Why are subcutaneous mycoses uncommon?
A) The human body is not a suitable habitat.
B) T cells are highly effective against fungus cells.
C) Injury is necessary to introduce the fungus into the tissue.
D) Only immunocompromised persons are susceptible to subcutaneous mycoses.
E) Saprobes do not grow well at body temperature.
C
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How do the genes in the ?-globin locus differ from each other?
A) They use different template strands for transcription. B) They are expressed at different times in development. C) They evolved from different ancestral genes. D) They are dispersed on different chromosomes. E) Some are expressed in all cells; others are expressed only in red blood cell precursors.
The rungs of the DNA ladder are formed by base pairs
a. joined by covalent bonds. b. joined by hydrogen bonds. c. joined by ionic bonds. d. NOT joined to each other
What is the first step in the production of a miRNA?
A. transcription from a nuclear gene B. cleavage to form a short double-stranded RNA C. infection with a virus D. design of an experimental treatment E. export of the pre-miRNA from the nucleus
The sunflower species Helianthus anomalus is thought to have been formed by hybridization between the sunflower species H. petiolaris and H. annuus because it contains a set of chromsomes from both parental species. H. anomalus is most likely an example of instantaneous speciation through
A. parthenogenesis. B. allopolyploidy. C. autopolyploidy. D. hybrid sterility.