The phylogenetic species concept (PSC) declares that a group is a species if it
A. is reproductively isolated from other species.
B. has no synapomorphies.
C. has evolved one or more of its own derived characters.
D. is allopatric.
E. looks different than other species.
Answer: C
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The building blocks of DNA are.
A. genes. B. double helices. C. amino acids. D. nucleotides. E. chromosomes.
In what sense is the genetic code nearly universal?
a. All organisms on Earth share in common approximately 85 percent of their DNA sequence. b. The genetic code has its origin in meteorites from distant regions of interstellar space. c. Nearly every possible combination of codons occurs in each organism’s chromosomes. d. Specific mRNA sequences generate the same proteins in nearly all known organisms.
When Warnecke and colleagues were looking for genes that are involved in the digestion of lignocellulose by termites, they needed genes __________
A) from the sequences of the termite genome B) of the primary strain of bacteria that inhabit the termites' bodies C) for the bacterial enzymes found in the lignocellulose-digesting part of the gut D) for the long-term maintenance of lignin-digesting microbial organisms E) that can be expressed in a lignocellulose-rich environment
A biodiversity hotspot is a(n):
a. protected area with few humans present. b. type of island from which humans are leaving. c. an area rich in endemic species and high in human population. d. a type of corridor to which humans are rapidly migrating. e. an area poor in endemic species in a tropical location