Testosterone is a lipid-based hormone; insulin is a ______-based hormone.
a. saccharide
b. protein
c. steroid
d. carbohydrate
Ans: b. protein
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Which of the following is true of introns?
A. RNA II polymerase transcribes the intronsequences along with exon sequences. B. More DNA of the human genome is devoted to exons than to introns. C. Introns are not found in bacteria or archaea, only eukaryotes. D. When annealing mature mRNA to corresponding chromosomal DNA sequences, the mRNA will form loops with intron sequences looped out.
The "high-mobility" of HMG proteins refers to their:
A. rapid movement from DNA sequence to DNA sequence. B. rapid electrophoretic mobility in polyacrylamide gels. C. abundant occupancy in chromatin. D. structural role in chromatin remodeling.
Which of the following is NOT true of the evolution
of infectious diseases? a. A species with a long history of being attacked by a specific pathogen has no resistance to that pathogen. b. The pathogens that leave the most descendants are the most successful. c. Species coevolve with common pathogens. d. It is better for the pathogen not to kill its host too fast. e. A pathogen needs access to energy and raw materials.
The process by which viruses can exchange genetic sequences to come up with a "new" virus such as H1N1 is:
A) reassortment. B) conjugation. C) independent assortment. D) recombination.