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TLS Online TPP Program

#Question id: 4764

Which of the following is the best example of overdominance?

#SCPH12 I Genetics

  1. Two lines of true breeding white parents produce purple flowered offspring.

  2. Two lines of true breeding tomatoes that are susceptible to verticillium wilt (a fungal infection) produce offspring thatare resistant to verticillium wilt.

  3. Two true breeding lines, one tall and one short, produce offspring of medium height.

  4. Two true breeding lines, one tall and one short, produce all tall offspring.

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TLS Online TPP Program

#Question id: 609

#SCPH05 I Biotechnology

The ________ theory explains cooperative binding by suggesting all subunits of a given protein have the same conformation, either all R or all T.
TLS Online TPP Program

#Question id: 22949

#I Life Science/ Life Sciences Group – I-V

How CONSTANS gene and its encoded protein involved in translating day length into a signal that converts a vegetative shoot meristem into a floral meristem?
TLS Online TPP Program

#Question id: 8294

#I Life Science/ Life Sciences Group – I-V

The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed three-chambered hearts (two atria, one ventricle). Birds and mammals, however, are alike in having four-chambered hearts (two atria, two ventricles). The fourchambered hearts of birds and mammals are best described as ________.
TLS Online TPP Program

#Question id: 15470

#SCPH05 I Biotechnology

In the stoichiometric equation given below identify which one of the following corresponds to oxygen balance:
CwHxOyNz + aO2 + bHgOhNi cCHαOβNδ + dCO2 + eH2O
TLS Online TPP Program

#Question id: 2975

#I Life Science/ Life Sciences Group – I-V

Following statements are regarding to the Surveillance mechanisms in cell cycle regulation.

A. Surveillance mechanisms known as checkpoint pathways establish dependencies among cell cycle events and ensure that the next cell cycle event does not occur prior to the completion of a preceding event.

B. In response to DNA damage, two related protein kinases, ATM and ATR, are recruited to the site of the damage, where they activate signaling pathways that lead to cell cycle arrest, repair, and under some circumstances, apoptosis.

C. The spindle assembly checkpoint pathway, which causes initiation of anaphase, utilizes Mad2 and other proteins to regulate APC/CCdc20, which targets securing and mitotic cyclins for ubiquitinylation.

D. The spindle position checkpoint pathway prevents mitotic CDK inactivation when the spindle is mispositioned. In this pathway, localized activators and inhibitors and a sensor that shuttles between them allow cells to sense spindle position.

Which of the following statement is incorrect?