. somaclonal selection d. grafting e. apomixes
Hertz and Huey discovered which of the following compensatory mechanisms that allows lizards
living at high altitudes to survive lower mean air temperatures?
a. hibernation b. torpor c. increased time spent basking d. increased consumption of food e. shelter-seeking behavior
All EXCEPT which one of the following are the
reasons for the rapid population explosion of humans? a. increases in carrying capacity b. expansion into new habitats c. removal of limiting factors d. reproduction occurring earlier in the life cycle e. None of these
What trends occurred in the size of the sporophyte and gametophyte generations as plants became adapted to life on land? How can these trends be explained?
What will be an ideal response?