Practice Questions

TLS Online TPP Program

#Question id: 15780

In drosophila, the somatic cells of the hub are able to regulate stem cell proliferation by secreting the paracrine factor Unpaired onto the cells attached to them. Unpaired activates the JAK-STAT pathway in the adjacent germ stem cells to specify their self-renewal. Those cells that are distant from the paracrine factor cannot receive this signal, they begin their differentiation into the sperm cell lineage. This means hub cells act as

#Unit 5. Developmental Biology

Stem cell niches allow controlled self-renewal and also survival of the cells that leave the niche.
Stem cell niches not allow controlled self-renewal but allow survival of the cells that leave the niche.
Stem cell niches allow uncontrolled self-renewal and also division of the cells that leave the niche.
Stem cell niches allow controlled self-renewal and regulate the ratio of cell division to differentiation.

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TLS Online TPP Program

#Question id: 11086

#Unit 7. System Physiology – Animal

A 17-year-old female was bicycling without a helmet when she fell and hit her head. In the emergency room, she was not conscious and was receiving ventilator assistance. Her blood gases follow:

PaO2 = 52 mm Hg,

PaCO2 = 75 mm Hg, pH = 7.15, and

HCO3− = 31 mM

The majority of the CO2 was being transported as

TLS Online TPP Program

#Question id: 17657

#Unit 7. System Physiology – Animal

A recent national survey revealed that college students find _____ to be the biggest impediment to their academic success.

TLS Online TPP Program

#Question id: 27550

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following is correct ionization series for His