The correct answer is option (D) Lipid molecules are nonpolar because they repel water molecules, which are polar.
Lipids are organic compounds made up of fatty acids and glycerol. A glycerol is a organic molecule with three hydroxyl groups and a fatty acid consists of a long hydrocarbon chain attached to a carboxyl group.
Lipids are hydrophobic, nonpolar molecules with no charge on their ends. Waxes are long chain nonpolar lipids. The water repelling property of the waxes prevent the water sticking to it and appear as water beads on its surface. The hydrophobic hydrocarbon tail of the fatty acids are hydrophobic in nature making them repel water. The presence of wax on the surface of the plants and animals protects them from dehydration.
Thus, the nonpolar property of lipids make it insoluble in the polar solvents like water as there is no interaction or sharing of electrons between them.
Answer:
The given statements have been rearranged in the following order to depict the flow of events that account for lipid digestion in the human body:
- Mechanical digestion by chewing breaks food down.
- During digestion, gastric lipases break down fat into fatty acids and triglyceride molecules.
- Gastric lipase digests some triglycerides.
- The pancreas secretes gastric lipase into the small intestine, where the majority of fat digestion occurs.
- Lipid digesting enzymes from the pancreas break down the triglycerides into two free fatty acids and a monoglyceride.
- Lingual lipase is secreted from the pancreas and breaks down triglycerides.
- With the aid of pancreatic lipase, fats are further broken down into free fatty acids and monoglycerides.
- Products of fat digestion are packaged into micelles and transported to the enterocytes.
The process is started in the mouth. Action of the teeth physically breaks down the food and increases it surface area that allows for better access to it for the enzymes to carry out mechanical digestion. Gastric lipases are those in the stomach, most of the lipid digestion takes place in the small intestine with the help of enzymes secreted by the pancreas and the small intestine itself. After digestion, the final products are taken up by the lymphatic system.
Hope that answers the question, have a great day!
Answer:
1/8 (12.5 %)
Explanation:
Cross: IAi X IAIB
F1: 1/4 IAIA 1/4 IAIB 1/4 IAi 1/4 IBi
Phenotypes:
- IAIA and IAi >> type A blood
- IBi >> type B blood
- IAIB >> type AB blood
Phenotypic frequency type A blood: 1/2 (i.e., 1/4 IAIA + 1/4 IAi) >>
Probability to have 3 offspring with type A blood: 1/2 x 1/2 x 1/2 = 1/8
The human ABO blood group is a system consisting of there different alleles: A, B, and O. This system is used in genetics as an example of codominance because both A and B alleles are expressed in heterozygous individuals (i.e., IAIB), whereas only the allele A is expressed in individuals that have A and O alleles (since O allele is recessive to the A and B alleles).
<span>in middle-aged populations, taking 1-2 drinks a day may benefit the heart</span>
<span>Teleromes provide a protective cap on the ends of linear chromosomes and are atypical to most prokaryotes, which are circular chromosomes. Teleromes also function as the gatekeepers to prevent topoisomerase enzymes from sliding out of the dna double-helix.</span>
