#Question id: 5298
#Unit 8. Inheritance Biology
Four E. coli strains of genotype a+ b− are labeled 1, 2, 3, and 4. Four strains of genotype a− b+ are labeled 5, 6, 7, and 8. The two genotypes are mixed in all possible combinations and (after incubation) are plated to determine the frequency of a+ b+ recombinants. The following results are obtained, where M = many recombinants, L = low numbers of recombinants, and 0 = no recombinants. On the basis of these results, assign a sex type (either Hfr, F+, or F−) to each strain
#Question id: 28465
#Unit 5. Developmental Biology
Optic vesicle secrete two paracrine factor for the lens formation these signalling factor known as___
#Question id: 12007
#Unit 10. Ecological Principles
#Question id: 2265
#Unit 2. Cellular Organization
Passage through pores in the nuclear envelope is restricted primarily to
#Question id: 1459
#Unit 4. Cell Communication and Cell Signaling
Cells from advanced malignant tumors often have very abnormal chromosomes and an abnormal number of chromosomes. What might explain the association between malignant tumors and chromosomal abnormalities?