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QUESTION 4 the rate of osmosis. An increase in temperature will a. increase b. decrease c. not affect QUESTION 5 the rate of osmosis. An increase in concentration gradient will a. increase b. decrease c. not affect QUESTION 6 Cell membranes are comprised of phospholipid molecules, which have a phophate "head" and lipid "tails". The lipid "tails" are: a. Isotonic b. Hydrophilic c. Hydrophobic d. None of the above

Answer 1

4)

The correct option is a - increase

Osmosis is a type of diffusion. Osmosis is the movement of solvent particles (water molecules) through a semipermeable membrane from an area of high concentration to an area of low concentration. Temperature is directly proportional to the rate of osmosis. An increase in temperature causes an increase in the rate of osmosis. When temperature increases, the molecules obtain energy and result in the faster movement of molecules through the semipermeable membrane. Hence, the rise in temperature causes an increase in the rate of osmosis

5)

The correct option is a - increase

The concentration gradient is the difference in the concentration of ions in one area to another. The concentration gradient is directly proportional to the rate of osmosis. A higher difference in concentration causes the molecules to move faster. The rate of osmosis increases as the concentration gradient increases

6)

The correct option is c - hydrophobic

Phospholipids are mostly found in the plasma membrane. Phospholipids molecules have a phosphate head and two fatty acid tails. Phospholipid head is polar and phospholipid tails are non-polar. The polar head is hydrophilic and attracted to water. Non-polar tails are hydrophobic and are repelled by water (not attracted to water). Phospholipid tails are water-fearing.