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TLS Online TPP Program
#Question id: 4087
#Unit 3. Fundamental Processes
Polyadenylation can promote translation
a. of the fragile-X gene.
b. of stored oocyte mRNAs.
c. by allowing for greater interaction at the 5´ end.
d. by allowing for greater interaction with translation initiation factors.
TLS Online TPP Program
#Question id: 28215
#Unit 5. Developmental Biology
In the frog (Xenopus laevis) a gradient of the paracrine factor activin, which of the following observation is correct at the lower concentrations of activin ?
TLS Online TPP Program
#Question id: 31190
#Unit 4. Cell Communication and Cell Signaling
In the resting state, kinases CK1 and GSK3, sequentially phosphorylate β-catenin on:
TLS Online TPP Program
#Question id: 15360
#Unit 4. Cell Communication and Cell Signaling
The cytochrome P450 constitute a superfamily of heme-containing enzymes that occur in nearly all living organisms, from bacteria to mammals, These monooxygenases, which in animals are embedded in the endoplasmic reticulum membrane, catalyze reactions of the sort
RH + O2 + 2 H+ + 2e− → ROH + H2O
The electrons (e−) are supplied by NADPH, which passes them to cytochrome P450’s heme prosthetic group via the intermediacy of the enzyme NADPH P450 reductase. Here RH represents a wide variety of usually lipophilic compounds for which the different cytochromes P450 are specific. They include
a. polycyclic aromatic hydrocarbons
b. polycyclic biphenyls
c. frequently carcinogenic compounds that are present in tobacco smoke, broiled meats, and other pyrolysis products
d. which were widely used in electrical insulators and as plasticizers and are also carcinogenic.
TLS Online TPP Program
#Question id: 9253
#Unit 9. Diversity of Life Forms
A certain species of pine tree survives only in scattered locations at elevations above 2,800 meters in the western United States. To understand why
this tree grows only in these specific places, an ecologist should ________.