During the formation of a blood clot, conversion of prothrombin into the enzyme thrombin requires
A) mitochondria.
B) transport of proteins from platelets.
C) calcium ions.
D) leukocytes.
E) albumin.
C
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Which of these is an example of hybridization?
a. breeding beagles and pugs to produce puggles b. breeding Hereford and Aberdeen Angus cattle to produce Black Baldy cattle c. breeding African Servals with domestic cats to produce Savannah cats d. breeding American Saddlebred and Arabian horses to produce National Show Horses
Muscular dystrophy _____
a. is a genetic disorder b. is a type of food poisoning c. can be prevented with a vaccine d. is caused by a virus e. both can be prevented with a vaccine and is caused by a virus
During embryo development, the origin of muscle tissue is from the
A. endoderm. B. ectoderm. C. ectoderm or endoderm. D. mesoderm or ectoderm. E. mesoderm.
Which one of the following is an occasional severe complication of chickenpox?
a) Reye's syndrome b) Toxic shock syndrome c) Scalded skin syndrome d) Herpes encephalitis