TLS Online TPP Program

#Question id: 12151


The basic model of metapopulation dynamics predicts a shifting mosaic of occupied and unoccupied sites under which of the following combinations of extinction (E) and colonization (C) rates? 

#Unit 10. Ecological Principles
  1. E = 0
  2. C = 0
  3. E = C
  4. 0 <E <C
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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: 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: 28248

#Unit 5. Developmental Biology

The interaction of sperm and egg generally proceeds in a particular sequence manner, select the correct sequence; 

TLS Online TPP Program

#Question id: 28249

#Unit 5. Developmental Biology

Acrosome is derived at the time of maturation from which organelles?

TLS Online TPP Program

#Question id: 28250

#Unit 5. Developmental Biology

The major motor protein of the flagellum of sperm is

TLS Online TPP Program

#Question id: 28251

#Unit 5. Developmental Biology

the arrangement of axoneme in sperm propulsion system consist of___