Each of the following statements about carbon is TRUE EXCEPT which one?
A) All organic molecules contain carbon.
B) Carbon atoms form four covalent bonds.
C) Carbon atoms form diverse molecules that may be linear, branched, or circular.
D) Carbon can form strong hydrogen bonds with other elements.
E) Carbon can form bonds with hydrogen, oxygen, nitrogen, as well as another carbon atom.
D
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While synthesizing a new blue pigment, a chemist notices that the new compound congregates between an aqueous (water) environment and a hydrophobic environment. When added to a mixture of oil and water, the pigment creates a blue ring around the droplets of oil. Which of the following statements best describes this new pigment?
A) The pigment is a polar molecule and is forming hydrogen bonds with both the water and oil molecules. B) The pigment is hydrophilic and will not form hydrophobic bonds with the oil. C) The pigment is amphipathic, having polar and nonpolar regions. D) The pigment is neither polar nor nonpolar; it is apolar. E) The pigment is probably hydrophobic and is attempting to bond with the oil.
Cold sores or fever blisters are caused by the ________ virus.
Fill in the blank(s) with the appropriate word(s).
An example of a single-gene trait that distinguishes humans from other primates is
A) the presence of two sides to the brain. B) the abundance of fetal hemoglobin in humans. C) the lack of adult hemoglobin in marmosets and lemurs. D) our non-opposable thumbs.
The first major split in evolution separated
a. all three lineages from each other. b. Archaea from bacteria and eukaryote ancestors. c. Bacteria from Archaea and eukaryote ancestors. d. eukaryote ancestors from Archaea and Bacteria. e. none of these.