Biology, 12.03.2020 03:02 ashantajohnson6810
Which of the following statements are fundamental to the clonal-selection theory of how the adaptive immune system functions? I) Each lymphocyte has a unique membrane receptor that recognizes one antigen. II) When the lymphocyte binds an antigen, it is activated and begins dividing to form many identical copies of itself. III) Cloned lymphocytes have slight differences and are selected by the spleen for removal if they do not bind an antigen. IV) Cloned cells descend from an activated lymphocyte and persist even after the pathogen is eliminated.
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Biology, 22.06.2019 15:00
Pls me i need this ! each cell has genes activated depending on it's job and what kind of cell it is. it is the presence of that causes the repressor protein to fall off and unblock the gene on the lac operon. if a gene is turned on then it is being an additional circular chromosome found in some bacteria that is used in genetic engineering.
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Biology, 22.06.2019 20:30
The backbone of the double helix has an alternating molecules. what do you call these alternating molecule?
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Biology, 22.06.2019 22:30
Astudent wants to compare the amounts of co2 given off by yeast provided with different amounts of sugar. the student places a balloon over each container to catch the released co2. which observation is a qualitative observation the student can make?
Answers: 2
Biology, 22.06.2019 22:50
Below are the three main organs that make up the plant body
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Which of the following statements are fundamental to the clonal-selection theory of how the adaptive...
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