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TLS Online TPP Program

#Question id: 2582

Following statements are regarding to dynamics of actin filaments.

A. When the concentration of G-actin is above the Cc, the filament end will grow; when it is less than the Cc, the filament will shrink.

B. ATP–G-actin is added much faster at the (+) end than at the (−) end, resulting in a lower critical concentration at the (+) end than at the (−) end.

C. At steady state, actin subunits treadmill through a filament. ATP-actin is added at the (+) end, ATP is then hydrolyzed to ADP and Pi, Pi is lost, and ADP-actin dissociates from the (−) end.

D. ATP–G-actin is added much faster at the (-) end than at the (+) end, resulting in a lower critical concentration at the (-) end than at the (+) end.

E. At steady state, actin subunits treadmill through a filament. ATP-actin is added at the (-) end, ATP is then hydrolyzed to ADP and Pi, Pi is lost, and ADP-actin dissociates from the (+) end.

Which of the following statements are correct?

#Unit 2. Cellular Organization

  1. A, B and C

  2. B, D and E

  3. A, C and E

  4. A and D only

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TLS Online TPP Program

#Question id: 3839

#Unit 3. Fundamental Processes

Use the figure to answer the following question. In the late 1950s, Meselson and Stahl grew bacteria in a medium containing "heavy" (radioactive) nitrogen (15N) and then transferred them to a medium containing 14N (nonradioactive). Which of the results in the figure would be expected after one round of DNA replication in the presence of 14N?
TLS Online TPP Program

#Question id: 19235

#Unit 12. Applied Biology

A way by which specific foreign protein can be introduced into the chloroplast or mitochondrion.
TLS Online TPP Program

#Question id: 2507

#Unit 2. Cellular Organization

Differences in microtubular stability and function between different cells (or different locations within a cell) may be due to which of the following?

A. the expression of different tubulin isoforms

B. the number of protofilaments composing a single microtubule

C. the presence of different MAPs
TLS Online TPP Program

#Question id: 3533

#Unit 8. Inheritance Biology

What would be the frequency of dominant phenotype for all character individuals from a mating of two AaBbCc individuals?
TLS Online TPP Program

#Question id: 19057

#Unit 13. Methods in Biology

Which of the statements is correct about Gas chromatography?