A DNA barcode is being developed for use in conservation biology based on ____
a. mitochondrial genes in plants
b. chloroplast genes in plants
c. nuclear genes in animals
d. mitochondrial genes in animals
e. bacterial genes
ANSWER: d
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Which group in a food web is responsible for returning inorganic compounds back to the environment?
A. tertiary consumers B. decomposers C. primary producers D. primary consumers E. secondary consumers
An electron microscope uses ________ lenses to focus beams of electrons onto a specimen.
Fill in the blank(s) with the appropriate word(s).
What legal restrictions on the use of PGD are in place in the United States?
A. It has been banned across the board. B. It can only be used to prevent implantation if the disease diagnosed has a 100 percent chance of occurring with the genotype revealed. C. It cannot be used for sex selection. D. It cannot be used for screening embryos to be tissue donors. E. None of these are legal restrictions currently in place in the United States.
In most women's menstrual cycles, ovulation occurs
A. at the onset of the flow. B. halfway through the cycle. C. just after sexual intercourse. D. just following the last cycle.