Exceptions to the genetic code have been identified. Which one of the following is a known exception?
A. A codon might not always encode the same amino acid.
B. A single stop codon, UGG, may be the only stop codon recognized.
C. Alanine codons instead of methionine codons may be used for the initiation of translation.
D. The codons in mitochondria are reversed (e.g., instead of AUG, the methionine codon in mitochondria is GUA).
A
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Which of the following linkages would you expect to find at a branch point in glycogen or amylopectin?
A) ?-1,4-glycosidic linkage B) ?-1,4-glycosidic linkage C) ?-1,6-glycosidic linkage D) ?-1,6-glycosidic linkage
Two common transposable elements associated with interspersed repeated DNA are ________ and ________.
Fill in the blank(s) with the appropriate word(s).
The tetracyclines interfere with
A) protein synthesis. B) cell wall synthesis. C) cell membrane component synthesis. D) nucleic acid synthesis. E) folic acid synthesis.
Certain complement proteins kill foreign microbes by
A. inactivating their ribosomes. B. destroying their nucleic acids. C. creating interferon. D. causing them to burst. E. agglutinating them.