Cantidad de puentes de hidrógenos formados entre la Guanina y Citosina que permite el cierre de las cadenas del ADN

tres puentes de hidrógeno

Explanation:

El acido desoxirribonucleico (ADN) es una molécula compuesta por dos hélices antiparalelas las cuales interaccionan entre sí a través de puentes de hidrógeno entre bases nitrogenadas. Existen dos clases de bases nitrogenadas: 1-purinas (Guaninas y Adeninas) y 2-pirimidinas (Timina y Citosina). En la doble hélice, la Adenina (A) siempre aparea con Timina (T) a través de dos puentes de hidrógeno, mientras que la Citosina (C) siempre interactúa con Guanina (G) a través de tres puentes de hidrógeno, es decir un enlace de hidrógeno más por cada par de bases. Es por esta razón que una molécula de ADN con alto contenido GC es más estable y por lo tanto tiene una temperatura de desnaturalización mayor.

1: most common garden plants prefer loam — soils with a balance of different-sized mineral particles (approximately 40% sand, 40% silt, and 20% clay) with ample organic matter and pore space. however, some plants grow better in sandy soils, while others are well-adapted to clay soils.

2: available water capacity is the maximum amount of plant available water a soil can provide. it is an indicator of a soil's ability to retain water and make it sufficiently available for plant use. available water capacity is the water held in soil between its field capacity and permanent wilting point.

3: it is the same for all living things (plants and animals). it also includes very tiny organisms that our eyes cannot see. they are known as microorganisms, and include viruses, bacteria and fungi.

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.