This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: What activity during oocyte activation prevents penetration by additional ... (Read 52 times)

gonzo233

  • Hero Member
  • *****
  • Posts: 557
on: Feb 27, 2019
What activity during oocyte activation prevents penetration by additional sperm?

Question 2

A gene's position on a chromosome is called a
 A) karyotype.
  B) map.
  C) recombinant.
  D) genome.
  E) locus.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Yixagurpuldink

  • Sr. Member
  • ****
  • Posts: 341
Reply #1 on: Feb 27, 2019
Answer to Question 1

The first sperm to penetrate the oocyte triggers a sequence of changes that block entry by other sperm, or polyspermia. Polyspermy is prevented by depolarization of the egg membrane by opening of sodium channels and by the cortical reaction triggered by the release of calcium ion from smooth ER within the oocyte. The calcium ion stimulates the vesicles to undergo exocytosis. Their contents cause the zona pellucida to harden, creating a barrier against further sperm penetration.

Answer to Question 2

E


gonzo233

  • Member
  • Posts: 557
Reply 2 on: Feb 27, 2019
Gracias!

6ana001

  • Member
  • Posts: 311
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.

Did you know?

Chronic necrotizing aspergillosis has a slowly progressive process that, unlike invasive aspergillosis, does not spread to other organ systems or the blood vessels. It most often affects middle-aged and elderly individuals, spreading to surrounding tissue in the lungs. The disease often does not respond to conventionally successful treatments, and requires individualized therapies in order to keep it from becoming life-threatening.

Did you know?

The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.

Did you know?

Drug abusers experience the following scenario: The pleasure given by their drug (or drugs) of choice is so strong that it is difficult to eradicate even after years of staying away from the substances involved. Certain triggers may cause a drug abuser to relapse. Research shows that long-term drug abuse results in significant changes in brain function that persist long after an individual stops using drugs. It is most important to realize that the same is true of not just illegal substances but alcohol and tobacco as well.

Did you know?

Nearly all drugs pass into human breast milk. How often a drug is taken influences the amount of drug that will pass into the milk. Medications taken 30 to 60 minutes before breastfeeding are likely to be at peak blood levels when the baby is nursing.

Receptor activation Receptor activation
Many Americans perceive bullfighting as a cruel activity that should be illegal everywhere. To most ... Many Americans perceive bullfighting as a cruel activity that should be illegal everywhere. To most ...
The areas in which reading-associated increases in activity were observed in the fMRI study of ... The areas in which reading-associated increases in activity were observed in the fMRI study of ...
Summary of Cytokine Activity Summary of Cytokine Activity
Metabolic activation of a carcinogenic polycyclic aromatic hydrocarbon Metabolic activation of a carcinogenic polycyclic aromatic hydrocarbon
Long noncoding RNAs mediate transcriptional activation Long noncoding RNAs mediate transcriptional activation
Video: Sickle Cell Anemia

For a complete list of videos, visit our video library