Chapter 7 Textbook Q's

Question 1

The difference between pinocytosis and receptor-mediated endocytosis is that ________.

Answer 1

pinocytosis is a non-selective process, taking in extracellular fluid with dissolved molecules indiscriminately, while receptor-mediated endocytosis is highly selective, only bringing in specific molecules that bind to dedicated receptors on the cell membrane; essentially, pinocytosis “drinks” fluid, while receptor-mediated endocytosis actively targets specific substances.

Question 2

In animals, the protein ____ gives the tissues strength and structural integrity. This function is performed by the _______ in plant cells.

Answer 2

collagen; cell wall

Question 3

In ___ transport, the molecules move against a concentration gradient. Whereas, in _____ transport, the molecules move along the concentration gradient.

Answer 3

active; passive

Question 4

How does a big difference in the concentration gradient affect the diffusion rate?

Answer 4

It increases the rate of diffusion