Most atmospheric oxygen comes from photosynthesis. From which of the following molecules is the oxygen derived?
A. carbon dioxide
B. chlorophyll b
C. chlorophyll a
D. glucose
E. water
Answer: E
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Which of the following statements is true regarding lymph and the lymphatic system? Select all correct choices
A. Lymph is rich in proteins filtered out of the bloodstream. B. Lymph contains water filtered out of the bloodstream. C. The lymphatic system is composed solely of the same vessels and arteries forming the circulatory system. D. The lymphatic system is composed of its own distinct set of vessels, through which blood does not travel.
Which of the following terms represents a cell that can form any other cell of the organism?
A. Pluripotent B. Totipotent C. Unipotent
. The more severe form of African sleeping sickness is called the
A. Gambian form. B. Rhodesian form. C. Guyanan form. D. Brazilian form
Which one of the following is TRUE regarding the flow of energy through an ecosystem?
A) Energy flows from the sun to consumers and then to producers. B) Energy flows in multiple directions through an ecosystem. C) Energy is cycled through an ecosystem and rarely lost as heat. D) Energy flows from the sun to producers and then to consumers. E) As energy flows through an ecosystem, it does not change form.