Which of the following statements about biomes, the major terrestrial ecosystems covering the Earth, is true?
A) Each of the nine major biomes is restricted to just one or two continents.
B) The major factors affecting the distribution of biomes are wind and sunlight.
C) Most biomes are characterized by a particular group of species.
D) Most natural biomes are unaffected by human activity.
E) Fire is very important in some biomes.
Ans: E) Fire is very important in some biomes.
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Which of the following is not a way nucleosome formation affects DNA?
A. compacts the DNA in the nucleus B. alters access to DNA by enzymes C. regulates the rate of DNA replication in mitochondria D. inhibits transcription by the internucleosome connections mediated by histone tails E. competes with transcription factor Sp1 to maintain transcriptional repression
Which assay is available to identify F. tularensis serologically?
a. Complement fixation b. Direct fluorescent antibody test c. Immunodiffusion assays d. Enzyme-linked immunosorbent assays (ELISAs)
The evolutionary ancestors of mitochondria are believed to have been ancient ____
a. Archaea b. cyanobacteria c. proteobacteria d. green bacteria e. Gram-positive bacteria
The two strands of DNA are:
A. Parallel and complementary B. Anti-parallel and complementary C. Parallel and identical D. Anti-parallel and identical