An example of an endergonic reaction is A. Breaking down ATP into ADP and P. B. Breaking a protein down into amino acids. C. Polymerizing a protein from amino acids. D. Breaking down glucose (using oxygen) to make CO2 and H2O.

C. Polymerizing a protein from amino acids.

Explanation:

The polymerization of a protein from amino acids is an endergonic reaction. In such reactions, energy is used to drive chemical processes.

An endergonic reaction is a reaction in which energy must be supplied to make it happen.

In an exergonic reaction is a spontaneous reaction that can occur without the input of energy.

fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

explanation:

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.