DNA microarrays have made a huge impact on genomic studies because they _____
A) can be used to eliminate the function of any gene in the genome
B) can be used to introduce entire genomes into bacterial cells
C) allow the expression of many or even all of the genes in the genome to be compared at once
D) allow physical maps of the genome to be assembled in a very short time
C
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Cells taken from a tumor
A. may be used to grow viruses. B. can be cultivated in vitro indefinitely. C. may be used to grow bacteriophages. D. divide 50 times and then die. E. may be used to grow viruses AND can be cultivated in vitro indefinitely.
In an atom, the electrons are
a. housed within the nucleus. b. moving through the nucleus. c. present in various energy shells. d. usually at rest, but occasionally move. e. positively charged.
The dark middle layer of the eye that prevents the scattering of light is the ____
a. fovea b. retina c. sclera d. choroid e. cornea
Gastrulation is the process by which an embryo becomes three-layered
____________________ Indicate whether the statement is true or false.