NAD and NADP dependent dehydrogenases catalyze substrates by transferring ________ to  C-4 of NAD+ and NADP+.

#Question id: 1650

#Unit 4. Cell Communication and Cell Signaling

Recombination of V, D, and J Ig gene segments:

#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: 12683

#Unit 13. Methods in Biology

#Question id: 28482

#Unit 5. Developmental Biology

A cell become the trophoblast cells by the activation of the transcription of cdx2 gene, these cdx2 gene is regulated by which transcriptional factor? 

#Question id: 29068

#Unit 10. Ecological Principles

A positive correlation between population density over time and individual fitness is known as___