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TLS Online TPP Program

#Question id: 3782

In his work with pneumonia-causing bacteria and mice, Griffith found that

#Unit 3. Fundamental Processes

  1. the protein coat from pathogenic cells was able to transform nonpathogenic cells.

  2. heat-killed pathogenic cells caused pneumonia.

  3. some substance from pathogenic cells was transferred to nonpathogenic cells, making them pathogenic.

  4. the polysaccharide coat of bacteria caused pneumonia.

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TLS Online TPP Program

#Question id: 2578

#Unit 2. Cellular Organization

Following statements are regarding to proteins which involve actin filament assembly.

A. To nucleate the assembly of branched actin, Arp2/3 needs to be activated by interacting with a nucleation promoting factor (NPF), in addition to associating with the side of a pre-existing actin filament.

B. The NPF WASp is inactive due to an intramolecular interaction that masks the WCA domain.

C. Two NPFs each bind an actin subunit at their WH2 domains, and together, they activate the Arp2/3 complex through its interaction with their connector and acidic domains.

D. The NPF WASp is activated by a coincidence detection mechanism by which intramolecular interaction in WASp is relieved, allowing the W domain to bind actin and the acidic A domain to activate the Arp2/3 complex.

Which of the following statements represents regulation of the Arp2/3 complex by NPF?
TLS Online TPP Program

#Question id: 28590

#Unit 2. Cellular Organization

G1/S phase and S phase CDK are
TLS Online TPP Program

#Question id: 2433

#Unit 2. Cellular Organization

All types of myosins

a. bind and hydrolyze ATP.               

b. bind actin filaments.

c. form dimers.                       

d. contain an associated myosin light chain.

e. move toward the (+) end of an actin filament.
TLS Online TPP Program

#Question id: 12990

#Unit 1. Molecules and their Interaction Relevant to Biology

Choose the incorrect statement related to ionic interactions
a. Ionic interactions takes place between positively and negatively charged amino acids side chain.
b. Ionic interactions takes place between positively and positively charged amino acids side chain.
c. ionic interaction has almost 20 kj/mol of bond energy.
d. ionic interaction is weak interaction that have lowest 20kj/mol of bond energy.
e. strength of ionic bond within protein chain calculated by
 
TLS Online TPP Program

#Question id: 331

#Unit 1. Molecules and their Interaction Relevant to Biology

A positive and a negative charge are initially 4 cm apart. When they are moved closer together so that they are now only 1 cm apart, the force between them will be