An ion is formed ____
a. during covalent bonds
b. when water molecules are bound together
c. when atoms exchange electrons
d. when atoms share electrons equally
e. when atoms share electrons unequally
ANSWER: c
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When the predator population is below the prey isocline, the prey population is
a. increasing b. decreasing c. neither increasing nor decreasing
What would you predict would happen to a plant after being invaded by Rhizobium bacteria?
A) It would die. B) It would grow better. C) It would grow worse. D) It would wilt.
Which of the following could accept one (and only one) electron?
A) carbon (atomic number = 6 ) B) nitrogen (atomic number = 7 ) C) oxygen (atomic number = 8 ) D) hydrogen (atomic number = 1 )
A geneticist is studying a particular Drosophila mutant that produces a phenotype of "no wing" due to a mutation in a gene called wingless. She takes the mutant wingless and mutagenizes it. She hypothesizes that any fly that emerges with wings will be
due to the original mutated gene reverting back to the wild-type allele. From this study, she identifies a fly that now has wings. When she sequences the wingless gene, she discovers that the original mutation is still there, and there are no other mutations in the wingless gene. However, a second gene at a separate locus is mutated. The second mutation is best classified as a(n) ________. A) conditional mutation B) intergenic suppressor mutation C) haploinsufficiency mutation D) intragenic suppressor mutation E) null mutation