Question

TRUE OR FALSE

1. For facilitated diffusion to occur there needs to be a protein in the cell membrane

2. Ions like Na⁺ and K⁺ can easily move across the cell membrane

3. Cells may have a cell membrane and not cell wall

4. An atom with 17 electrons meets the octet rule

5. Attaching to the allosteric site of an enzyme means that inhibitor molecules will increase the Km in an enzymatic reaction

Answer 1

Answer 1 : True

Facilitated diffusion occurs through Transmembrane proteins which are embedded in the cell membrane. This process is usually required to transport larger molecules in and out of the cell Or smaller molecules against the concentration gradient. This process usually requires energy.

Answer 2 : True

Ions like Na+ and K+ are smaller molecules and with the concentration gradient they can pass through the cell membranes in either direction. However, when required, these are also transported against the concentration gradient by facilitated diffusion. For example, Na+/K+ ATPase pump

Answer 3 : True

Animal cells have cell membrane but no cell wall whereas plant cells have both cell membrane and cell wall.

Answer 4 : False

An atom with 17 electrons does not complete an octet. The l, m, n, orbits of this atom will be filled as 2, 8, 7. To complete an octet, this atom requires one more electron.

Answer 5 : True

There are 2 types of allosteric inhibitors, K-class and V-class. One affects the Km whereas the other affects the Vmax.