Plate tectonic theory is based on
a. a thermal convection model in which cool
material in the earth's mantle rises and
spreads laterally beneath the crustal plates.
b. the idea that the earth's crust is fragmented
into rigid crusts that are sinking slowly
beneath crustal plates.
c. the idea that coacervate formation causes
continents to drift apart slowly on their
crustal plates.
d. observations that the sea floor is slowly
spreading away from oceanic ridges due to
thermal convection in the mantle.
e. all of these.
D
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The influenza virus contains an RNA genome. Why do scientists typically have to make a new vaccine for the flu every year?
A. because our bodies develop resistance to the vaccine and it becomes less effective B. because the virus develops resistance to the vaccine C. because the virus can mutate into new strains D. because people change their habits each year and become susceptible to different strains of the virus E. because the common influenza virus can come from many species of animals including cats and dogs
Prokaryotic and eukaryotic ribosomes are structurally and chemically identical
Indicate whether the statement is true or false
What term describes a set of genes that is controlled by a common regulatory protein?
A. Regulon B. Kinase C. Codon D. Transcription
During the stage called neurulation, a flexible rod called a ________ forms along the midline of the dorsal surface of the embryo.
A. neural groove B. notochord C. somite D. dorsal nerve cord