Question

1 Secretory protein leave the cell by b Exoctossthey remain in the cytoplasm c) pinocytosis d) receptor mediated 2 If proteins lack a c) Ras d) Signal-recognition particle b) Sorting signal 3 What purpose does the protein coat serve a) Capture molecules to remain in the cytosol b) Shapes the membrane into a phospholipid bilayer membrane c) Provides extra protection and support to the organelles d) none of these are correct cells response to a signal can be fast if it a) 4 A involves change in gene expression b) To make a new protein Does not involve gene expression and synthesis of a new protein d) To make new enzymes 5. Cells can communicate with one another using a) Hormones ? b) Receptors 6. Vesicle docking depends c) local mediators d) all the above on which of the following proteins a) Tethering proteins b) Chaperone proteins Enzyme coupled receptors interact with GPCR a) True 7. b) False 8. As RTK bonds to its ligand, an intracellular signaling response develops when a) Tyrosine is phosphorylated b) Tyrosine is dephosphorylated c) Threonine is phosphorylated d) Threonine is dephosphorylated GPCR in eye cause the eye to: a) Respond to light quickly b) Respond to light slowly c) Have no effect on the eye d) GPCR are not present in the eye 9. 10. Phosphatases phosphorylate molecules b) false a) True 11. Which of the following choices concerning Tyrosine phosphate is true? a) Removes phosphate from serine b) Adds phosphate to serine c) Removes phosphate from tyrosine d) Adds phosphate to tyrosine 12. Kinases: a) b) Add a phosphate to a molecule Phosphorylates molecules d) More than one is correct 13. Ca concentration in an unstimulated cell is very high
Help with these bio questions please.Thank you

Answer 1

1)B) Exocytosis

Exocytosis – fusion with the cell membrane. Thus lumenal proteins are secreted extracellularly, and the membrane proteins will become cell membrane proteins.
Secretory vesicles – these stick around as vesicles in the cell until needed – where ‘needed’ means they do eventually undergo exocytosis. In neurons, this is where neurotransmitters are stored until an action potential demands their secretion into the synapse. In the stomach, the cells that produce gastric enzymes keep those enzymes in secretory vesicles until food intake triggers their release into the stomach.

2)a)Protein Translocator
. The signal recognition particle brings the ribosome to the endoplasmic reticulum membrane where it interacts with a specific receptor—the signal recognition particle receptor (or the docking protein). This interaction directs the polypeptide chain to a protein translocator. Once this has occurred the signal recognition particle, and its receptor is no longer required and is released. Protein synthesis now continues; and, as the polypeptide continues to grow, it threads its way through the membrane via the protein translocator, which acts as a channel allowing hydrophilic stretches of the polypeptide chain to cross.

3)b)Shapes the membrane into a phospholipid bilayer membrane

Cytoplasmic vesicle encapsulated by a protein coat. There are two types of coated vesicles, coated by coatamer and clathrin, respectively.
Coatamer: protein complex that encapsulates one class of coated vesicle. Formation of the coatamer coat on a previously flat membrane forces the membrane into a curved shape and therefore drives vesicle formation.
Clathrin: a protein that functions to cause vesicle budding in response to binding of specific ligand.

4)c) Does not involve gene expression and synthesis of a new protein.(fast cell response)
Example of a slow process:- Involves a change in gene expression to make a new protein.