Practice Questions

TLS Online TPP Program

#Question id: 1104

Which of the following statements is true of signal molecules?

#Unit 4. Cell Communication and Cell Signaling

When signal molecules first bind to receptor tyrosine kinases, the receptors phosphorylate a number of nearby molecules.
In response to some G protein-mediated signals, a special type of lipid molecule associated with the plasma membrane is cleaved to form IP3 and calcium.
In most cases, signal molecules interact with the cell at the plasma membrane, enter the cell, and eventually enter the nucleus.
Protein kinase A activation is one possible result of signal molecules binding to G protein coupled receptors.

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TLS Online TPP Program

#Question id: 10950

#Unit 7. System Physiology – Animal

Presentation of antigen on MHC-I by a cell will result in

TLS Online TPP Program

#Question id: 3430

#Unit 11. Evolution and Behavior

The proximate causes of behavior are interactions with the environment, but behavior is ultimately shaped by

TLS Online TPP Program

#Question id: 5544

#Unit 5. Developmental Biology

Which embryonic membrane forms the commonly of the placenta?

TLS Online TPP Program

#Question id: 3660

#Unit 3. Fundamental Processes

Which of the following is true for exchange of homologous regions between two DNA molecules?

TLS Online TPP Program

#Question id: 16489

#Unit 12. Applied Biology

The beginning of animal tissue culture can be traced when Arnold showed that