The use of recombinant DNA technology to treat genetic diseases ("gene therapy") has been held back by difficulty
A) delivering cloned genes into target cells and getting the genes to function properly.
B) in obtaining the appropriate sequence information from individual people.
C) cloning human genes.
D) in identifying human genes that cause disease.
E) cloning and identifying human genes that cause disease.
Answer: A
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The most plausible explanation for the high number of spiders in plot 4 is:
A. there are too many flies overall. B. there are no centipedes to prey on the spiders and there are abundant flies upon which to feed. C. the spiders preyed on the centipedes and ignored the flies. D. the flies and spiders worked together to eliminate the centipedes.
During the 1960s and 1970s, ecologists emphasized competition as the primary factor structuring communities
Indicate whether the statement is true or false.
Where does production of asexual spores in ascomycetes often occur?
a. on sporangia b. on zygospores c. on conidiophores d. on basidia
Prokaryotes reproduce by ___________, which creates _____ exact daughter cell clone(s) of the original parent cell.
a. trinary fission; three b. sexual fission; one c. binary fission; two