Apoptosis is used in humans in order to eliminate cells infected by viruses, cells that are worn out, and those that have the potential to cause cancer.
Answer the following statement true (T) or false (F)
True
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Sxl protein mediates differential expression of genes further downstream in the developmental pathway
In females, active Sxl protein produced from Pm leads toproduction of proteins that facilitate female development—first Tra protein, which then, with Tra-2, facilitates splicing of the mRNA for active Dsx protein. In males: A. the absence of Sxl leads to a different splicing pattern of tra transcripts; a different version of Dsx isproduced that leads to male development. B. transcription from promoter Pe results in acharacteristic splicing pattern and the production of a burst of active Sxl protein. C. only stop codons are recognized, leading to splicing of Tra and overactivity of SxI. D. the start codons are preferentially removed in splicing, causing a premature termination of Dsx translation leading to male development.
In your Drosophila laboratory, you find a larva that is missing segments Lb, T1, T2, and T3. This larva probably has a mutation in a ___________ gene.
A. pair-rule B. gap C. maternal effect D. segment-polarity E. gap or segment-polarity
You are studying cell cycle progression in yeast cells. If you could prevent cdc2 from associating with the mitotic cyclin, the cells would:
A. arrest in G2. B. arrest in S. C. arrest in prometaphase. D. arrest in metaphase. E. arrest in G1.
Describe the modifications seen in birds for flight. Include modifications in as many body systems as
possible. What will be an ideal response?