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TLS Online TPP Program

#Question id: 15002

If you performed a dihybrid cross and found that your results were significantly different from the 9:3:3:1 ratio, what would you suspect?

#Unit 8. Inheritance Biology
  1. You miscounted your results.
  2. You had too small a sample size and need to repeat the experiment.
  3. You picked two genes that are linked and thus do no assort independently
  4. You picked two genes that are linked and thus do not segregate during gamete formation.

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TLS Online TPP Program

#Question id: 2395

#Unit 2. Cellular Organization

Which structure is not part of the endomembrane system?
TLS Online TPP Program

#Question id: 34175

#Unit 3. Fundamental Processes

A. For processive DNA synthesis, proofreading occurs without releasing the DNA from the polymerase
B. When a mismatched base pair is present in the polymerase active site, the primer:template junction is destabilize
C. The DNA polymerase active site binds such a mismatched template poorly, but the exonuclease active site has a 10-fold higher affinity.
D. The incorrect nucleotide is removed by the 5’-3’-exonuclease nuclease activity

Choose true and false
TLS Online TPP Program

#Question id: 1159

#Unit 4. Cell Communication and Cell Signaling

Cholera toxin can make you sick through overactivation of a Gs pathway even if your body stops making the ligand associated with activation of the pathway. Knowing this, which of the following CANNOT be true about cholera toxin?
TLS Online TPP Program

#Question id: 5582

#Unit 5. Developmental Biology

Secretion of Müllerian-inhibiting substance by Sertoli cells:
TLS Online TPP Program

#Question id: 622

#Unit 1. Molecules and their Interaction Relevant to Biology

An enzyme-catalyzed reaction was carried out with the substrate concentration initially a thousand times greater than the Km for that substrate.  After 9 minutes, 1% of the substrate had been converted to product, and the amount of product formed in the reaction mixture was 12 micromol.  If, in a separate experiment, one-third as much enzyme and twice as much substrate had been combined, how long would it take for the same amount (12 micromol) of product to be formed?