Soils developing from sand and silt carried by the wind are referred to as
A) till.
B) eolian.
C) colluvium.
D) fluvial.
B
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Variations in the timing of master gene expression during embryonic development in vertebrates is responsible for
____.
a. mitochondrial DNA expression b. protein synthesis c. differences in adult body form d. development of vestigial structures e. brain development
The first system to develop in the vertebrate embryo is the:a
circulatory system. b. digestive system. c. excretory system. d. reproductive system. e. nervous system.
Which one of the following statements about RNA processing is true?
A) Exons are cut out before mRNA leaves the nucleus. B) Ribozymes may function in RNA splicing. C) RNA splicing can be catalyzed by tRNA. D) A primary transcript is often much shorter than the final RNA molecule that leaves the nucleus.
Which of these is not a common concern about genetically modified food crops?
A) They may have unintended negative effects on surrounding organisms. B) They may cause the evolution of pesticide-resistant crop pests. C) They may cause a reduction of genetic diversity among food crops. D) They may increase the number of human infections by transgenic E. coli. E) They may cause unforeseen allergies in those who consume the genetically modified food.