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TLS Online TPP Program

#Question id: 2473

A microtubule protofilament is formed by the:

#Unit 2. Cellular Organization

  1. lateral association of only gamma-tubulin subunits.

  2. head-to-tail association of only gamma-tubulin subunits.

  3. lateral association of tubulin dimers.

  4. head-to-tail association of tubulin dimers.

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TLS Online TPP Program

#Question id: 27377

#Unit 1. Molecules and their Interaction Relevant to Biology

Calculate the number of electrons, protons and neutrons in 1 mole of 16O−2 ions.
TLS Online TPP Program

#Question id: 33907

#Unit 2. Cellular Organization

A circular DNA molecule with 580,070 bp. Calculate the molecular weight and contour length (when relaxed) of this molecule. What is Lko for the Mycoplasma chromosome? If σ=-  0.06, what is Lk?
TLS Online TPP Program

#Question id: 809

#Unit 1. Molecules and their Interaction Relevant to Biology

A single-stranded DNA molecule contains 40 nucleotides with equal amounts of A, C, G, and T. This DNA strand can combine with a complementary DNA strand to form a double-stranded DNA molecule. Which of the following double-stranded DNA molecules would denature at a lower temperature than the 40 base-pair double-stranded molecule described above?
TLS Online TPP Program

#Question id: 6953

#Unit 5. Developmental Biology

Maternal factors are:
TLS Online TPP Program

#Question id: 3926

#Unit 3. Fundamental Processes

Positive regulation of a gene requires __.