Which one of the following elements is found in every organic molecule?

A. carbon
B. hydrogen
C. nitrogen
D. oxygen
E. sulfur


Answer: A

Biology & Microbiology

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What was one of the pieces of evidence most critical to the discovery of DNA structure?

A. Its composition of four different nucleotides. B. The discovery of its semi-conservative mode of replication. C. An X-ray diffraction pattern suggesting a double helix shape. D. The backbone containing sugar-phosphate linkages. E. The hydrogen bonding between different nucleotides.

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Which of the following is a diploblast?

a. A comb jelly b. A goat c. A spider d. An octopus

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The results of an experiment

a. don't have to be repeatable. b. should be repeatable by the investigator. c. should be repeatable by other investigators. d. must be both b and c.

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What is the name of the tubules in true kidneys?

a. metanephridia b. protonephridia c. hepatic tubules d. nephrons

Biology & Microbiology