Answer:
The nitrogenous bases guanine and adenine are A. purines.
Explanation:
Adenine and guanine are purines, whereas the other two bases in DNA (thymine and cytosine) are pyrimidines. The main difference between purines and pyrimidines is the number of rings that the base has: purines have two rings while pyrimidines only have one ring.
In addition, phosphate group and sugar group cannot be the answer to this question because these two elements in addition to a nitrogenous base makes up a nucleotide.
Hope this helps!
Atoms in molecules share pairs of electrons when they make ionic bonds.
The correct statements are:
1. The atmosphere interacts with the hydrosphere to redistribute water over the surface of the Earth;
2. The atmosphere interacts with several Earth spheres, including the lithosphere;
3. Wind from the atmosphere creates ocean waves and currents;
The atmosphere is one of the few spheres, and it is of crucial importance for the life on our planet, but also for the shape of the world, and redistribution of temperature. Any slight change in it affects the whole planet significantly, and that just proves its importance. It can be a blessing, and it can be a curse with its activity, but whichever way it is, it is part of the natural process of our planet.
Evaporation is a type of vaporization that occurs on the surface of a liquid as it changes into the gas phase. The surrounding gas must not be saturated with the evaporating substance. When the molecules of the liquid collide, they transfer energy to each other based on how they collide with each other
Cellular respiration<span> is the process cells use to make energy. Cells in our body combine glucose and </span>oxygen<span> to make ATP and carbon dioxide. </span>Cellular respiration <span>starts with glycolysis, where glucose enters the </span>cell<span>, is converted to pyruvate, and makes a few ATP and NADH.</span>
