In which type of exercise would fat reserves be used to create atp? a strenuous, short hike with many steep climbs a moderate, but long hike over gently rolling hills

The right answer is the second option.

ATP is synthesizes in glycolysis, and through citric acid cycle.

In case of glucopenia (lack of sugars, after a long-term excerice), fat mobilization from adipose tissue is observed, followed by hydrolysis to fatty acids and glycerol.

Glycerol is used as a precursor in glucose recycling via gluconeogenesis: this accelerated gluconeogenesis requires energy.

Fatty acids are oxidized by beta-oxidation, pass through L-carnitine through the mitochondrial membrane (carnitine molecular shuttle) and via AcCoA into the citric acid cycle and even bring more energy that glucose burning but in the long run.

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:

i think it’s c but i might be wrong. if i am let me know! have a good rest of your day as well!