The most common fatal genetic disorder of Caucasians is

A. muscular dystrophy.
B. sickle cell anemia.
C. cholera.
D. cystic fibrosis.
E. hemophilia.


Answer: D

Biology & Microbiology

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Platelets are formed when fragments from large cells called ________ break off

Fill in the blank(s) with correct word

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The termination of translation occurs when a release factor recognizes the stop codon.

Answer the following statement true (T) or false (F)

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Changing environmental conditions would most likely cause an existing species to undergo ____

a. disruptive selection b. deleterious mutation c. directional selection d. stabilizing selection e. lethal mutation

Biology & Microbiology

Mass extinctions

A. have occurred at least 5 times throughout Earth's history. B. may have been due to climatic changes after a metorite collision. C. may have followed continental drift. D. All of the choices are correct.

Biology & Microbiology