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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology

The accompanying figure illustrates a ____

a. book lung b. tracheal system c. set of gills d. lung micrograph e. circulatory system

Biology & Microbiology