The end result of cleavage is a
a. blastula.
b. gastrula.
c. zygote.
d. embryo.
e. mesoderm
A
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PCR uses two components: ____________________ that serve as templates and primers that bind to regions on either side of the template to be copied
a. yeast artificial chromosomes b. tRNA that has been cut by restriction enzymes c. mRNA that has been cut by restriction enzymes d. double strands of DNA e. single strands of DNA
In the whole-genome shotgun method, the genome is fragmented and individual fragments are sequenced. How is the
order of the nucleotides determined for the original intact chromosome?
a. The fragmentation is done in a systematic way such that the physical arrangement of fragments is readily apparent. b. The random fragmentation produces overlapping sequencesthat can be aligned and assembled to generate the original intact DNA molecule.
c. We supplement our information with data from a different technique to determine the final chromosome arrangement. d. DNA hybridization assays are conducted to determine the physical arrangement of the genes on the chromosome. e. After sequencing, the fragments are labeled and used as probes in a microarray.
You notice a sign in a public restroom that states "Sanitized for your safety." This means
A) sterilizing chemicals have been used in cleaning. B) antiseptics have been used to clean the area. C) degerming methods only have been used to clean the restroom. D) methods of disinfection that meet minimum standards of microbial removal have been used. E) only "organic" chemicals were used in the cleaning process to reduce microbial numbers.
Ascaris lumbricoides
A. spreads to humans by ingestion of Ascaris eggs in food. B. is an intestinal roundworm. C. larvae migrate to the pharynx, get swallowed, and return to intestines to mature. D. larvae penetrate into lymphatics and capillaries around intestines. E. All of the choices are correct.