Which one of the following elements is found in every organic molecule?
A. carbon
B. hydrogen
C. nitrogen
D. oxygen
E. sulfur
Answer: A
You might also like to view...
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.
Which of the following is a diploblast?
a. A comb jelly b. A goat c. A spider d. An octopus
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.
What is the name of the tubules in true kidneys?
a. metanephridia b. protonephridia c. hepatic tubules d. nephrons