Downward bending of a seedling root can be blocked by ____
a. moving it to a dark room
b. auxin transporters
c. auxin transport inhibitors
d. mutations in genes that code for auxin transport proteins
e. auxin transport inhibition and mutations in genes that code for auxin transport proteins
ANSWER: e
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The mutation responsible for Huntington's disease is a
A. missense mutation. B. nonsense mutation. C. frameshift mutation. D. triplet repeat expansion mutation.
Why have scientists been unable to grow the majority of bacteria and archaea in pure culture in a laboratory setting?
A. Most microorganisms reside in extreme environments that are toxic to human life, so samples cannot be collected for cultivation of the microbial inhabitants in the laboratory. B. Many species have metabolic requirements that are difficult to fulfill in the laboratory. C. DNA sequencing technology was not sufficiently advanced to give scientists the ability to identify prokaryotic species in nature, a requisite for growing microbes in the laboratory. D. Cells with unusual morphological characteristics cannot be grown in the laboratory.
Old man's beard (Usnea trichodea) and yellow Evernia lichens are sensitive to elevated levels of ____
a. sulfur dioxide b. nitrogen oxides c. nitrate d. sunlight e. fluoride salts
What force is attributed to giving water molecules special properties?
a. Solvent b. Covalent bonding c. Polarity d. Hydrogen bonding