KINESIOL 2Y03 Lecture Notes - Lecture 3: Zona Pellucida, Zp3, Pronucleus

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parveendhillon73

7 Nov 2022

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1st sperm binds to integrin 26ft on oocyte plasma membrane (cid:8869) causes depolarization - electrical change of oocyte plasma membrane. Shocks all other sperm (fast block to polyspermy ) slow block to poly spermy. Oocyte shrinks - zona pellucida denatures (cid:8869) causes space. Female nucleus undergoes 2nd meiotic division (cid:8869) ovum 1- 2nd polar body. Sperm head turns into the male pronucleus. Haploid pronucli fuse and form single nucleus (cid:8869) zygote (diploid. ) usually. ~ 6- 36hrs to occur iz or more. Morula breaks free from zona pellucida (hatching) (cid:8869) secretes fluid - pushes cells to side + creates cavity filled w/ fluid. Cells survive of cells cytosol nutrients + uterine milk (glycogen rich) { entered uterine cavity - will undergo implantation. Totipotent : can become any cell type in the body cells become pluripotent (cid:8869) started to differentiate (cid:8869) can"t form all types anymore detected in urine (pregnancy tests) release hormone : human chorionic.

Related Questions

Q1. Both neurons and epithelial cells can sometimes be joined to neighboring cells via gap junctions
a. TRUE
b. FALSE

Q2. Which of the following transport proteins is important for maintaining the electrical gradient across the plasma membrane of a neuron?
a. Facilitated transport proteins
b. Voltage-gated Na⁺ channel
c. Na⁺/K⁺ ATPase
d. Na⁺/glucose symporter SGLT1

Q3. During an action potential, Na⁺ influx______ the membrane potential, and K⁺ efflux subsequently ______ the membrane potential.
a. Depolarizes; repolarizes
b. Hyperpolarizes; depolarizes
c. Repolarizes; depolarizes
d. Polarizes; hyperpolarizes

Binding of an eosinophil to an antibody-coated parasitic worm involves binding of the antibody's stem region to a(n) ______.

a. antigen-binding site on the eosinophil plasma membrane

b. plasma membrane protein on the eosinophil's surface

c. plasma membrane protein on the worm's surface

d. antigen-binding site on a worm cell's plasma membrane

ivorysheep152

The rough ER is the site of synthesis of many different classes of membrane protein. Some of these proteins remain in the ER, whereas others are sorted to compartments such as the Golgi apparatus, lysosomes, and the plasma membrane. One measure of the difficulty of the sorting problem is the degree of âpurificationâ that must be achieved during transport from the ER. Are proteins bound for the plasma membrane common or rare among all ER membrane proteins? A few simple considerations allow one to answer this question. In a typical growing cell that is dividing once every 24 hours, the equivalent of one new plasma membrane must transit the ER every day. If the ER membrane is 20 times the area of a plasma membrane, what is the ratio of plasma membrane proteins to other membrane proteins in the ER? (Assume that all proteins on their way to the plasma membrane remain in the ER for 30 minutes on average before exiting, and that the ratio of proteins to lipids in the ER and plasma membranes is the same.) PLEASE DUMB THIS DOWN

KINESIOL 2Y03 Lecture Notes - Lecture 3: Zona Pellucida, Zp3, Pronucleus

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