TLS Online TPP Program

#Question id: 678


Which is not true about β-sheets?

#Unit 1. Molecules and their Interaction Relevant to Biology
  1. The side-chains of all amino acids point to the same side of the sheet.

  2. The polypeptide chains in the sheet are nearly fully extended.

  3. The range of allowed phi and psi angles is broader than for those in the α-helix.

  4. In antiparallel sheets the hydrogen bonds between adjacent strands are nearly perpendicular to the backbones of the strands.

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TLS Online TPP Program

#Question id: 32328

#Unit 1. Molecules and their Interaction Relevant to Biology

G-1-phosphate is converted into fructose 6-phosphate in two successive reactions. The Keq for this coupled reaction will be

TLS Online TPP Program

#Question id: 24667

#Unit 2. Cellular Organization

 The transfer of a lipid molecule across a bilayer, a process termed:

TLS Online TPP Program

#Question id: 15149

#Unit 8. Inheritance Biology

In this problem we will explore some of the many ways that mutations in two different genes can interact to produce different Mendelian ratios. Consider a hypothetical insect species that has red eyes. Imagine mutations in two different unlinked genes that can, in certain combinations, block the formation of red eye pigment yielding mutants with white eyes. In principle, there are two different possible arrangements for two biochemical steps responsible for the formation of red eye pigment. The two genes might act in series such that a mutation in either gene would block the formation of red pigment. Alternatively, the two genes could act in parallel such that mutations in both genes would be required to block the formation of red pigment.
Further complexity arises from the possibility that mutations in either gene that lead to a block in enzymatic activity could be either dominant or recessive. If the crosses is made between a wild type insect with red eyes and a true breeding white eyed strain with mutations in both genes. Such considerations yield the Pathways in series with recessive mutations in both genes, what will be the phenotype in F1 progeny?

TLS Online TPP Program

#Question id: 20284

#Unit 7. System Physiology – Animal

What is the importance of C-peptide in proinsulin?

TLS Online TPP Program

#Question id: 11092

#Unit 7. System Physiology – Animal

Which statement is the most accurate definition of external respiration?