What tissue type produces the tough coverings that package organs?
A. loose connective tissue
B. dense irregular connective tissue
C. collagen
D. dense regular connective tissue
E. adipose
B. dense irregular connective tissue
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Which of the following generally makes skeletal muscle different from both smooth and cardiac muscle?
A) Skeletal muscles are made of cells called "fibers." B) Skeletal muscle cannot be contracted voluntarily. C) Skeletal muscle can be contracted voluntarily. D) Skeletal muscle cells have nuclei.
A patient is bitten by a dog with confirmed rabies infection. After treating the bite wound, the physician injects the patient with antibodies that are specific for the rabies virus to prevent the development of an active infection. This is an example of:
A) Natural active immunity B) Artificial active immunity C) Natural passive immunity D) Artificial passive immunity
Which of the following shows the steps of a viral infection in the proper order?
A) virus locates host cell ? enters nucleus ? alters host cell DNA ? destroys cell membrane B) virus locates host cell ? alters host cell DNA ? host cell produces copies of virus ? copies enter host cell nucleus ? nucleus leaves cell C) virus locates host cell ? penetrates cell membrane ? enters nucleus ? alters host cell DNA ? host cell produces copies of virus D) virus locates host cell ? forms hydrogen bonds ? changes DNA to RNA? host cell produces copies of virus
Organisms such as lizards that need to maintain body temperature through external means do so by
A. running frequently to warm up. B. sunbathing. C. swimming in geothermal pools. D. eating large meals to provide calories for heat production. E. shivering to produce heat.