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TLS Online TPP Program

#Question id: 223

Which coenzyme links to a lysine residue in a proteinʹs active site?
A) biotin
B) lipoic acid (lipoamide)
C) pyridoxal phosphate
D) biotin and pyridoxal phosphate only

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. A & B    

  2. A & C 

  3. B, C & D

  4. B & C

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TLS Online TPP Program

#Question id: 15834

#Unit 8. Inheritance Biology

You are interested in a new type of autosomal dominant mutation that gives purple eyes in Drosophila. You have a true-breeding purple-eyed line carrying a mutation that you call pr-1. You have isolated a second purple-eyed mutation that you call pr-2, which you have established in a true-breeding line that also carries a recessive marker st, which gives stubby legs. You cross a fly from the pr-1 line to a fly from the st, pr-2 line producing F1 females which you then cross to males from a true breeding st line (normal eyes). From this cross, 1000 progeny flies can be categorized into four different phenotypic classes:
                             
Normally, 3-factor crosses give eight different phenotypic classes, why does this particular cross give only four?
TLS Online TPP Program

#Question id: 7199

#Unit 5. Developmental Biology

Following statements are regarding to the establishment of ventral axis in Drosophila.

A. Ventral follicle cells synthesize Pipe. Pipe signal sulfates ventral vitelline proteins.

B. GD cleaves Snake to its active form and forms a complex with Snake and uncleaved Easter proteins.

C. Sulfated vitelline membrane proteins bind Gastrulation-defective (GD).

D. Easter protein is cleaved into its active form. Cleaved Easter binds to and cleaves Spätzle; activated Spätzle binds to Toll receptor protein.

E. Dorsal protein enters the nucleus and ventralizes the cell.

F. Toll activation activates Tube and Pelle, which phosphorylate the Cactus protein. Cactus is degraded, releasing it from Dorsal.

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

#Question id: 18611

#Unit 13. Methods in Biology

The long product of PCR is generated in
TLS Online TPP Program

#Question id: 1153

#Unit 4. Cell Communication and Cell Signaling

Which of the following statements about adenylyl cyclase stimulation/inhibition in adipose cells is TRUE?
TLS Online TPP Program

#Question id: 748

#Unit 1. Molecules and their Interaction Relevant to Biology

The bond between the bases and the sugars in DNA referred as: