What would a graph of internal lung pressure compared to atmospheric pressure look like during one inhalation/exhalation cycle in a frog?

A. A
B. B
C. C
D. D
E. E


Answer: C

Biology & Microbiology

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Birds and reptiles save water by eliminating

__________ rich wastes as uric acid crystals. Fill in the blank(s) with the appropriate word(s).

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Some photosynthetic bacteria (e.g., purple sulfur bacteria) have only photosystem I, whereas others (e.g., cyanobacteria) have both photosystem I and photosystem II. Which of the following might this observation imply?

A) Photosystem II was selected against in some species. B) Photosynthesis with only photosystem I is more ancestral. C) Photosystem II may have evolved to be more photoprotective. D) Linear electron flow is more primitive than cyclic flow of electrons. E) Cyclic flow is more necessary than linear electron flow.

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In giraffes, long necks (N) are dominant to short necks (n). What is the phenotype of Nn?

a) medium neck b) short neck c) long neck d) all of the above

Biology & Microbiology

Which of the following statements about hormones is not true?

A. Hormones are secreted by axons. B. Hormones are targeted to specific organs within the body. C. Hormones are carried by the bloodstream. D. It takes time to deliver hormones to the cells. E. The effects of hormones are long lasting.

Biology & Microbiology