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Rudiy27
3 years ago
10

Can anyone help? I’ll give brainliest!! :)

Biology
1 answer:
Allisa [31]3 years ago
4 0

Answer:

plasma gun and kfc

Explanation:

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What types of antigen do T cells NOT recognize? What types of antigen do T cells NOT recognize? self-antigens bacterial antigens
Stolb23 [73]

Answer:

Self-antigens are not recognized and attacked by the T cells.

Explanation:

In immunology, the antigens are those substances which are bound by the antibodies. The antigens can be originated from within the bodies, known as self antigens or from outside the body, known as non-self antigens. The immune system identifies and attacks non-self invaders or the foreign harmful objects present in the body. It does not attack the self-antigens under the normal conditions. This is due to the negative selection of T cells of the thymus.

4 0
3 years ago
Explain why life on land was difficult for early plants
kicyunya [14]
Because the soil didn't have the same nutrients it has now due to lack of decomposition of other plants and animals.
8 0
3 years ago
An organism's genome is analyzed and found to contain 18% guanine. What percentage of that organism's DNA is adenine?
Oxana [17]

Answer:

32%

Explanation:

According to Chargaff in his complementary base pairing rule, he stated that the proportion of purine and pyrimidine bases is equal to 100%

That is, A + T + G + C = 100%

Where A=T and G=C i.e the proportion of each base pair is equal.

Hence, if the Guanine content is 18%, it means the Cytosine content of that DNA molecule must also be 18%. Therefore:

18 + 18 + A + T = 100

A + T = 100 - 36

A + T = 64

If the sum proportion of Adenine and Thymine is 64% and each must contain equal proportions, A or T = 64/2 = 32

Hence, Adenine contains 32%, likewise Thymine.

6 0
3 years ago
Elements in group ________ are common alkaline earth metals. <br> Answer ?
omeli [17]
The answer is:  "2A" or "IIA" or "2" or "II"; 
___________________________________
In which "II" stands for the Roman numeral representing the number: "2 (two)".
________________________________________________________
3 0
3 years ago
Most familiar life forms live in regions of biomes that humans inhabit. <br> True or false
lesya [120]

true

we will take cows as an example, they inhabit earth and so do we as humans. we as humans put the on our farms and our grass lands. we give the cows a biome. so that makes the statement true.

tell me if I am wrong. :)

7 0
3 years ago
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