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TLS Online TPP Program
#Question id: 4914
#Unit 8. Inheritance Biology
German scientist Carl Correns found that the inheritance of variegated color on the leaves of certain plants was determined only by the maternal parent. What phenomenon explains this pattern of inheritance?
TLS Online TPP Program
#Question id: 10786
#Unit 6. System Physiology – Plant
Alkaloids are usually synthesized from one of a few common amino acids such as___
TLS Online TPP Program
#Question id: 19688
#Unit 13. Methods in Biology
Which kind of event is represented by the T wave on the ECG recording?
TLS Online TPP Program
#Question id: 14686
#Unit 4. Cell Communication and Cell Signaling
This member of the AKAP family, designated mAKAP, anchors both PDE and the regulatory subunit of PKA to the nuclear membrane, maintaining them in a negative feedback loop that provides close local control of the ATP level and PKA activity.
B- The basal level of PDE activity in the presence of hormone (resting state) keeps cAMP levels below those necessary for PKA activation.
C- Activation of β-adrenergic receptors causes an increase in cAMP to a level in excess of that which can be degraded by PDE.
D- The resulting binding of cAMP to the R subunits of PKA releases the active catalytic (C) subunits into the cytosol. Some C subunits enter the nucleus, where they phosphorylate and thus activate certain transcription factors . Other C subunits phosphorylate PDE, stimulating its catalytic activity.
E- Active PDE hydrolyzes cAMP, thereby driving cAMP levels back to basal levels and causing re-formation of the inactive PKA C-R complex. Subsequent de-phosphorylation of PDE returns the complex to the resting state.
TLS Online TPP Program
#Question id: 2018
#Unit 4. Cell Communication and Cell Signaling
What aspect of the immune response would a patient who has a parasitic worm infection and another patient responding to an allergen such as ragweed pollen have in common?