Which statement is true regarding kidney stones?
A. Their removal always requires surgery.
B. Most of them block a ureter or urethra.
C. They are made of uric acid and calcium.
D. They cause tumors in the kidney.
E. They occur as a result of diabetes mellitus.
Answer: C
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What is the difference between a community and an ecosystem?
A. A community includes interacting populations with their surrounding environment, while an ecosystem does not include the surrounding environment. B. A community includes interacting populations without their surrounding environment, while an ecosystem includes the surrounding environment. C. A community and an ecosystem are the same thing in ecology. D. A community includes abiotic factors, while an ecosystem does not.
An advantage to studying linkage disequilibrium is that ________
A) it provides another tool enabling the reconstruction of the history of genes and populations B) it provides clear evidence of speciation events C) it can be used to identify alleles that have been recently selected by natural selection D) Both A and C.
Adaptations that have enabled vertebrates to survive on land include all of the following EXCEPT
A. a water-resistant epidermis B. development of a bony skeleton C. development of longs D. external fertilization E. embryos enclosed within membranes
Evolution can be defined as
A) one species diverging into two species. B) a change in the genetic makeup of a population over time. C) a change in the phenotype of an individual over his or her lifetime. D) a change in the genetic makeup of an organism over time. E) an individual changing into another species.