Following statements regarding to the molecular processes of capacitation.

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

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

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 izumo, which is critical in sperm-egg fusion.

which one of the following combinations is correct?

TLS Online TPP Program

#Question id: 24574

#Unit 10. Ecological Principles

If number of birds in the population N0= 100 next year ecologists count 110 birds in the same population, consider a population of birds growing at a rate of 5% per year. After 5 years how many birds would there be?

TLS Online TPP Program

#Question id: 24573

#Unit 10. Ecological Principles

Calculate the finite rate of increase, if ecologists count the number of birds in the population, N0= 100, the next year ecologists count 110 birds in the same population, 

TLS Online TPP Program

#Question id: 24572

#Unit 10. Ecological Principles

Find out the characteristics of geometric growth?

a. It can grow for both periodic and continuous breeders

b. depends on the activity of net reproductive growth rate

c. unlimited Population Growth Leads to J-shaped

d. unlimited Population Growth Leads to S-shaped

e. resources are not limited

TLS Online TPP Program

#Question id: 24571

#Unit 10. Ecological Principles

In which case the population eventually decline to extinction?

TLS Online TPP Program

#Question id: 24570

#Unit 10. Ecological Principles

Geometric growth describes the population growth where is the N0= 100 is the number of females currently in the population,  what is the population size after the five generation if R0= 1.4 ?

TLS Online TPP Program

#Question id: 24569

#Unit 10. Ecological Principles

Geometric and the exponential growth both are describe by 

a. similar mathematical models

b. slightly different mathematical models

c. similar  J-shaped growth curve

d. similar S-shaped growth curve