Based on their experiment with T2 bacteriophages, Hershey and Chase concluded that
A. virulent bacteria can transform nonvirulent bacteria.
B. the phage coat contains the genetic material.
C. DNA replication is semiconservative.
D. A always pairs with T and G always pairs with C.
E. DNA functions as the genetic material.
Answer: E
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About thirteen different species of finches inhabit the Galàpagos Islands today, all descendants of a common ancestor from the South American mainland that arrived a few million years ago
About thirteen different species of finches inhabit the Galápagos Islands today, all descendants of a common ancestor from the South American mainland that arrived a few million years ago. Genetically, there are four distinct lineages, but the thirteen species are currently classified among three genera. The first lineage to diverge from the ancestral lineage was the warbler finch (genus Certhidea). Next to diverge was the vegetarian finch (genus Camarhynchus), followed by five tree finch species (also in genus Camarhynchus) and six ground finch species (genus Geospiza). If the six ground finch species have evolved most recently, then which of these is the most logical prediction? A) They should be limited to the six islands that most recently emerged from the sea. B) Their genomes should be more similar to each other than are the genomes of the five tree finch species. C) They should share fewer anatomical homologies with each other than they share with the tree finches. D) The chances of hybridization between two ground finch species should be less than the chances of hybridization between two tree finch species.
The California populations of the Northern elephant seal are descendants from a very small population of seals that was over-hunted in the 1890s. Heterozygosity in this population would be expected to be ________ due to _______________.
A. great; a bottleneck effect B. slight; a bottleneck effect C. great; assortive mating D. great; disruptive selection E. slight; the founder effect
Members of the genus Actinomyces are either straight or slightly curved rods, or slender filaments with true branching.
Answer the following statement true (T) or false (F)
The genetic code is said to be degenerate because ____
a. some codons that do not specify an amino acid b. most amino acids are represented by more than one codon c. the code varies considerably between different organisms d. the code is commaless, with no indicators of spaces between codons e. the code varies considerably between different cell types within a multicellular organism