<span>Answer:
Think of DNA-there are only 4 bases, but different combinations give infinite possibilities.
And the same for amino acids and proteins.
Immunoglobulins work on a similar principle. Different VDJ segments are combined for the heavy chain of an antibody. Different VJ segments are combined for the light chain.
Other ways:
Random nucleotides may be added or removed between the gene segments.
There are also different combinations of light and heavy chains.
Antibodies can be any of the 5 isotypes: IgA, IgM, IgG, IgE, IgD.
I'm not going to go into detail as this answer would take too long to write. Do some literature searching on B cells, V(D)J recombination, RAG genes, class switching.</span>
Answer:
<u>Answer:</u> process and facts, because they are using a systematic method to measure and then record data
Explanation:
During a study of lichens and air quality in part of China, scientists measure the thickness of lichens and estimate how many rocks and trees are covered with lichens in one town. The scientists are following the scientific cycle of observing while <u>using a systematic process, establishing facts, explaining facts, and then returning to the systematic process to collect more facts.
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When scientists carefully measure the lichens and agree on their average thickness and how often they appear, which parts of the scientific cycle are the scientists using?
<u>Answer:</u> process and facts, because they are using a systematic method to measure and then record data
Chloroplast is an organelle, having chlorophyll pigments in them. These pigments trap light energy to support photosynthetic reaction. Chloroplast are specific to plant cell because plants are the autotrophs which can prepare their own food by conversion of light energy to chemical energy.
