Which is the correct sequence of events during embryonic development?
(a) cleavage — differentiation — fertilization — gastrulation
(b) differentiation — fertilization — gastrulation — cleavage
(c) fertilization — cleavage — gastrulation — differentiation
(d) fertilization — differentiation — cleavage — gastrulation
(e) fertilization — gastrulation — differentiation — cleavage

What is the difference between the conducting zone and the respiratory zone of the respiratory system? the conducting zone is a series of cavities and tubes that move air to the respiratory zone where gases exchange with the bloodstream. the conducting zone exchanges gases between the lungs and the alveoli and the respiratory zone is a series of cavities and tubes that move air to the conducting zone. the conducting zone moves oxygen into the cells and the respiratory zone takes carbon dioxide away from the cells. the conducting zone moves oxygen into the bloodstream and the respiratory zone takes carbon dioxide away from the bloodstream.

Ras is a g-protein that is activated when a growth factor attaches to egfr. its activation results in the replacement of a gdp molecule with a gtp molecule, thus allowing a signal transduction pathway to be activated. considering the signal pathway illustrated on this page, what is one potential outcome of a mutation in the ras gene that leads to ras protein hyperactivity. be specific.

3test questions with answers on incomplete dominance