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enyata [817]
3 years ago
5

When a virus invades the body, some B cells recognize it as nonself and produce plasma cells that release a substance to kill th

e virus. What is this substance called?
Biology
2 answers:
Serga [27]3 years ago
3 0
Plasma cells are designed to churn out Antibodies. These are proteins that have a variable region which is complementary ( perfect shape fit) for the virus' antigen and can therefore bind to the antigen, making the virus harmless or tagging it to be consumed by a phagocyte.
Mila [183]3 years ago
3 0
When a virus invades the body, some B cells recognize it as non-self and produce plasma cells that release a substance to kill the virus. These plasma cells are called antibodies. This substance is also called as immunoglobulins.
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Select the correct answer. Which statement correctly explains the polarity of the water molecule? A. The hydrogen end of the mol
Nuetrik [128]

Answer:

option B) The oxygen end of the molecule has a partial negative charge and the hydrogen end has a partial positive charge.

Justification:

The electronegativity of an element accounts for its relative ability to attract electrons.

Being oxygen more electronegative than hdyrogen (the electronegativity of oxygen is 3.44 while the electronegativity of the hydrogen is 2.20), the electron density will be displaced toward the oxygen, letting it with a partial negative charge and the hydrogen with a partial positive charge.

Finally, since the charge is not symmetrical distributed around a center of the molecule, the molecule ends being polar.

7 0
2 years ago
Of the answers below, what is the smallest nucleotide sequence that could code for a protein with 300 amino acids?
ololo11 [35]
The nucleotide sequence would have to have 900 nucleotides in order to code for a protein of 300 amino acids. When translating RNA into proteins, RNA is read 3 bases at a time. Each group of 3 bases is a codon, and each codon codes for an amino acid. When read, the proper amino acid is added to a growing chain of amino acids, which will be folded to become a protein.

Therefore, 300 amino acids * 3 nucleotides per amino acid = 900 nucleotides.
6 0
3 years ago
Compared to other receptors, what makes steroid hormone receptors unique?
Dafna11 [192]

Answer: b)Steroid hormone receptors are located within the cytoplasm of a cell.

Explanation: Steroid hormones are the element present in the body that provides management in inflammation, metabolism, illness resistant , improves immune function etc. They are obtained from the cholesterol. The particular receptors of the steroid hormone is located at the cytoplasm.

Other options are incorrect because steroid hormone binds the certain receptors only not neurotransmitters .It does not have domain of 20 trans-membrane and is bound to ligand for activation.Thus , the correct option is option(b).

6 0
3 years ago
Can y’all please help
sashaice [31]

Answer:

11) A. The optimum pH of an enzyme is 6.6

12) C. A control group

3 0
3 years ago
If an enzyme is added to a chemical reaction, it will do what?
Nana76 [90]
<h2>Answer:</h2>

Option C is correct.

C. lower the activation energy so the reaction rate will increase

<h2>Explanation:</h2>

Enzymes are protein molecules in cells which work as catalysts. Enzymes speed up chemical reactions in the body, but do not get used up in the process. Almost all biochemical reactions in living things need enzymes. With an enzyme, chemical reactions go much faster than they would without the enzyme.

4 0
3 years ago
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