Five types of constraints affect the stability of an  helix: 

(1) the intrinsic propensity of an amino acid residue to form an  helix; 

(2) the interactions between R groups, particularly those spaced three (or four) residues apart; 

(3) the bulkiness of adjacent R groups; 

(4) the occurrence of Pro and Gly residues; and 

(5) interactions between amino acid residues at the ends of the helical segment and the electric dipole inherent to the  helix.

TLS Online TPP Program

#Id: 4806

#Unit 13. Methods in Biology

Probability distribution yields the possible outcomes for any random event. It is also defined based on the underlying sample space as a set of possible outcomes of any random experiment.

TLS Online TPP Program

#Id: 6021

#Unit 3. Fundamental Processes

Cdc45 and GINS form a stable complex with the Mcm2-7 helicase (called the Cdc45/ Mcm2-7/GINS, or CMG, complex) and dramatically activate Mcm2-7 helicase activity.

TLS Online TPP Program

#Id: 2011

#Unit 8. Inheritance Biology

Testcross Cross between an individual with an unknown genotype and an individual with the homozygous recessive genotype.

TLS Online TPP Program

#Id: 3145

#Unit 7. System Physiology – Animal

Residual volume the volume of air remaining in the lungs after the most forceful expiration

TLS Online TPP Program

#Id: 7017

#Unit 5. Developmental Biology

Chemical regulation of stem cells takes the form of secreted proteins from surrounding cells that influence stem cell states and progenitor differentiation through endocrine, paracrine, or juxtacrine mechanisms.