The diagram below represents the structure of the plasma membrane. How would the exchange of molecules between an organism and its environment be affected if the membrane were less permeable? 1. Fewer membrane proteins would be needed to carry out active transport of nutrients.
2. Molecules needed for growth would have more difficulty diffusing across the membrane.
3. Organisms would be more susceptible to harmful substances crossing the membrane
4. The membrane would rearrange to form a single phospholipid later to transport materials

Imagine a person stepping on a pin and pulling his or her foot away. look at the reflex arc of this scenario below. which statement best describes the image? a)the sensory nerve carries the signal from the effector to the interneuron, and the motor neuron carries the signal to the receptor. b)the motor nerve carries the signal from the receptor to the interneuron, and the sensory neuron carries the signal to the effector. c)the sensory nerve carries the signal from the receptor to the interneuron, and the motor neuron carries the signal to the effector. d)the sensory nerve carries the signal from the receptor to the motor neuron, and the interneuron carries the signal to the effector.