Explanation:
In biochemistry, two biopolymers are antiparallel if they run parallel to each other but with opposite directionality (alignments). An example is the two complementary strands of a DNA double helix, which run in opposite directions alongside each other.
Answer:
The correct answer is option B. The tertiary structure of the beta subunit changes, exposing a hydrophobic cleft which allows hemoglobin to form long chains in RBC.
Explanation:
As it is clearly mention as there is point mutation that leads to single nucleotide change which results in to valine instead of glutamate. Valine is hydrophobic in nature not like glutamate. Valine aggregate and makes a rigid structure of molecules.
Due to this rigid molecule of valine aggregates, RBCs form a crescent or sickle like shape due to the higher viscosity and low solubility of Mutated hemoglobin in deoxy condition. It leads to formation of polymer that blocks the vessels.
Thus, the correct answer is option B.
Marine iguanas experience biggest problem as far as their diet is concerned. this is because 'they feed on sea plant that have high concentration of salts since plants living in this region are poor osmoregulators. in addition, when they are feeding, they may take in water which usually has high salt concentrations. to survive these harsh condition, marine iguana has salt gland located in the nostrils. these glands have several secretory tubules and each of the tubules has an epithelial lining with specialized cells that have the ability to transport salt from the body outside. to perform this function effectively, large amount of energy is required and as a result these cells have high numbers of mitochondria.
I’ve gone through this before and it only lasted about 1-3 days