Each ________ on the hemoglobin subunit is capable of binding an oxygen molecule, thereby allowing ________ oxygen to bind with one hemoglobin molecule.

A) globin : four
B) heme : four
C) globin : three
D) heme : three
E) free iron : one


Answer: B) heme : four

Biology & Microbiology

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The subclass of Chondrichthyes with an operculum is called:

a. sharks. b. skates. c. rays. d. chimaeras. e. hagfish.

Biology & Microbiology

Which of the following levels of organization are correctly arranged from smallest to largest?

a. tissue, organ, organ system b. tissue, organ system, organ c. organ system, organ, tissue d. organ system, tissue, organ e. organ, organ system, tissue

Biology & Microbiology

Which of the following statements concerning adaptive immunity is FALSE?

A) It is always present and instantly protects against infection. B) It can be stimulated by vaccination. C) It requires specific recognition of microbes and antigens. D) It can form memory responses.

Biology & Microbiology

Which of the following human activities could contribute to the eutrophication of a lake? (Check all that apply.)A) Dumping piles of leaves near a lakeB) Planting trees around the periphery of the lakeC) Washing clothes with soap in the lakeD) Feeding the ducks in the lakeE) Dumping plastic trash into the lakeF) Fertilizing lawns near the lake

What will be an ideal response?

Biology & Microbiology