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TLS Online TPP Program

#Question id: 10128

PSII also involve in oxidation of water molecules, water is a very stable molecule that’s why  Oxidation of water to form molecular oxygen is very difficult, Many studies have provided a substantial amount of information about the process known;

which of the following are false ?

#Unit 6. System Physiology – Plant
  1. The photosynthetic oxygen-evolving complex is the only known biochemical system that carries out water oxidation process
  2. The protons produced by water oxidation are released into the lumen of the thylakoid, not directly into the stromal compartment because of the vectorial nature of the membrane
  3. The fact that the oxygen-evolving complex is localized near the exterior surface of the thylakoid membrane
  4. The protons produced by water oxidation are eventually transferred from the lumen to the stroma by translocation through the ATP synthase, In this way, the protons released during water oxidation contribute to the electrochemical potential driving ATP formation.
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TLS Online TPP Program

#Question id: 5564

#Unit 5. Developmental Biology

At the moment of sperm penetration, human eggs ________.
TLS Online TPP Program

#Question id: 5568

#Unit 5. Developmental Biology

Asexual reproduction results in offspring that are genetically identical to their parent. What type of cell process occurs to generate this type of offspring?
TLS Online TPP Program

#Question id: 5686

#Unit 5. Developmental Biology

Following statements are regarding to double fertilization in angiosperms.

A. One sperm cell fuses with the egg cell to produce the zygote that will develop into the new embryonic plant.

B. The second sperm cell fuses with the usually binucleate central cell, giving rise to the

endosperm, the tissue that nourishes the developing embryo. This second event is not “true” fertilization in the sense of male and female gametes undergoing fusion.

C. The second sperm cell fuses with the usually binucleate central cell, giving rise to the

endosperm, the tissue that nourishes the developing embryo. This second event is “true” fertilization in the sense of male and female gametes undergoing fusion.

D. During fertilization in angiosperm, when the sperm cells are released, the egg undergoes a flux of Ca2+. Then, chemicals released from the egg appear to make the sperm competent for cell fusion.

Which of the following statements are true?
TLS Online TPP Program

#Question id: 5685

#Unit 5. Developmental Biology

Human sperm are allowed to fertilize ova having non- functional ovastacin. The following possibilities may be of significance in the fusion of these gametes:

A.        The sperms will not fertilize ova.

B.        The sperms will bind and penetrate the zona pellucida but will not be able to fuse with ovum membrane.

C.        ZP2 will not be clipped by cortical granule protease.

D.        CD9 protein of egg membrane microvilli will not be able to interact sperm membrane proteins in the absence of ovastacin.

E.         Polyspermy may occur frequently.

Which combination of statements represent the outcome of the above event?
TLS Online TPP Program

#Question id: 5684

#Unit 5. Developmental Biology

Capacitated mammalian sperm can sense thermal differences as small as 0.014ºC over a millimeter and tend to migrate toward the higher temperature. This ability to sense temperature difference and preferentially swim from cooler to warmer sites is called as _____1___ found only in ______2____ sperm.
TLS Online TPP Program

#Question id: 5683

#Unit 5. Developmental Biology

There may be an important connection between sperm translocation and capacitation. Which of the following option is correct explanation of above statement?