In what sense is the genetic code nearly universal?
a. All organisms on Earth share in common approximately 85 percent of their DNA sequence.
b. The genetic code has its origin in meteorites from distant regions of interstellar space.
c. Nearly every possible combination of codons occurs in each organism’s chromosomes.
d. Specific mRNA sequences generate the same proteins in nearly all known organisms.
d. Specific mRNA sequences generate the same proteins in nearly all known organisms.
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What is found in the central cavity of an adult long bone?
a. red marrow b. yellow marrow c. calcium deposits d. collagen e. spongy bone tissue
The Greek terms for "small" and "ball" are the root words for
A. microsphere. B. liposome. C. polymer. D. proteinoid. E. coacervate.
The majority of mature, self-tolerant lymphocytes are found in
A) the MALT. B) lymph nodes. C) the thymus. D) the spleen. E) the tonsils.
Genetic regulation in bacteria can involve alterations in RNA secondary structure. What phenomenon occurs in the trp operon that involves such alterations?
A) transcription B) intron processing C) attenuation D) polyadenylation of the 3? end of the mRNAs E) capping