Practice Questions

TLS Online TPP Program

#Question id: 2456

If the activity of thymosin β4 was inhibited in fibroblasts, the overall effect would be:

#Unit 2. Cellular Organization

a decrease in cell locomotion because less actin would be recruited to the leading edge.
an increase in cell locomotion because there would be a higher concentration of actin available.
no change in cell locomotion because thymosin β4 doesn’t interact with Rho, Rac, or Cdc42.
decrease in cell locomotion because there would be a higher concentration of actin available.

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TLS Online TPP Program

#Question id: 11553

#Unit 7. System Physiology – Animal

Tadpoles must undergo a major metamorphosis to become frogs. This change includes reabsorption of the tail, growth of limbs, calcification of the skeleton, increase in rhodopsin in the eye, development of lungs, change in hemoglobin structure, and reformation of the gut from the long gut of an herbivore to the short gut of a carnivore. Amazingly, all of these changes are induced by thyroxine. What is the most likely explanation for such a wide array of effects of thyroxine?

TLS Online TPP Program

#Question id: 12371

#Unit 10. Ecological Principles

Succession results from disturbance by fire.

TLS Online TPP Program

#Question id: 958

#Unit 1. Molecules and their Interaction Relevant to Biology

Phenylketonuria (PKU) is a disease caused by a defect in ________ formation.

TLS Online TPP Program

#Question id: 18671

#Unit 13. Methods in Biology

larger fragments of DNA can be analysed by Agarose gel while shorter fragment 80 – 1000 nt can be analysed by using