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QUESTION 1:
An Hfr strain is used to map three genes in an interrupted matingexperiment. The cross is Hfr/a+ b+ c+ rif X F-/a- b- c- rifr. (Nomap order is implied in the listing of the alleles; rifr isresistance to the antibiotic rifampicin.) The a+ gene is requiredfor the biosynthesis of nutrient A, the b+ gene for nutrient B, andthe c+ for nutrient C. The minus alleles are auxotrophs for thesenutrients. The cross is initiated at time = 0, and at varioustimes, the mating mixture is plated on three types of medium. Eachplate contains minimal medium (MM) plus rifampicin plus specificsupplements that are indicated in the following table. )The resultsfor each time interval are shown as the number of colonies growingon each plate.) Time of InterruptionSupplements Added to MM 5 min 10 min 15 min 20 minNutrients A and B 0 0 4 21Nutrients B and C 0 5 23 40Nutrients A and C 4 25 60 82Based on these data, determine the approximate location on thechromosomes of the a, b and c, genes relative to one another and tothe F factor.Choose one answer. 1. c a b F 2. a b c F 3. F a b c 4. F b a c 5. b a c F
QUESTION 2:
Two Theoretical genetic strains of a virus (a- b- c- and a+ b+c+)were used to simultaneously infect a culture of host bacteria.Of the 10,000 plaques scored, the following genotypes wereobserved. Determine the genetic map of these three genes on theviral chromosome. Decide whether interference was positive ornegative.a+ b+ c+ 4100 a- b+ c- 160a- b- c- 3990 a+ b- c+ 140a+ b- c- 740 a- b- c+ 90a- b+ c+ 670 a+ b+ c- 110Choose one answer. 1. a b c, positive 2. b a c, negative 3. c a b, positive 4. a c b, negative 5. a c b, positive
The lycophytes, sphenophytes, and ferns were once the giants of the plant kingdom and dominated the landscape. Explain why they are presently restricted to certain habitats and are relatively small in stature.
Explain the view of evolution put forth by Georges Cuvier. What was the term he used? How did Charles Lyell and James Hutton influence Darwin on hisvoyage?
What is the frequency of heterozygotes (Aa) in a population in which the frequency of all dominant phenotypes is 0.25 and the population is in H-W equilibrium?
In skeletal muscle, which statement is NOT accurate regarding the regulation of glycogen metabolism?
Functionally, what is the muscle fiber's fundamental unit of contraction?
what does TCA cycle respons.
Explain the large picture of how the nervous and other systems of the body is able to control the day-to-day beatingoperation of the heart. Research the internet to determine why this system occasionally breaks down.
discuss your opinion in 350- to 700- words of the appropriateness of health care transparency it may be helpful to
The nematocyst is a morphologically and functionally complex structure. Through what process are nematocysts formed by the cnidoblasts?
Which of the following best describes the process of gas exchange in insects?
SNAREs exist as complementary partners that carry out membrane fusions between appropriate vesicles and their target membranes. In this way, a vesicle with a particular variety of v-SNARE will fuse only with a membrane that carries the complementa..
select a health care career within the managed care organization pharmaceutical company research organization college
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