Molecular Biology Answers

what is the better definition of regulative development of cell in early embryo?

a) the ability to regulate up/down the cell number in the early stage embryo
b) development proceeding in a regulative path and inflexible path

which is true? (may have more than 1 answers)

a) in c.elegans development, when Abala cell is killed by laser ablation, the Abarp cell regulates so that anterior pharynx tissues are still able to form and total number of cells from AB lineage is same as in normal development

b) the mutation or knockout of Abdominal A gene in drosophila so that all cells in that segment adopts the T4 fate is an example of regulative development

c) normal development continues in the remaining 7 cells after removal of a single cell from an 8 cell mouse embryo

d) when the AB cell from a 2 cell c.elegans embryo is removed, the P1 cell regulates to form the posterior pharynx

e) none of the above is an example of regulative development

Are each of these statements true?

a) there are forty seven cells from D lineage of c.elegans
b) there are thirty four cells from E lineage of c.elegans

Protein a regulates the expression level of protein B through a linear transduction pathway containing 8 activation events and 3 repression events. select the 2 most reasonable assumptions?

a) increased expression of A will activate expression of B
b) increased expression of A will inhibit expression of B
C) decreased expression of A will inhibit expression of B
d) decreased expression of A will activate expression of B
e) decreased expression of A will modulate expression of B in some way but it is difficult to reliably predict what will happen if the expression of A is increased due to complexity of this pathway.