Membranes of some thermophilic Archaea are stabilized by ether linked phospholipids.
Answer the following statement true (T) or false (F)
True
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An earthquake decimates a ground-squirrel population, killing 98% of the squirrels. The surviving population happens to have broader stripes, on average, than the initial population. If broadness of stripes is genetically determined,
what effect has the ground-squirrel population experienced during the earthquake? A) directional selection B) disruptive selection C) a founder event D) a genetic bottleneck E) gene flow
All the following statements about the concept of niche are true, EXCEPT -
a) A niche is the range of conditions an organism can survive in b) The fundamental niche is always a subset of the realized niche c) The niche of an organism is influenced by predators and competitors d) The fundamental niche is all the environmental conditions that allow a species to maintain a stable population size e) None of the above (all are true)
A central vacuole
(a) is found only in plant cells. (b) may take up between 50% and 90% of the cell’s interior. (c) regulates water balance. (d) is all of the above.
Which structures in the plant connect the cytoplasm of adjacent plant cells?
a. Lignin b. Extracellular matrix c. Cell membrane d. Cell wall e. Plasmodesmata