TLS Online TPP Program

#Question id: 2520


During the course of a muscle twitch (a contraction due to a single action potential), when is the free calcium concentration of the muscle cytoplasm highest?

#Unit 2. Cellular Organization
  1. milliseconds before the T tubule undergoes an action potential

  2. after the T tubule undergoes an action potential but before the muscle generates tension

  3. at the height of the tension generated by the muscle

  4. at the end of the twitch, after the muscle has relaxed

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TLS Online TPP Program

#Question id: 7194

#Unit 5. Developmental Biology

Formation of digits and sculpting the tetrapod limb requires death of specific cells in the limb in a programmed manner. Which one of the following interactions could explain proper limb formation?

TLS Online TPP Program

#Question id: 24634

#Unit 2. Cellular Organization

Chromosomal packaging in bacteria maintained by

TLS Online TPP Program

#Question id: 26857

#Unit 10. Ecological Principles

Calculate the efficiency of GPP, if the energy of incident light is 1000 J but Energy fixed by GPP is 100 J ?

TLS Online TPP Program

#Question id: 31107

#Unit 2. Cellular Organization

Which of the following small protein involved in actin treadmilling, but it binds specifically to F-actin in which the subunits contain ADP?

TLS Online TPP Program

#Question id: 11828

#Unit 6. System Physiology – Plant

Given some enzymes of ethylene biosynthetic pathway and its character;

A) ACC synthase                                                               i) It is an unstable, cytosolic enzyme. Its level is regulated by environmental and internal factors, such as wounding, drought stress, flooding, and auxin

B) ACC oxidase                                                                  ii) It catalyzes the last step in ethylene biosynthesis, the conversion of ACC to ethylene

                                                                                                iii) Its activity can be the rate-limiting step in ethylene biosynthesis

                                                                                                iv) That is encoded by a multigene family that is differentially regulated

                                                                                                v) It is present in such low amounts in plant tissues and is very unstable and also difficult to purify the enzyme  for biochemical analysis

                                                                                                vi) These enzymes belong to the Fe2+/ascorbate oxidase superfamily

Find out the correct combination from the given enzymes and its character?