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?

#Question id: 5424

#Unit 8. Inheritance Biology

Imagine that height in corn plants is determined by three loci. The baseline height is 100 cm. Every + allele adds 10cm to the plant’s potential height, every – allele subtracts 10 cm from the plant’s potential height. The shortest possible plant and the tallest possible plant are mated to form an F1, what is the height of the F1?

#Question id: 5605

#Unit 5. Developmental Biology

Double fertilization is a unique feature of flowering plants. In this process, one sperm unites with the egg to yield a zygote. The second sperm unites with the polar nuclei to initiate the formation of the

#Question id: 11044

#Unit 7. System Physiology – Animal

Using the following data, calculate the filtration coefficient for the capillary bed:

Plasma colloid osmotic pressure = 30 mm Hg

Capillary hydrostatic pressure = 40 mm Hg

Interstitial hydrostatic pressure = 5 mm Hg

Interstitial colloid osmotic pressure = 5 mm Hg

Filtration rate = 150 ml/min

Venous hydrostatic pressure = 10 mm Hg

#Question id: 14756

#Unit 5. Developmental Biology

#Question id: 18782

#Unit 13. Methods in Biology