True or False: some ions that facilitate enzymatically catalyzed reactions are capable of catalyzing reactions independently of an enzyme
A. true
B. false
Answer Key: A
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Over evolutionary time, photosynthesis has effectively poisoned itself by producing an oxygenic atmosphere because __________
A. rubisco is an oxygenase B. rubisco is a carboxylase C. O2 is a strong oxidant D. rubisco is an oxygenase and O2 is a strong oxidant E. rubisco is an oxygenase and O2 is a strong reductant
Select all of the following that are true about the chondrichthyans.
_____ They have internal fertilization. _____ They were the first fish to develop teeth. _____ Their buoyance is maintained by oil. _____ They are known for acute color vision. _____ Their teeth are composed of dentin and enamel.
Mammals are the only vertebrates to possess
A. hair. B. single loop circulation. C. a four-chambered heart with a pulmonary circuit. D. endothermy. E. live birth.
The accompanying figure illustrates a ____
a. book lung b. tracheal system c. set of gills d. lung micrograph e. circulatory system