The conformation of the backbone of a polypeptide is described completely by the angle(s) of rotation about which bond(s)?

TLS Online TPP Program

#Question id: 31413

#Unit 2. Cellular Organization

Which one of the following options represents the correct match between the major accessory proteins (Column X) and their function(Column Y)?

Column X	Column Y
a. Katanin	i. Catastrophe factors
b. Kinesin-13	ii. Largest molecular motors
c. +Tips	iii. Extracting tubulin subunits from the wall of the microtubule
d. Dynein	iv. Plus-end tracking proteins

TLS Online TPP Program

#Question id: 31414

#Unit 4. Cell Communication and Cell Signaling

Which one of the following options represents the correct match between the proteins (Column X) and related processes(Column Y)?

Column X	Column Y
a. Cadherin	i. Adaptor
b. Catenin	ii. Transient cell–cell adhesion interactions in the bloodstream
c. Selectins	iii. Heterophilic binding to integrins
d. Intercellular cell adhesion molecules	iv. Cell-sorting

TLS Online TPP Program

#Question id: 31415

#Unit 7. System Physiology – Animal

A woman taking atropine for a gastrointestinal disorder notices that her pupils are dilated. This occurs because atropine blocks __________ receptors on the __________ muscle of the iris.

TLS Online TPP Program

#Question id: 31416

#Unit 4. Cell Communication and Cell Signaling

The abnormal activation of the PI 3-kinase/Akt/mTOR pathway, which normally occurs early in the process of tumor progression, helps to explain the excessive rate of glycolysis that is observed in tumor cells, known as: 

TLS Online TPP Program

#Question id: 31417

#Unit 2. Cellular Organization

Put these events in the correct temporal order: 

a. End plate potential (EPP)

b. Action potential in muscle fiber

c. ACh release from presynaptic terminal

d. MEPP

e. Opening ligand-gated ion channels

f. Opening Ca²⁺ channels in presynaptic terminal

g. Binding of ACh to nicotinic receptors,

h. Action potential in nerve fiber

TLS Online TPP Program

#Question id: 32132

#Unit 1. Molecules and their Interaction Relevant to Biology

For guanine, the pKa value is