3.-De las siguientes células humanas, ¿cuál de ellas tieneuna dotación 2n= 46? A) Espermátida.
B) Espermatogonio.
C) Espermatocito secundario.
D) Primer cuerpo polar.
E) Segundo cuerpo polar.
#PSU

dna is made up of six smaller molecules -- a five carbon sugar called deoxyribose, a phosphate molecule and four different nitrogenous bases (adenine, thymine, cytosine and guanine).

the correct answer is b

energy and particles

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.