A nonliving acellular structure that contains DNA is a
A. nucleus.
B. virus.
C. protein.
D. cell wall.
B. virus.
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Which of the following statements is FALSE?
A. Chemical reactions proceed more quickly at higher temperatures. B. Chemical reactions progress at a faster rate when the reacting particles are present in higher numbers. C. Larger particles move faster than smaller ones and thus collide more frequently and more forcefully. D. Catalysts increase the rate of chemical reactions, sometimes while undergoing reversible changes in shape.
The mRNA that would most likely have the longest half-life would:
A. containan exon junction complex bound downstream of a stop codon. B. lack a stop codon. C. containan AU-rich element in the 3'-UTR. D. containone or more hairpin structures.
In DNA sequence analysis
A. the + strand of DNA is used. B. the start codon is ATG. C. ORFs are searched for. D. codon usage is a helpful indicator for protein coding areas. E. All of the choices are correct.
Modern humans evolved in ___ about ___
years ago.
a. Africa...43,000 b. Africa...200,000 c. Africa...2,000,000 d. Asia...43,000 e. Asia...200,000