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A three-factor cross in Salmonella typhimurium was performed using bacteriopage P22. The cross between an arg-leu-his- recipient bacterium and bacteriophage P22, which was grown on an arg+leu+his+ strain. 1000 arg+ transductants were selected and tested on several selective media by replica printing. The following results were obtained:
Arg+leu-his- 583
Arg+ leu- his+ 300
Arg+ leu+ his+ 114
Arg+ leu+ his- 1
What is the order of the three markers?
What are the contransduction frequencies?
Discuss persistence hunting and how it explains form/function of early Homo species.
A section of the E. coli genome that encodes the pheM protein. Write out and label: the reverse complement, the mRNA sequence.
Discuss similarities and differences of the enzymes catalase, superoxide dismutase, & superoxide reductase from the following points of view
For dialysis membranes the Lp was determined to be 6.34*10^-7 cm min^-1 mmHg-1 . A cylindrical hole 1 cm in diameter was cut in tow lexan pieces that were then bolted together with the membrane in.
The DNA molecule is permitted to replicate in a solution containing all four unlabeled deoxyribonucleoside tripohosphates and deoxyadenosine triphospage that is labeled with 32P.
DNA microarray analysis of patterns of mRNA abundance in different human cell types shows that the level of expression of almost every active gene is different.
You are studying a species of desert-dwelling fish that consists of only 2 populations, each located in a different canyon. Population A is consists of approximately 3000 breeding adults and population B.
In peas, green pods (Y) are dominant to yellow pods (y), and inflated pods (P) are dominant to pinched pods (p). A cross between green, inflated plants and yellow.
Each olfactory receptor gene is involved in detecting specific odors. However, humans are losing OR genes, while mice and other mammals have ~ 1500 such gene.
Which of the following statements reflects gene density.
What is the difference between an intermediate host and a definitive host? Identify each host in the life cycle of the causative agent of malaria?
What is a main property of DNase that makes it useful for assessing whether chromatin is in a closed (tightly condensed) or open (loosely packed) configuration.
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