The plasma membrane is composed of a layer of phospholipids. The ends of the phospholipids face the extracellular and intracellular sides. The ends of the phospholipids face each other and form the core of the membrane. The inner part of the membrane is . The polar regions of the phospholipids are . The proteins and phospholipids move laterally through the membrane.

2

Explanation:

because

1. double

2. polar

3. non-polar

4. hydrophobic

5. hydrophilic

6. can

Explanation:

3, 5, 1, 4, 2.

Explanation:

Neurons are the structural and the functional unit of the nervous system. Two main types of neurons on the basis of their function are sensory neurons and motor neurons.

The motor control in order body occurs in a sequential step. The motor program is selected by the pre motor cortex. This neuron is further stimulated by basal nuclei of the thalamus. This further stimulate the lower motor neuron. This causes the contraction in the skeletal muscle. This information is further move to cerebellum if movement is required.

Thus, the correct order is 3, 5, 1, 4, 2.