A mouse line that lacks a specific gene in order to study the effects of the absence of said gene is called called a(n) ________.
A) transgenic
B) chimera
C) knockout
D) clone
E) mosaic
C) knockout
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The episome in an Hfr strain is inserted near the trp (tryptophan operon) locus. This Hfr strain is grown with an F- Trp- strain. From this mating, we isolate an F+ Trp+ strain that can readily impart the Trp+ phenotype to F- Trp- strains, but no other traits are ever transferred. (When the original Hfr strain is mated with F? strains, traits other than Trp+ can be transferred, although at lower frequency than Trp+.) What most likely has happened?
A) An F? trp+ plasmid has been generated. B) Mutation occurred. C) Transduction occurred. D) Transformation occurred.
Which of the following produces the most ATP during aerobic respiration?
A. Substrate level phosphorylation B. Electron transport chain and chemiosmosis C. Glycolysis D. TCA cycle E. Fermentation
In a commensal relationship, the commensal benefits but the cohabitant is neither harmed nor benefited.
Answer the following statement true (T) or false (F)
Maria has been in labor for 12 hours, and her obstetrician thinks that it is time to artificially induce birth. What hormone will the physician inject?
A) prolactin B) estrogen C) vasopressin D) oxytocin