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TLS Online TPP Program

#Question id: 5768

Exposure to gamma radiation leads to severe damage to DNA.  The bacterium Deinococcus radiodurans is able to survive exposure to levels of gamma radiation that would kill any other known organism.  This organism is able to survive because

#Unit 8. Inheritance Biology

  1. it is covered with a very thick cell wall that blocks radiation

  2. it produces its own mutagens that quickly revert mutations that result from radiation exposure

  3. it has several very efficient DNA repair systems

  4. it has hundreds of copies of its chromosome so it has a good chance of at least one surviving

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TLS Online TPP Program

#Question id: 24674

#Unit 2. Cellular Organization

 Membrane lipids may
a. spontaneously flip-flop from one membrane leaflet to the other.
b. move laterally within one membrane leaflet.
c. aggregate with membrane proteins to form lipid rafts.
d. be unequally distributed in the two membrane leaflets.
e. be present in varying amounts in different cellular membranes
TLS Online TPP Program

#Question id: 28196

#Unit 5. Developmental Biology

 the tissue that produces a signal that changes the cellular behavior of the other tissue is called___
TLS Online TPP Program

#Question id: 1326

#Unit 4. Cell Communication and Cell Signaling

Which cellular junction will be most useful in preventing the movement of material between cell membranes?
TLS Online TPP Program

#Question id: 28039

#Unit 1. Molecules and their Interaction Relevant to Biology

Proteins particularly those with molecular masses >100 kD, consist of more than one polypeptide chain. These polypeptide subunits associate with a specific geometry. The spatial arrangement of these subunits is known as 
TLS Online TPP Program

#Question id: 19903

#Unit 12. Applied Biology

The capacitive sensors used to measure __________________ ?