Ribosomes can catalyze formation of peptide bonds. This supports the hypothesis that _____
a. an RNA world preceded DNA-based genomes
b. RNA can hold more information than DNA
c. the first protists had RNA as their genetic material
d. all of these
A
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The ______ includes all the ocean’s open water.
a. aphotic zone b. photic zone c. benthic zone d. pelagic zone
Which of the following is the correct starting step for scientific inquiry?
A. Forming a question to answer B. Finding an experiment to challenge C. Analyzing the data D. Observing a phenomenon E. There is no one correct starting point you have to start with, since there is no one "correct" scientific inquiry process.
The painters of the catacombs preferred the fresco technique because:
a. oil paint does not blend well on wall surfaces b. mosaics were unavailable during this period c. fresco forms a permanent bond with the wall d. Christians have used fresco since Egyptian times
A child has a history of recurring serious bacterial infections. A blood sample shows lymphocyte levels are a little below normal, and no antibodies to the pathogens are detected in serologic tests. Based on this information, which of the following is the likeliest diagnosis for this child?
A) Bruton-type agammaglobulinemia B) Grave's disease C) severe combined immune deficiency (SCID) D) systemic lupus erythematosus (SLE) E) hemolytic disease of the newborn