Heinz Fraenkel-Conrat induced point mutations in the genes encoding coat proteins of TMV and looked for changes in the resulting proteins
By examining the effect of single-base changes in the mRNA on the amino acid sequence, Conrat proved that __________. A) the genetic code is overlapping
B) the genetic code is nonoverlapping
C) the genetic code is redundant
D) there are 20 amino acids
E) the genetic code is triplet
B
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A classification system based on mutual similarity that involves comparing as many characteristics as possible is called a ________ system.
A. phenetic B. determinative systematic C. phylogenetic D. phyletic
Which of the following lists of features exemplifies the domain Archaea?
A. Multicellular, varying branched lipids in their cell membrane, no nuclear envelope, and contain some introns B. Unicellular, unbranched phospholipids in their cell membrane, no nuclear envelope, and contain some introns C. Unicellular, varying branched lipids in their cell membrane, nuclear envelope, and contain some introns D. Unicellular, varying branched lipids in their cell membrane, no nuclear envelope, and contain some introns
Jane and Tom are worried about their newborn baby who has just begun to nurse, but chokes and turns blue whenever she is fed. Their baby most likely has a defect in her ________.
A. tongue muscles B. muscle in the lower two-thirds of her esophagus C. soft palate D. muscle in the upper-third of her esophagus E. epiglottis
An infectious disease that is reported occasionally at irregular intervals in random locations is
a. endemic b. sporadic c. spontaneous d. rare