The two strains a and b are tested for being auxotrophic for the following nutritional mutations: pyridoxine (pdx), biotin (bio), methionine (met), adenine (ade), and para-aminobenzoic acid (pab). Growth is indicated by ( + ) and lack of growth by ( - ). From these tests, what is genotype of strain a and b respectively (+ indicate prototroph while other auxotroph)? 

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#Question id: 2041

#Unit 4. Cell Communication and Cell Signaling

Function of Properdin

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#Question id: 242

#Unit 1. Molecules and their Interaction Relevant to Biology

Cells fed5-methyl uracil (radioactive in the methyl group) will form radioactive ________.

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#Question id: 26541

#Unit 3. Fundamental Processes

Which of the following activities are found in TFIIH  

a. ATPase

b. helicases

c. kinase

d. Ubiquitinylate

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#Question id: 28294

#Unit 5. Developmental Biology

Which enzyme is responsible for harden of the vitelline envelope and convert it into fertilization envelope?

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#Question id: 18081

#Unit 8. Inheritance Biology

The interaction of selection and inbreeding in determining the incidence of autosomal recessive diseases. Consider a gene in which recessive mutations occur at a rate of 10^-5. Assume a selective disadvantage S of 0.4 in homozygotes for the recessive allele. What is the frequency of the recessive allele (q). And calculate the incidence of the disease. Assume random mating.