Which of the following was an early tetrapod that differed from fishes in part by having a neck, and for which nearly complete skeletal data are available from fossils?

a. Anolis
b. Dunkleosteus
c. Archaeopteryx
d. Ichthyostega


Answer: d. Ichthyostega

Biology & Microbiology

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Prior to the publication of Charles Darwin's book, On the Origin of Species, what was the prevailing public consensus regarding species evolution?

A. That species were permanent and unchanging B. That species evolved through physical changes that led to success C. That species were modified over time, but did not change into new species D. That species evolved by means of natural selection

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One liter of a solution of pH 2 has how many more hydrogen ions (H+) than 1 liter of a solution of pH 6?

A) 4 times more B) 40,000 times more C) 10,000 times more D) 100,000 times more

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A shortage of cholesterol in the body could interfere with the formation of:

A) all of the choices are correct B) estrogen C) cell membranes D) testosterone E) progesterone

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In order for bacteriophage to be released from the host by a lysis mechanism, enzymes are required that ________.

A. halt ATP synthesis B. damage the cell wall and cytoplasmic membrane C. degrade the host chromosome D. stabilize the cytoplasmic membrane and cell wall

Biology & Microbiology