1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
mr_godi [17]
3 years ago
8

How do the cells in a blastocyst change as it becomes an embryo

Biology
1 answer:
Zarrin [17]3 years ago
5 0
1. Passage of a sperm through the corona radiata of the oocyte.
2. Penetration of the zona pellucida.
3.Fusion of the plasma cell membranes of the oocyte and sperm. after fusion the sperm head and tail enters the oocyte but plasma membrane of sperm doesn't.
4. Completion of the second meiotic division of the oocyte. this creates female pronucleus and polar body 2.
5. Formation of the male pronucleus (nucleus of sperm enlarges)
6. Breakdown of the pronuclear membranes and restoration of diploid number of chromosomes.
You might be interested in
Describe the difference between a chemical and physical change
Drupady [299]

Answer:

A physical change effects a substance physically. Examples include cutting, bending, dissolving, freezing, boiling, and melting.

A chemical change effects a substance chemically. Examples include burning, rusting, and digesting.

Hope this helps.

8 0
3 years ago
What is the molecule in this image?
Ratling [72]

Answer:

Protein.

Explanation:

In the image above, we see a molecule that is made up of several amino acids. The molecule that is made up of amino acids is protein.

Proteins are the most abundant organic macromolecules in cells, fundamental to cell structure and function. They are found in all cell types and viruses.

They are formed by amino acids linked together and joined by peptide bonds, as shown in the image above.

Of extremely high molecular weight, proteins are composed of carbon, hydrogen, nitrogen and oxygen, practically all of them have sulfur. Elements such as iron, zinc and copper may also be present.

All proteins are made up of a set of 20 amino acids, arranged in varying specific sequences.

3 0
3 years ago
Please help fill in the blank with each letter of the definition i need help
VMariaS [17]

Answer:

frequency✧C

wavelength✧A

wave speed✧D

wave period✧E

amplitude✧B

i'm not sure if they are all correct so sorry ✧

5 0
3 years ago
In humans a gene that has been identifoef as causing a type of skin cancer is the
Gennadij [26K]
It Is The Melanoma Gene .
4 0
3 years ago
Which of the following is an example of an ABAB design? Half of the subjects receive one treatment and the other half are not tr
Karolina [17]

Answer:

Option D, A subject is observed both before and after two exposures to the treatment.

Explanation:

In A-B-A-B design the alphabets have following meaning

a) First A – It is the baseline value or the value measured before treatment

b) First B – It is the treatment measurement

c) Second A  - It is the withdrawal of treatment  

d) Second B – It is the reintroduction of treatment  

The second A is known as the reversal phase in which the intervention is withdrawn to see if the target behavior returns to the baseline behaviour

Thus , there are two measurements involved one before the intervention and second after the intervention

Option D is correct

4 0
3 years ago
Other questions:
  • Because plants do not have skeletons, what accounts for their rigidity?
    7·1 answer
  • The ________________ is a passageway for both air and food to travel. MULTIPLE CHOICE.
    6·1 answer
  • Compare the distribution of mitochondria in the four organs, or organ parts, shown in the graph.
    14·1 answer
  • Which units represent density? Select all that apply.
    12·2 answers
  • Did michelle obama make any major mistakes or bad decisions?
    15·1 answer
  • Help me please, I'm dying here
    10·1 answer
  • Elizabeth has always believed that people’s thoughts can help heal them. She wants to help people use positive thinking to posit
    10·1 answer
  • Consider the skeleton.
    14·1 answer
  • Why does an increasing population cause
    8·1 answer
  • 3. Which of the following statements is NOT true about birds?
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!