Question

substances that are moved into the cell by endocytosis do not cross the membrane. select an answer and submit. for keyboard navigation, use the up/down arrow keys to select an answer. a true b false unanswered submit 1. draw a single phospholipids molecule and label the hydrophobic and hydrophilic portions of the molecule.

Explanation:

1. In endocytosis, substances are engulfed by the cell - membrane which forms a vesicle around the substance. The substance does not pass through the membrane in a traditional diffusion or transport - protein mediated way. So, the statement "Substances that are moved into the cell by endocytosis do not cross the membrane" is True.
2. A phospholipid molecule has a glycerol backbone, two fatty - acid tails (hydrophobic) and a phosphate - containing head group (hydrophilic). To draw it: Draw a small circle to represent the hydrophilic head and two long lines attached to the circle to represent the hydrophobic tails. Label the circle as "hydrophilic head" and the lines as "hydrophobic tails".

Answer:

1. a. True
2. Draw a small circle labeled "hydrophilic head" with two long lines attached to it labeled "hydrophobic tails".