For the
problem presented, the answer that would justify this statement is Apo-repressor
can only bind to the operator site of trp operon when a tryptophan molecule,
which is a co-repressor, binds to it. The correct answer between
all the choices given is the first choice or letter A. I am hoping that this
answer has satisfied your query about this specific question.
C) is the best answer because atmosphere deals with gases and hydrosphere deals with water.
Hope this helps... BTW you took out (water) in the question C
It didn't let me type my answer. Hope this helps!
The correct answer is: D) excited
A molecule is in an excited state when its energy level is higher than the ground state. That molecule stays in excited state for short time and then returns to a state with lower energy. This return to a lower energy level is described as decay and is the inverse process of excitation.
The transition from ground to excited state of an atom is possible if electrons gain energy that is higher than the difference in energies between the two energy orbits.
Answer:
air is drawn into the lungs
lungs expand
the muscles between the ribs contract to move the ribs up and down
air pressure in the chest cavity decreases
the diaphragm contracts and flattens
