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3 Nov 2018

compare enzyme- linked receptors tp G protein - linked enzyme receptors. what are the advantages\ disadvantage of one to the other ? why would a G protin - linked enzyme rec- be used instead of an enzyme - linked receptor ?

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5 Nov 2018

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Select all the following that can be used to describe the sturcture of enzymes, the importance of the shape, and the relationship of enzyme shape and function.

Check all that apply.

1. Amino acids are linked by hydrogen bonds with various chemical groups attached to give enxymes their two dimensional shape.

2. Amino acids are linked by hydrogen bonds with various chemical groups attached to give enxymes their three dimensional shape.

3. Amino acids are linked by hydrogen bonds with various chemical groups attached to give enzymes their four dimensional shape.

4. Aminso acids are linked by peptide bonds with hydrogen bonds between nearby amino and carboxyl groups to give enzymes their two dimensional shape.

5. Amino acids are linked by peptide bonds with various chemical groups attached to give enzymes their four dimensional shape.

6. one or more polypeptide chains are folded and bond together in the fourth level of protein organization.

7. The shape of an enzyme determnes its function.

8. The number of amino acids in an enzyme determines its function.

9. The active sit binds with the substrate.

10. enzymes are substrate specific.

11. Alteration of active sites does not alter the enzymatic reaction.

During glycosylation

A) carbohydrates are attached to dolichol

B) an enzyme flips the molecule to the other side of the membrane

C) the carbohydrate chain is transferred to a protein

D) N-linked carbohydrates are attached to ser or thr

E) both A & D

F) both A & B

G) A, B, C

H) all of these

bluehyena977

The insulin receptor is a
a. phosphatase.
b. kinase.
c. phosphodiesterase.
d. cAMP molecule.
e. G protein.

What do the following receptors all have in common: G protein-linked receptors, protein kinases, and ion channels?
Select one:
a. Conformational change once the ligand is bound
b. Ligand binding
c. Amplification of the signal
d. All of the above

Diacylglycerol
Select one:
a. activates G proteins.
b. hydrolyzes phosphatidyl inositol-bisphosphate.
c. is released from the cell as a paracrine-signaling molecule.
d. opens Ca2+ channels.
e. activates protein kinase C

Gap junctions
Select one:
a. permit metabolic cooperation among linked cells.
b. are present on few copies per cell.
c. contain membrane lined bridges.
d. are channels about 1. 5 mm in diameter.
e. allow large molecules and ions to pass rapidly between cells.

Smooth muscle cells in the airways relax while those in the blood vessels contract in response to the hormone epinephrine. What would you expect to be different in these two types of cells exposed to epinephrine?
Select one:
a. Presence of epinephrine receptors.
b. Exposure to epinephrine released by neighboring cells.
c. Activation of protein kinases.
d. Rate of metabolism.
e. Types of proteins expressed.

The second messenger IP3
Select one:
a. is released from the cell as a paracrine-signaling molecule.
b. hydrolyzes phosphatidyl inositol-bisphosphate.
c. activates protein kinase C.
d. opens Ca2+ channels.
e. activates G proteins.

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compare enzyme- linked receptors tp G protein - linked enzyme receptors. what are the advantages\ disadvantage of one to the other ? why would a G protin - linked enzyme rec- be used instead of an enzyme - linked receptor ?

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