Frogs and toads belong to which of the following lineages?
a. Caudata
b. Aves
c. Squamata
d. Gymnophiona
e. Anura
E
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Why did scientists originally hypothesize that proteolytic enzymes such as pepsin and trypsin are secreted in inactive form?
A) These proteolytic enzymes, in active form, would digest the very tissues that synthesize them. B) They identified the hormone that activates pepsin and trypsin. C) The stomach is too acidic to maintain these enzymes in their active form. D) Pepsin and trypsin have never been isolated in their fully activated form.
The oldest known plant is at least ___ years
old
a. 430 b. 4,300 c. 43,000 d. 430,000 e. 4,300,000
All of the following secrete hormones except
A. hypothalamus. B. testes. C. gall bladder. D. pineal gland. E. adrenal gland.
Which statement best summarizes the difference between ectothermic and endothermic organisms?
A) Ectotherms are warm-blooded, but endotherms are cold-blooded. B) Endotherms control their temperature, but ectotherms have no control over their temperature. C) Ectotherms absorb external heat, but endotherms use metabolic heat to maintain a warm, steady body temperature.