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TLS Online TPP Program

#Question id: 11203

Which of the following statements about action potentials is correct?

#Unit 7. System Physiology – Animal
  1. Action potentials for a given neuron vary in magnitude.
  2. Action potentials for a given neuron vary in duration.
  3. Action potentials are propagated down the length of the axon.
  4. Movement of ions during the action potential occurs mostly through the sodium pump.
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TLS Online TPP Program

#Question id: 5847

#Unit 8. Inheritance Biology

A Holliday structure is a(n)
TLS Online TPP Program

#Question id: 4384

#Unit 3. Fundamental Processes

Transcriptionally inactive genes
TLS Online TPP Program

#Question id: 12227

#Unit 10. Ecological Principles

During the course of the formation of a parasite/host relationship, a critical first step in this evolution would be
TLS Online TPP Program

#Question id: 5244

#Unit 8. Inheritance Biology

Transformation can used to map bacterial gene, which of the following statement is correct?
TLS Online TPP Program

#Question id: 1253

#Unit 4. Cell Communication and Cell Signaling

Following statements are regarding to the wnt signalling.

A. Wnt proteins interact with several cell-surface proteins and activate multiple downstream signal transduction pathways. The principal signaling receptor for Wnt proteins is Frizzled (Fz), which contains seven transmembrane α helices.

B. The palmitate attached to the Wnt protein binds to a specific site on the Fz intracellular domain and stabilizes the Wnt-Fz complex.

C. “canonical” Wnt signaling pathway uses a second transmembrane protein, LRP, that associates with Frizzled in a Wnt signal– dependent manner.

D. In the resting state, two kinases in the complex, casein kinase 1 (CK1) and GSK3, sequentially phosphorylate β-catenin on multiple tyrosine residues.

Which of the following statements are correct?