Some mice, known as ________ mice, are genetically bred to be missing particular genes.
Fill in the blank(s) with the appropriate word(s).
knockout
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The number of chromosomes in diploid eukaryotic cells
A. is 46. B. changes as each organism grows and ages. C. can be predicted by the size of the organism. D. varies considerably from 2 to over 1000 in different species.
A technique used to amplify a desired piece of DNA is
A. gel electrophoresis. B. RFLP. C. PCR. D. Northern Blot. E. plasmid replication.
During inhalation, air flows into the lungs because
A. the surfactant in the lungs "draws" in air because of its adhesive properties. B. air pressure is greater outside the body than in the lungs and naturally flows inside once the chest has expanded. C. the strong chest muscles are sucking in air. D. air moves passively in and out of the lungs through time.
Figure 1.3
In Figure 1.3, illustrating the levels of life's organization, what is represented in frame 3?
A. Atom B. Tissue C. Molecule D. Organ E. Cell