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TLS Online TPP Program

#Question id: 1393

In research on aging (both cellular aging and organismal aging), it has been found that aged cells do not progress through the cell cycle as they had previously. Which of the following, if found in cells or organisms as they age, would provide evidence that this is related to cell signalling?

#Unit 4. Cell Communication and Cell Signaling

  1. Growth factor ligands do not bind as efficiently to receptors.

  2. Hormone concentrations decrease.

  3. cAMP levels change very frequently.

  4. Enzymatic activity declines.

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TLS Online TPP Program

#Question id: 2934

#Unit 2. Cellular Organization

Cyclin D/Cdk4 functions during:
TLS Online TPP Program

#Question id: 2935

#Unit 2. Cellular Organization

Breakdown of the nuclear envelope during mitosis is accomplished by CDK-dependent phosphorylation of lamins:
TLS Online TPP Program

#Question id: 2936

#Unit 2. Cellular Organization

The stable attachment of sister kinetochores to microtubules emanating from opposite spindle poles is called:
TLS Online TPP Program

#Question id: 2937

#Unit 2. Cellular Organization

Separase initiates sister chromatid segregation at anaphase by cleaving:
TLS Online TPP Program

#Question id: 2938

#Unit 2. Cellular Organization

Which of the following inhibit(s) cyclin A/Cdk2 activity?
TLS Online TPP Program

#Question id: 2939

#Unit 2. Cellular Organization

Failure of which cell-cycle checkpoint is most likely to result in non-dysjunction?