1.1.2 - Cell Membranes (Communication and Cell Signalling) Part 9 Flashcards Preview

OCR Biology AS > 1.1.2 - Cell Membranes (Communication and Cell Signalling) Part 9 > Flashcards

Flashcards in 1.1.2 - Cell Membranes (Communication and Cell Signalling) Part 9 Deck (4):
1

Define the term 'cell signalling.'

Cell signalling - When cells communicate to each other via signal molecules.

2

  1. What helps cells detect hormones?
  2. How are cells able to detect that one hormone is different from another?

  1. On the cell surface membrane, there are receptors which detect for any hormones
  2. Receptors on the cell have a specific shape. They can only bind on to a specific hormone whose shape is complimentary to their own. The hormones' specific shape allows the receptors to tell them apart.

3

Describe how signalling molecules, such as a hormone, outside the cell carries out a response in the cell.

  • Proteins in the cell membrane act as receptors for these signalling molecules.
  • This means they have a specific shape that is complementary to the hormone they can detect and bind on to.
  • The signalling molecule binds on to the complementary receptors.
  • This triggers a response inside the cell.

4

HIV, which cause AIDs, can inffect humans because it can enter the cells of the immune system. Suggest how HIV can enter these cells.

HIV has a shape that can fit into one of the receptors on the cell surface, allowing it to enter and reproduce inside the cell.