Giardia are diplomonads which have nuclei that
A) appear as two separate chromosomes but are weakly joined.
B) contain one small and one large nucleus per cell.
C) have one nucleus enclosed in a mitosome and another nucleus in their cytoplasm.
D) occur as two similar sizes per cell.
Answer: D
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The bottleneck effect is the loss of genetic diversity that occurs when
A. many organisms have successful survival rates. B. many members of a population die. C. large groups of individuals leave their home population and establish new settlements. D. small groups of individuals leave their home population and establish new settlements. E. many members of a population reproduce.
Phosphofructokinase is stimulated by high levels of ATP
__________________ Indicate whether the statement is true or false.
Paleontological studies indicate that, over millions of years,
A. groups of species that have coevolved rise and go extinct together. B. species that occurred together in the distant past still occur together today; the community has held constant. C. the extinction of species is not related to the community in which they lived. D. species seem to come and go individually as niches within a community become available. E. species richness is constant over time.
The major difference between the human male and
female reproductive systems is the a. provision of a site for fertilization and embryo development in the female. b. production of haploid gametes only by the male. c. diploid polar bodies of the female. d. generation of millions of eggs but only thousands of sperm each month. e. presence of a duct system opening to the body’s exterior only in females.