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TLS Online TPP Program

#Question id: 12269

If a woman hears her baby cry, she may experience milk ejection from the nipples even before the baby is placed to the breast. What is the explanation for this?

#Unit 7. System Physiology – Animal
  1. The sound of the hungry baby’s cry elicits secretion of oxytocin from the posterior pituitary, which reaches the breast and causes contraction of the myoepithelial cells
  2. The sound of the hungry baby’s cry causes a reflex relaxation of the myoepithelial cells, allowing the milk to flow
  3. The sound of the hungry baby’s cry elicits a surge of prolactin from the anterior pituitary, which promptly stimulates milk production from the breast
  4. The sound of the hungry baby’s cry elicits sympathetic nervous system discharge that causes contraction of the myoepithelial cells
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TLS Online TPP Program

#Question id: 13161

#Unit 4. Cell Communication and Cell Signaling

Which of the following mechanism depends on the activation of heterotrimeric G proteins?
TLS Online TPP Program

#Question id: 13162

#Unit 4. Cell Communication and Cell Signaling

In the amoeba Dictyostelium discoideum, cAMP acts as an extracellular signalling molecule and binds to and signals via a G protein–coupled receptor; it is not a second messenger. Amoeba cells were transfected with genes encoding two fusion proteins: a Gα fused to cyan fluorescent protein (CFP), and a Gβ fused to yellow fluorescent protein (YFP). CFP normally fluoresces 490-nm light; YFP, 527-nm light. In which conditions fluorescence
energy transfer occur from CFP to YFP?
TLS Online TPP Program

#Question id: 13163

#Unit 4. Cell Communication and Cell Signaling

Following statements are regarding to the interaction between β2-adrenergic receptor and G- protein.
TLS Online TPP Program

#Question id: 13164

#Unit 4. Cell Communication and Cell Signaling

Match the following.

Column I

Column II

Column III

A. G Protein–Coupled Receptors That

Activate PDE

i. cAMP

a. Increase in conversion of glycogen to glucose

B. G Protein–Coupled Receptors That

Activate Adenylyl Cyclase

ii. cGMP

b. Hyperpolarization or depolarization of photoreceptor membrane

C. G Protein–Coupled Receptors That

inhibit Adenylyl Cyclase

iii. DAG

c. activates genes necessary for cell division

D. G Protein–Coupled Receptors

That Trigger Elevations in Cytosolic and

Mitochondrial Calcium

 

d. increase in K+ permeability hyperpolarizes the

membrane

Which one of the following is correct?
TLS Online TPP Program

#Question id: 13165

#Unit 5. Developmental Biology

One of the main ways by which the insulin signaling pathway might function to lower longevity is to activate mTORC1, a protein kinase complex that promotes the translation of mRNA into proteins in response to nutrients and hormones, select incorrect statement;
TLS Online TPP Program

#Question id: 13168

#Unit 10. Ecological Principles

Use the following diagram from the text showing the spread of the cattle egret, Bulbulcus ibis, since its arrival in the New World, to answer the following question.


How would an ecologist likely explain the expansion of the cattle egret?