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
Which of the following connects the right and left hemispheres of the brain, allowing communication between
nexus9112 [7]
Corpus callosum will be your answer
6 0
3 years ago
Examination of a sandstone outcrop reveals an abundance of feldspar and quartz grains. Could this weathered material have come f
Inga [223]
Basalt is the usually hard and black volcanic rock formed from (liquid) balsalitc lava
5 0
3 years ago
List and describe the role of the 3 types of rna.
steposvetlana [31]

<span>There are three RNAs with a role in the synthesis of protein.</span>

mRNA, or messenger RNA, is the link between a gene and a protein. The main role of this ribonucleic acid is in transcription (”reading“) of DNA. The DNA is transcribed by RNA polymerase, and the resulting product of this process is mRNA. This form of RNA can be modified post-transcriptionally with methylguanosine caps and polyadenosine tails. RNA carries the genetic information which is copied from DNA and the information has a form of three-base code (“words”), codons. Each of these codons specifies a particular amino acid.

tRNA or transfer RNA is the molecule with the main function in translation by "decoding" the mRNA message during this process. Each type of amino acid has its own type of tRNA and also has a three-base sequence (anticodon) that can bind complementary with the codons in the mRNA.

rRNA or ribosomal RNA is a main component of ribosomes. rRNA associates with a set of proteins to form ribosomes which catalyze the assembly of amino acids into polypeptide chains (protein).

 

<span>There are also a few more types of RNA which have a regulatory function like, microRNA or siRNA.</span>

4 0
3 years ago
What soil properties are influenced by microorganism activity?
BartSMP [9]

Answer: Microorganism activity affects soil acidity and the amount of organic matter in soil. It also affects the nutrient and mineral levels in soil as well as soil structure.

Explanation:

7 0
3 years ago
What is the powerhouse of the cell?
dangina [55]
Mitochondria is the powerhouse of a cell
8 0
3 years ago
Read 2 more answers
Other questions:
  • Huntington’s disease: Huntington’s disease is a disease in which certain parts of the brain waste away; symptoms usually begin l
    6·1 answer
  • A wildlife biologist suggests re-introducing the eastern cougar into southern Alabama, reasoning that besides bears, which can s
    5·1 answer
  • Question 1 (3 points) Question 1 Unsaved
    7·1 answer
  • How can a model be useful to a scientist?
    10·1 answer
  • You are so Brainly right now.
    14·1 answer
  • BIOLOGY DNA SECTION 1
    7·1 answer
  • Why is the circulatory system of insects not involved in the respiratory mechanism of insects?​
    12·1 answer
  • What precautions can you take at school to reduce the incidence of infection​
    8·1 answer
  • PMTA are the 4 stages of...
    8·1 answer
  • ______what is parthenogenesis______​
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!