Practice Questions

TLS Online TPP Program

#Question id: 7246

Treatment of Xenopus embryos with lithium dorsalizes the embryos by interfering with cell-cell signaling pathways. What, if anything, is the effect of lithium on hydra, and what might we infer about its mechanism of action?

#Unit 5. Developmental Biology

Lithium has no effect in hydra
Lithium dorsalizes hydra just as it does Xenopus, so we would assume its mechanism of action is identical in the two organisms
Lithium causes the formation of extra basal discs, which we might infer arise through interference with cell-cell signaling pathways
Lithium causes the formation of extra head regions, since the head of hydra is mechanistically analogous to the dorsal side of Xenopus embryos

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TLS Online TPP Program

#Question id: 8715

#Unit 9. Diversity of Life Forms

Which of the following items is most likely to form a simple linear relationship with the number of gene-duplication events, when placed as the label on the vertical axis of the following graph?

TLS Online TPP Program

#Question id: 1350

#Unit 4. Cell Communication and Cell Signaling

The addition of a peptide with an RGD sequence would probably ? the binding of cultured cells to a collagen-coated or laminin-coated dish.

TLS Online TPP Program

#Question id: 31397

#Unit 2. Cellular Organization

Which of following sorting signal, CFTR protein contains that binds to the Sec24 subunit of the COPII vesicle coat and is necessary for transport of the CFTR protein out of the ER?

TLS Online TPP Program

#Question id: 21813

#Unit 12. Applied Biology

Which one of the following sensors measures acceleration and vibration?