Answer:
The R chain gives an amino acid its unique identity
The hydrogen, carboxyl and amine groups are similar parts of all amino acids.
Explanation:
Amino acids are building blocks of protein molecules. They are 20 amino acids in nature, however, these amino acids are similar in structure but differ in the possession of different side chains, also called R chain.
- All amino acids have in their structure a hydrogen group (-H), an amino group (-NH2) and carboxyl group (-COOH). All these are attached to one carbon atom called the CENTRAL CARBON in the structure.
- A fourth group called "R chain" exists in the amino acid structure that differentiates all amino acids. This means that no two amino acids have the same R chain side group. For example, Alanine has a methyl group (-CH3) as its R side group while Glycine has hydrogen (-H) as its.
<span>Large changes in allele frequencies can occur in a short time.
I'm taking the test now and that's what I know.</span>
Answer:
Some bacteria due to their structures and physiology are inherently resistant to some antibiotics. This could be due to lacking transport mechanism or lacking receptor sites. Bacterium develop resistance mechanisms by using instructions provided by their DNA. Resistance genes are often found in plasmids which are small pieces of DNA that carry genetic instructions from one germ to another. Meaning that some bacteria can share their DNA and cam make other germs become resistant.
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The condition in which the body immune system is completely failed to resist any sort of pathogen is called AIDS.
Our immune system is consist of cells proteins and organs which are involve in our immune system. When any component is failed to perform it’s function then it leads to AIDS.
AIDS refers to the last stage of destruction of lymphocytes.
The causual agent for aids is HIV(human immuno deficiency virus).
There are many lines of evidence which clearly show that the atmospheric CO2<span>increase is caused by humans. The clearest of these is simple accounting - humans are emitting CO2 at a rate twice as fast as the atmospheric increase (natural sinks are absorbing the other half). There is no question whatsoever that the CO2 increase is human-caused. This is settled science.</span>
