Calculate the percentage of histidine that has its imidazole side chain protonated at pH 7.3. The pKa values for histidine are pK1 = 1.8, pK2 (imidazole) = 6.0, and pK3 = 9.2.

TLS Online TPP Program

#Question id: 943

#XL - Q Biochemistry

An amino acid formed by transamination of a citric acid cycle intermediate is ________.

TLS Online TPP Program

#Question id: 2364

#XL - Q Biochemistry

An enzyme's specificity is caused by the ______ of the active site.

TLS Online TPP Program

#Question id: 4765

#XL - R Botany

The recessive mutant allele that causes cystic fibrosis is much more frequent in Caucasians population than in other world populations. Some scientists believe heterozygotes must have had a survival advantage during plagues such as cholera that occasionally swept through this population. What concept does this illustrate?

TLS Online TPP Program

#Question id: 1554

#XL - S Microbiology

Which domain of MHC-1 is interact with CD8 cell surface molecule found on TC cells.

TLS Online TPP Program

#Question id: 8901

#XL - T Zoology

The origin of the craniates occurred at roughly the same time as the