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TLS Online TPP Program

#Question id: 34143

Which of the following best explains how normal plasma oxytocin levels at the onset of labor can still result in powerful uterine contractions?

#Unit 7. System Physiology – Animal
  1. The uterus begins secreting its own oxytocin, which inhibits progesterone and directly stimulates the fetal adrenal cortex.
  2. The descent of the fetus stimulates a hypothalamic feedback loop that rapidly increases systemic oxytocin to supraphysiologic levels.
  3. There is a marked upregulation of uterine oxytocin receptors at term, making the myometrium hypersensitive even to baseline oxytocin levels, initiating a positive feedback loop.
  4. Oxytocin receptors on the cervix and vagina directly stimulate the anterior pituitary to secrete oxytocin during early labor.
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TLS Online TPP Program

#Question id: 16136

#Unit 13. Methods in Biology

You obtain 6 BACs (of known order, as shown below) and 7 STSs (of unknown order) that derive from a region of mouse chromosome 16 whose genomic sequence has not yet been finished.   
 
By PCR (using 20-bp primers at either end of each STS), you test each of the 6 BACs for the presence (+) or absence (-) of each of the 7 STSs. You obtain the following results:
 
Is there a second STS at which you would like to sequence PCR products obtained using BACs as templates? If so, which BACs would you test in this way, and what sequencing results might you predict for each of the BACs tested?
TLS Online TPP Program

#Question id: 34116

#Unit 2. Cellular Organization

A. The positive charge on lysine is neutralized upon acetylation
B. Methylated lysine and arginine are neutral.
C. Lysine can be mono-, di-, or triacetylated
D. Arginine can be mono or diacetylated. 
E. Both Lysine and Arg can be acetylated

Choose true and false
TLS Online TPP Program

#Question id: 4001

#Unit 1. Molecules and their Interaction Relevant to Biology

Which is not true about the lac repressor?
TLS Online TPP Program

#Question id: 23047

#Unit 12. Applied Biology

Which of the following process involves super aeration of groundwater?
TLS Online TPP Program

#Question id: 28840

#Unit 2. Cellular Organization

Which of the following 8-subunit protein complex that binds to sites along the microtubule and recruits γ-TuRC, which nucleates a new microtubule to form a microtubule branch?