#Question id: 12140
#Unit 10. Ecological Principles
#Question id: 11096
#Unit 7. System Physiology – Animal
In which structure does diffusion of oxygen to capillaries not play a major role?
#Question id: 10280
#Unit 6. System Physiology – Plant
The enzyme of glycolytic pathway that forms fructose 1,6-bisphosphate is called phosphofructokinase-1 (PFK-1), which statements can’t distinguish it from a second enzyme (PFK-2) Phosphofructokinase-2.
#Question id: 1374
#Unit 4. Cell Communication and Cell Signaling
Following statements are regarding to gap junctions.
i. Vertebrate gap junctions are composed of connexins, a family of structurally related transmembrane proteins with molecular weights between 26,000 and 60,000.
ii. Each vertebrate hexagonal particle consists of six noncovalently associated connexin molecules. Each individual connexin molecule has two membrane-spanning α helices with a topology similar to that of claudin.
iii. The permeability of gap junctions is regulated by posttranslational modification of connexins (e.g., phosphorylation) and is sensitive to changes in environmental conditions
such as intracellular pH and Ca2+ concentration, membrane potential, and the intercellular potential between adjacent interconnected cells (“voltage gating”).
iv. The assembly of connexins, their trafficking within cells, and the formation of functional gap junctions apparently depend on N-cadherin and its associated adapter proteins as well as desmosomal proteins.
Which of the following statements are correct?
#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?