Which of the following requires the use of energy and the of transport proteins to move a molecule across a cell membrane?

Each cell's membrane contains the right mix of structures to help that cell keep its internal environment just ... Passive mechanisms like diffusion use no energy, while active transport requires energy to get done.

where are the choice's ??!!

Active Transport Apex

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thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.