Sulfur is found directly below oxygen on the periodic table. What type of bond would you predict S-H would form?
A. nonpolar covalent bond
B. ionic
C. hydrogen bond
D. polar covalent
Answer: D
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If you were to discover a new species of animal that did not have body segments, but shed its exoskeleton and was a protostome, under the molecular phylogenetic scheme, you would allocate it to which of the following phyla?
A. Mollusca B. Echinodermata C. Nematoda D. Platyhelminthes E. Arthropoda
Bacteria are helpful to humans in many ways, including all of the following EXCEPT which one?
A) production of antibiotics B) breakdown of raw sewage C) digestion of cellulose in the human intestine D) production of soy sauce E) production of vitamins for the human body
The two tissues of the eye with exposed surfaces susceptible to contamination are the ________ and the ________.
A. conjunctiva; lens B. cornea; iris C. conjunctiva; iris D. conjunctiva; cornea E. cornea; lens
Which element's isotope is commonly used to determine when biological samples such as fossils, were formed?
A. nitrogen B. oxygen C. carbon D. hydrogen E. sulfur