When a transgene is used in mice to knock out a specific function, two problems that might occur are the unintended introduction of multiple copies or abnormal gene expression. The second of these problems is related to __________
A) position effect
B) homologous recombination
C) vector insufficiency
D) mitotic recombination
E) unequal crossing over
A
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Bdellovibrio species are ________ cells that replicate in the ________
A) symbiotic / gills of clams B) lithotrophic / deep subsurface C) predatory / periplasmic space D) denitrifying / sediments of freshwater lakes
Contact inhibition is best explained by which of the following statements?
a. Contact between neighboring cells triggers reactions leading to inhibition of mitosis. b. As neighboring cells become more tightly packed together, their size is restricted and cytokinesis can no longer occur. c. As cell number increases, the protein kinases they produce compete with neighboring cells, inhibiting mitosis. d. As cell number increases, the level of waste products increase, consequently slowing metabolism leading to mitosis. e. As cell number increases, size restrictions inhibit protein synthesis.
An infection acquired by a hospitalized patient that was not present when he or she was admitted into the hospital is referred to as which of the following?
A. an autonomous infection B. a nosocomal infection C. an opportunistic infection D. septic introduction
Which of the following may characterize monosaccharides?
A. An amino group B. An amide group C. A backbone of eight carbon atoms D. One carbonyl group E. The presence of glycerol and fatty acids