An ecologist who studies the distribution of a frog species along a latitudinal gradient is performing a(n) ____
experiment.
a. natural
b. experimental
c. predictive
d. lab
e. modeling
ANSWER: a
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Like DNA microarrays, Northern blots analyze the levels of mRNA. However, Northern blots are almost always prepared with a probe tagged with one label, whereas DNA microarrays almost always use two groups of probes, each one tagged with a different fluore
scent label. What is the advantage of using two labels for the microarray probes? The two labels _____. A) increase the sensitivity of the microarray B) allow the analysis of the expression of more genes C) allow simultaneous assay of levels of DNA and RNA D) allow comparison of gene expression between two samples
In humans, ability to roll the tongue (R) is dominant to being unable to roll (r). Having freckles (F) is dominant to having no freckles (f). A freckled tongue-roller could have which of the following genotypes?
A. RRFF B. RrFf C. rrFF D. RRFF and RrFf only E. all of the answer options are correct
Which theory states that eukaryotic organelles originated as prokaryotes that survived ingestion by a host cell and
ultimately evolved mutualistic relationships with the host cell? a. endosymbiont theory b. heterosymbiont theory c. obligative symbiotic theory d. facultative symbiotic theory e. autotrophic symbiotic theory
Crick and his colleagues proposed that the genetic code consists of a series of blocks of information, called ________, each corresponding to one amino acid in an encoded protein.
A. polypeptides B. alleles C. genes D. codons