#Question id: 11205
#Unit 7. System Physiology – Animal
What would probably happen if a long neuron had one continuous myelin sheath down the length of the axon with no nodes of Ranvier?
#Question id: 722
#Unit 1. Molecules and their Interaction Relevant to Biology
The structure of alpha helix is stabilized by hydrogen bonds between the hydrogen atom attached to the electronegative nitrogen atom of a peptide linkage and the electronegative carbonyl oxygen atom of the fourth amino acid on the amino-terminal side of that peptide bonds. Within the helix, every peptide bond (except those close to each end of the helix) participates in such hydrogen bonding. Each successive turn of the helix is held to adjacent turns by three to four hydrogen bonds, conferring significant stability on the overall structure. Which of the following are correct statements regarding these findings?
A. At the ends of a helical segment, there are always three or four amide carbonyl or amino groups that participate in this stabilised helical pattern of hydrogen bonding.
B. Helix ends are exposed to the surrounding solvent, where they hydrogen-bond with water, or other parts of the protein may cap the helix to provide the needed hydrogen-bonding partners.
C. Helix can form in polypeptides consisting of either L- or D-amino acids but a D-amino acid will disrupt a regular structure consisting of L-amino acids, and vice versa.
D. The most stable form of a helix consisting of L-amino acids is left-handed.
E. 310 helix occupies similar place as turns in Ramachandran plot due to its confirmation
#Question id: 5667
#Unit 5. Developmental Biology
There may be an important connection between sperm translocation and capacitation. Which of the following option is correct explanation of above statement?
#Question id: 648
#Unit 1. Molecules and their Interaction Relevant to Biology
Enzyme catalysis is regulated by a number of mechanisms. Also, the flux through metabolic pathways must be regulated. Given the metabolic pathway below, which choice accurately describes the regulation of compound G levels?
#Question id: 21274
#Unit 12. Applied Biology