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sweet-ann [11.9K]
3 years ago
6

Which step happens first to a chromosome during cell division?

Biology
1 answer:
viktelen [127]3 years ago
5 0

Answer:

D

Explanation:2 DNA ms form

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What is a major problem with using foreign cells grown in culture for transplantation in humans?
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The major problem with using foreign cells grown in culture for transplantation in humans is the host immune system would destroy such cells.

The body of your child is shielded from external invaders by the immune system. These include poisons, bacteria, viruses, fungus, and other types of germs (chemicals made by microbes). The various organs, cells, and proteins that make up the immune system cooperate with one another. Infections like measles, mono (mononucleosis), and the flu virus can also temporarily impair immunity. Additionally, unhealthy eating habits, alcoholism, and smoking might impair your immune system.

Antigens, which are proteins on the surface of the invading cells, are used by the immune system to identify invaders. Every substance or cell has a unique set of antigens, and every person's cells include "self-antigens" that are particular to that person.

To know more about immune system refer to:  brainly.com/question/15975169

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1 year ago
I need help please i don’t understand
Oxana [17]
The answer is the first one ( it has more protons than electrons)
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Ecology help i am sick help with 1-17 tons of points I am very sick and my teacher gave me work
jeka94
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7 0
3 years ago
In dna methylation, which nitrogenous base is most frequently methylated?
Aloiza [94]
In DNA methylation, the most frequently methylated nitrogenous base is the cytosine. Its methylation is widespread in prokaryotes and eukaryotes. Its rate of DNA methylation differs greatly between different species like Arabidopsis thaliana which is 8%, Physarum, 4%, Mus musculus, 2.3%, and etc.
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Its called a substitution :)

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3 years ago
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