1. Proteins Proteins are made of Amino Acid chains
Amino acids are linked in a sequence

2. Ribosomes Proteins are bonded together at the ribosomes # 2 on diagram

3. Sequence determines shape
Order of amino acid chain determines a proteins shape
Shape determines its function

4. Examples of Proteins have shapes Receptor molecules Nerve chemicals
Hormones
Enzymes
Proteins
have shapes

5. Receptor Molecules
Located on surface of membrane to receive signals from nerve chemicals or hormones

6. Receptor molecules Located on the surface of cells
on the cell membrane

7. 3-D view of receptor molecules
What kind of molecules are receptors?
Proteins

8. Cellular Communication
Receptor molecules are used so cells can interact

9. Receptor molecules are Proteins
They have a specific shape
Signals they receive must have a shape that can fit into them
Receptor
Signal

10. Primary Agents to Communicate
Hormones
Chemicals produced by nerve cells
Receptor molecule

11. Receptor and Hormone
Another pictorial example of a receptor molecule and a hormone

12. Hormones Signals released by glands so cell can communicate with
Hormone has to fit on receptor molecule of the target cell

13. Amino acid molecules are bonded together in a specific sequence on cell structures known as
1.ribosomes
2.vacuoles
3.mitochondria
4.centromeres

14. The shape of a protein is most directly determined by the
1.amount of energy available for synthesis of the protein
2.kind and sequence of amino acids in the protein
3.type and number of DNA molecules in a cell
4.mistakes made when the DNA is copied

15. A characteristic shared by all enzymes, hormones, and antibodies is that their function is determined by the
1.shape of their molecules
2.DNA they contain
3.inorganic molecules they contain
4.organelles present in their structure

16. Nerve cells are essential to an animal because they directly provide
1.communication between cells
2.transport of nutrients to various organs
3.regulation of reproductive rates within other cells
4.an exchange of gases within the body

17. Which substances are found on cell surfaces and respond to nerve and hormone signals?
1.starches and simple sugars
2.subunits of DNA
3.vitamins and minerals
4.receptor molecules

18. Letter B indicates a
1.ribosomes
2.receptor molecules
3.tissues
4.inorganic substances

19. Base your answer on the diagram and on your knowledge of biology.
Which statement best describes the diagram?
Nerve cell X is releasing receptor molecules.
Nerve cell Y is signaling nerve cell X.
Nerve cell X is attaching to nerve cell Y.
Nerve cell Y contains receptor molecules for substance A

20. Cellular communication is illustrated in the diagram below.
Information can be sent from
cell A to cell B because cell B is able to recognize signal 1
cell A to cell B because cell A is able to recognize signal 2
cell B to cell A because cell A is able to recognize signal 1
cell B to cell A because cell B is able to recognize signal 2
Cellular communication is illustrated in the diagram below.
Information can be sent from
1.cell A to cell B because cell B is able to recognize signal 1
2.cell A to cell B because cell A is able to recognize signal 2
3.cell B to cell A because cell A is able to recognize signal 1
4.cell B to cell A because cell B is able to recognize signal 2