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TLS Online TPP Program

#Question id: 5657

Following statements regarding to the molecular processes of capacitation.

A. The sperm cell membrane is altered by the removal of cholesterol by albumin proteins in the female reproductive tract.

B. Particular proteins or carbohydrates on the sperm surface are lost during capacitation.

C. The membrane potential of the sperm cell becomes more positive as potassium ions leave the sperm. This change in membrane potential may allow calcium channels to be opened and permit calcium to enter the sperm.

D. Calcium and bicarbonate ions are critical in activating cAMP production and in facilitating the membrane fusion events of the acrosome reaction.

E. As a result of cAMP formation, protein phosphorylation occurs. Once they are phosphorylated, some proteins migrate to the surface of the sperm head. One of these proteins is juno, which is critical in sperm-egg fusion.

which one of the following combinations is correct?

#Unit 5. Developmental Biology

  1. A, B and C

  2. B, C and E

  3. C, D and E

  4. A, B and D

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TLS Online TPP Program

#Question id: 8923

#Unit 9. Diversity of Life Forms

Which of these genetic processes may be most helpful in accounting for the Cambrian explosion?
TLS Online TPP Program

#Question id: 11196

#Unit 7. System Physiology – Animal

Pyrethroid insecticides prevent the voltage-gated sodium channels of insects from inactivating. Neurons that were exposed to pyrethroids would ________.
TLS Online TPP Program

#Question id: 21139

#Unit 12. Applied Biology

Strain improvement for the large scale antibiotics production by using methods__
I) Gene transformation
II) Mutation and selection
III) Auxotophs mutants
TLS Online TPP Program

#Question id: 23499

#General Aptitude

Which part of the Central Processing Unit (CPU) performs calculation and makes decision
TLS Online TPP Program

#Question id: 13014

#Unit 10. Ecological Principles

A population is correctly defined as having which of the following characteristics?
I. Inhabiting the same general area
II.    Individuals belonging to the same species
III.  Possessing a constant and uniform density and dispersion