Do you have the answer choices ?
Answer:
In this case, it is likely that the polypeptide chain assumed an alpha helix configuration because the lipid bilayer did not have beta-barrel proteins.
Explanation:
A polypeptide chain is naturally polar, however, a lipid bilayer is naturally non-polar. This makes it difficult and even prevents the polypeptide chain from crossing a lipid bilayer, since the composition of these two elements does not allow them to mix. In that case, the polypeptide chain has two options to take to successfully cross the lipid bilayer.
The first option that the polypeptide chain has is to allow the creation of twisted beta sheets in the shape of a closed barrel in its structure. This only works if the lipid bilayer has beta barrel proteins in its composition to act as a transport channel for the polypeptide chain. However, few lipid layers have this protein.
Most likely, the polypeptide chain assumes an alpha helix conformation to cross lipid bilayers that do not have beta-barrel proteins. By assuming the beta conformation, the polypeptide chain reinforces the hydrogen bonds present in its composition, allowing it to cross the lipid bilayer without having its conformation and structure disassembled.
1. heredity
2. gametes
3. law of segregation
4. law of independent assortment
5. allele
6. genotype
7. phenotype
8. traits
The property of Henrietta Lack's cells that was most unusual when they were grown in the laboratory was that THEY CONTINUE TO DIVIDE AND MULTIPLY AFTER DECADES OF CULTURING.
Henrietta Lack's cells refers to the sample of cancerous cells that were extracted from a cancer patient named Henrietta for examination in the laboratory. The cells were cultured in the laboratory and they were used for research purposes. One surprising thing that scientists discovered about the cells is that the cells have the ability to continuously divide and multiply even many years after extracting them from their source.<span />
Answer:
The correct answer would be the pulmonary vein and the superior vena cava.
Pulmonary vein is a blood vessel of pulmonary circulation which carries oxygenated blood from lungs to the left atrium of the heart. Hence, it is rich in oxygen and carries carbon dioxide in the least amount.
In contrast, vena cava is a part of systemic circulation and carries deoxygenated blood from the body to the right atrium of the heart. They are two venae cavae in human beings namely; inferior vena cava (carries blood from lower body) and superior vena cava (carries blood from head, arms and upper body). Hence, it contains maximum carbon dioxide and least oxygen.
