#Question id: 2188
#Unit 2. Cellular Organization
The relative proportion (by weight) of lipid and protein in a membrane:
#Question id: 28166
#Unit 13. Methods in Biology
The stability of YAC clones increases with the length of the cloned DNA segment, what is the minimum length require for stability as normal cellular chromosomes
#Question id: 2589
#Unit 2. Cellular Organization
Following statements are regarding to the mechanism of thick filament regulation.
A. In vertebrate smooth muscle, phosphorylation of the myosin regulatory light chain (LC) activates contraction.
B. At Ca2+ concentrations of more than 10−6 M, the regulatory light chain is not phosphorylated, and the myosin adopts a folded conformation.
C. When the Ca2+ level rises, Ca2+ binds calmodulin (CaM), which undergoes a conformational change (CaM*). The CaM*-Ca2+ complex binds and activates myosin light chain kinase (MLC kinase), which then phosphorylates the myosin LC. This phosphorylation event unfolds the myosin II, which is now active and can assemble into bipolar filaments to participate in contraction.
D. When the Ca2+ levels drop, the myosin LC is dephosphorylated by myosin light-chain (MLC) phosphatase, which is dependent on Ca2+ for activity, causing muscle relaxation.
Which of the following combination is correct?
#Question id: 29085
#Unit 10. Ecological Principles
While studying the diversity of 4 communities, 5 species and 50 individuals were recorded from each community. The number of individuals under each species was listed as mentioned in the following table;
Which of the following is decreasing order of evenness of community?
#Question id: 4675
#Unit 3. Fundamental Processes
Which of the following repressor work as both activate as well as repress transcription ?