In almost all organisms that have been studied, the genes in Hox clusters:
A. are arranged on chromosomes in the
same order as their products function along
the anterior-posterior segments of the
embryo.
B. are expressed in a sequence that is
independent of their linear organization along
the chromosome.
C. each contain a unique homeodomain, the
the products of which are very different
among organisms.
D. are arranged on the chromosomes in a
sequence that is independent of the order in
which their products function along the
anterior-posterior axis of the embryo.
E. None of these choices are correct.
A
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The Ames test
A. is used to measure levels of oxygen free radicals. B. is used to measure the repair of thymine dimers. C. can be used to measure the mutagenicity of chemicals. D. None of the choices are correct.
Based on hierarchical classifications and features, which statement about humans is true?
a. Humans are deuterostomes. b. Humans are acoelomates. c. Humans are diploblasts. d. Humans are asymmetrical.
Which of the following evolve?
a. populations b. genera c. kingdoms d. populations and genera e. genera and kingdoms
Quaternary ammonium compounds ("quats") are used for
A. antisepsis. B. disinfection. C. sterilization. D. quantifying antimicrobial activity. E. both antisepsis and disinfection.