#Question id: 7265
#Unit 5. Developmental Biology
Following statement regarding to the cascade of regulated RNA splicing controls drosophila sexual differentiation.
A. The Sex-lethal (Sxl)
protein, encoded by the sex-lethal gene, is the first protein to act in the
cascade and present only in female embryos.
B. Early in development, the Sxl gene is transcribed from a
promoter that functions only in male embryos.
C. Later in development, this male-specific promoter is shut
off, and another promoter for sex-lethal becomes active in both male and female
embryos.
D. In male embryos, however, in the absence of early Sxl
protein, exon 3 of the sex-lethal pre-mRNA is spliced to exon 2 to produce an
mRNA that contains a stop codon early in the sequence.
Which of the following is correct?
#Question id: 34171
#Unit 3. Fundamental Processes
#Question id: 10863
#Unit 10. Ecological Principles
According to the ____________ principle, two species with identical requirements for existence cannot coexist indefinitely
#Question id: 4301
#Unit 3. Fundamental Processes
Which of the following proteins prevents eukaryotic mRNAs from being recruited to the ribosome prior to egg fertilization
#Question id: 3003
#Unit 2. Cellular Organization
Which statement best characterizes the behavior of a bacterial culture during EXPONENTIAL GROWTH?