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hram777 [196]
3 years ago
7

Which of these are the main working cells of the specific immune response? A) histamines and interferons, B) antigens and antibo

dies, C) B cells and T cells, D) self and nonself cells
Biology
1 answer:
Debora [2.8K]3 years ago
7 0
C) B and T cells are specific or adaptive immune response
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A total of _____ amino acids compose the majority of protein in living things and nine are _____ to human
Evgen [1.6K]

A total of <u>20</u> amino acids compose the majority of protein in living things and nine are <u>essential</u> to human.

  • All living organisms, from bacteria to people, depend on amino acids for survival.
  • The same 20 types of amino acids are present in all living things.
  • Only 21 amino acids are required by the human body to create all the proteins required for growth and function.
  • Your body can create thousands of different types of proteins with only the same 21 amino acids because they can be ordered in a wide variety of ways.
  • The body is unable to produce essential amino acids. They must therefore originate from food.
  • Histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine are the nine essential amino acids.

learn more about amino acids here: brainly.com/question/1201532

#SPJ4

8 0
2 years ago
What kind of bonding occurs between carbon atoms, allowing carbon to form stable molecules?
brilliants [131]

Answer:

The correct answer is single,double and triple covalent bonds .

Explanation:

A carbon atom can form a single bond with another carbon atom example ethane.

A carbon atom can form a double bond with another carbon atom example ethylene

A carbon atom can form a triple bond with another carbon atom example acetylene.

 But during the formation of  Carbon carbon single bond or double bond or triple bond the valency of carbon atom that is 4 is always maintained.

5 0
4 years ago
In what way is sedimentary rock formation in nature like a sieve?
Anna11 [10]
<span>B. Rocks go through many stages during their formation</span><span>

Sedimentary rocks together with the igneous rocks and the metamorphic rocks are the three main types of rocks that existed on earth. It is formed or made accordingly into four major ways. First, it is formed by depositing weathered remains of "clastic sedimentary rocks" or other rocks. Second, is through accumulation and the consolidation of sediments, thirdly is by depositing the results of biogenic activity and lastly it is formed through precipitation from solution. Limestone, shale, chalk clay and others are best examples of sedimentary rocks. </span>
6 0
3 years ago
Read 2 more answers
Martha is telling her teacher how an animal cell is like a house. Which part of the animal cell is like the doors and windows in
Elina [12.6K]
Cell membrane is like doors and windows!!

if you know how; comment !
4 0
3 years ago
Bacteria perform the following ecological roles. Which role typically does not involve symbiosis?
xz_007 [3.2K]

Answer: Decomposer

Explanation:

Bacteria feed on the dead and decaying organism, in which they feed on them and obtain energy from them.

It is not a mutual relation because the host cell on which they feed is not alive. They eat the organic matter that is present in environment.

The bacteria and fungi clean the environment in this way. The dead plants and animals are decomposed in the environment and the nutrients get back  into the soil.

hence, the correct answer is option B

7 0
3 years ago
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