A C. elegans mutant has a mutation in LIN-12/Notch that prevents its cleavage by the protease that acts in this pathway. The vulva cells in these mutants would likely develop with three primary (1˚) cell fates and no secondary (2˚) cell fates.

A group of first year college students visiting Lake Itasca for Nature of Life identify a new species of nematode, C. itascasis. It has a cell (Cell X) in the general near the vulva that the students hypothesize might be analogous to the Anchor Cell in C. elegans development. What would be the best experiment to do to test whether Cell X has the same function as the anchor cell in C. elegans?

You have identified a new pair rule Gene in Drosophila. The best way to begin to understand its regulation by gap genes would be to:

The image above illustrates the fates of the posterior daughters of P cells in C. elegans, some of which give rise to the vulva. Identify which cells are expected to express the let-23/EGFR, and explain why.

SKN-1 protein is maternally provided to unfertilized oocytes an is not asymmetrically localized. Yet, SKN-1 is only required for one of the four blastomeres present at the 4-cell stage shown above. A. (4 pts) Identify the blastomere whose fate depends on SKN-1 activity and Explain how activity of this maternally supplied SKN-1 protein becomes restricted to that blastomere. Be sure to include discussion of other key proteins. B. (2 pts) State and explain the phenotype that results from lack of SKN-1 protein.

Which factor accounts for the most variation in meeting a child’s total caloric needs?

A child who sustained a hard bump to their head and has unequal pupils should be treated for: 

Which statement about fat is true?

Asking families to transport groups of children for field trips can present serious legal problems for a program in the event of an accident.

Briefly explain teachers’ professional responsibility in the event that a child sustains a serious injury.