TLS Online TPP Program

#Question id: 1115


Which of the following is true during a typical cAMP-mediated signal transduction event?

#Unit 4. Cell Communication and Cell Signaling
  1. The second messenger is the last part of the system to be activated.

  2. A hormone activates the second messenger by directly binding to it.

  3. The second messenger amplifies the hormonal response by attracting more hormones to the cell being affected.

  4. Adenylyl cyclase is activated after the hormone binds to the cell and before phosphorylation of proteins occurs.

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TLS Online TPP Program

#Question id: 28758

#Unit 2. Cellular Organization

In which organelles, the terminal signal sequences which are used for targeting protein or import of the proteins are not cleaved the target sequences after import?

TLS Online TPP Program

#Question id: 28759

#Unit 2. Cellular Organization

C-terminal peroxisomal signal sequences used for importing into the peroxisomal matrix which involve___A_____ forms a multimeric complex with the _____B______receptor located on the peroxisomal membrane, according to figure A and B is?



TLS Online TPP Program

#Question id: 28760

#Unit 2. Cellular Organization

Pex5 is a receptor which binds with peroxisomal-targeting sequence proteins in the cytosol that protein targeted into the peroxisomal matrix by forming a multimeric complex with the Pex14 receptor located on the peroxisomal membrane. After assembly, the matrix protein dissociates from Pex5 and Pex5 is then returned to the cytosol by which process?

TLS Online TPP Program

#Question id: 28761

#Unit 2. Cellular Organization

Which of the following characteristics are TRUE for Lysosomes ?
a) Is a membrane-enclosed organelles
b) Is Filled with hydrolytic enzymes all are acid hydrolases 
c) Acid hydrolases they need to be activated by proteolytic cleavage
d) Work best at acidic pH

TLS Online TPP Program

#Question id: 28762

#Unit 2. Cellular Organization

For optimal activity, of lysosomal acid hydrolases they need to be___

a)Activation based on sensitivity to cleavage by endoglycosidase-D

b)Activation by proteolytic cleavage

c)Requires an acid environment

TLS Online TPP Program

#Question id: 28763

#Unit 2. Cellular Organization

Lysosome an interior pH of about_____