Reptiles are __________ (cold-blooded animals)
with scales. Fill in the blank(s) with the appropriate word(s).
Answer: ectotherms
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Sharks and rays deal with the osmotic stress of living in seawater mainly by
a. active transport of ions into the body through the gills. b. excreting nitrogenous wastes through their kidneys as urea. c. active transport of ions out of the body by chloride cells. d. excreting excess salt through the actions of specialized salt glands in their heads. e. maintaining high levels of urea and trimethylamine oxide in body fluids.
Which of the following supports the chordate body and is the first feature of the skeleton to form?
a) dorsal nerve cord b) notochord c) series of pharyngeal slits d) muscular, post-anal tail
Which is the correct pathway of a protein through a cell as it is being made?
A. Nucleus, smooth endoplasmic reticulum, Golgi apparatus B. Ribosome, Golgi apparatus C. Nucleus, Golgi apparatus, ribosome D. Golgi apparatus, ribosome, rough endoplasmic reticulum
It is FALSE that enzymes
A. are catalysts. B. are proteins. C. lower the activation energy of a reaction. D. are used up in a reaction.