Conceptually, one can define three generations of renewables technologies, reaching back more than 100 years .
First-generation technologies emerged from the industrial revolution at the end of the 19th century and include hydropower, biomass combustion and geothermal power and heat. Some of these technologies are still in widespread use.
Second-generation technologies include solar heating and cooling, wind power, modern forms of bioenergy and solar photovoltaics. These are now entering markets as a result of research, development and demonstration (RD&D) investments since the 1980s. The initial investment was prompted by energy security concerns linked to the oil crises (1973 and 1979) of the 1970s but the continuing appeal of these renewables is due, at least in part, to environmental benefits. Many of the technologies reflect significant advancements in materials.
Third-generation technologies are still under development and include advanced biomass gasification, biorefinery technologies, concentrating solar thermal power, hot dry rock geothermal energy and ocean energy. Advances in nanotechnology may also play a major role.
Complete question:
Knowledge of the amino acid sequences is important for several reasons. What is NOT one of those reasons
- Amino acid sequences determine the three-dimensional structures of proteins.
- Knowledge of the sequence of a protein can help to prevent mutations.
- The sequence of a protein reveals much about its evolutionary history.
- The sequence of a protein is necessary to determine its function.
Answer:
Knowledge of the sequence of a protein can help to prevent mutations.
Explanation:
<em>Amino acids connect to each other by peptidic bonds </em>to form a <em>linear polymer</em>. The number of amino acids composing the chain and the order in which they are arranged determines the primary structure of the protein.
The secondary structure is the folding that the polypeptide chain adopts thanks to the formation of <em>hydrogen bonds between the atoms that form the peptide bond.</em>
<u>Protein functions depend on their aminoacids sequences</u><u>.</u> <u>The primary structure of the proteins determines the three-dimensional one</u>. Proteins with different functions have different sequences. And among species, proteins with similar functions have similar structures.
By knowing the sequence of amino acids, we can predict the function of the protein and we can classify them into different families. Integrants of these groups have at least 25% of their sequences identical to each other.
Also, the knowledge of the sequence allows establishing evolutionary and genetic relationships between different species.
When a mutation occurs in the sequence -an alteration in the primary structure- the protein function is modified. BUT knowing the sequence of a protein CAN NOT help to prevent mutations.
Answer:
So, the correct option is 'The causative HIV retrovirus reduces the number of T-helper lymphocytes'.
Answer:
Both electric and magnetic field are conservative forces.
Both obey inverse square law.
Both are non contact forces (Forces can be exerted without contact).
Both are attractive as well as repulsive (Like poles repel, like charges repel; unlike poles attract, unlike charges attract).
Explanation:
Answer:
D) 100 acres
Explanation:
gazelles typically frequent wide open plains and space where they browse on grasses shoots and leaves. open plains make them visible to predators such as cheetah or wild dogs but gazelles are fleet of foots. the Thomson's gazelles can reach a speed of 40 miles an hour. some gazelles population eschew the grasslands for mountainous landscape or even deserts. during the dry season some grassland gazelles will even take to the bush of africa in search of water
