Question: Describe how a single amino acid substitution causes hemoglobin molecules to stick together. Use what you know about the structure of Hb and HbS, the properties of glutamic acid and valine, and how hydrophobicity causes molecules to behave in water.
Answer:
A Single amino acid must be polar to attract, just like water.
Explanation:
Sickle cell is an genetic illness and it is began by a alteration that arises in the beta sub units of the haemoglobin. Haemoglobin is a tetrameric protein made up of 2 alpha sub units and 2 beta sub units and it is the important part of the blood accountable for oxygen passage. Sickle cell is a illness that consequences from a replacement of a polar amino acid identified as glutamate with a non polar one valine at site six of the beta polypeptide component of haemoglobin. The replacement occurs as a consequence of a alteration in one of the bases in the beta-globin gene from adenine to thymine . As a outcome of this change, the beta polypeptide chains convert sticky in low oxygen circumstances since the valine sticks out of the chain and interrelates with neighboring non-polar amino acids.
A jellyfish is a heterotroph, it gets energy from eating, autotrophs produce their own energy
Answer: The correct answer would be corpus albicans.
Explanation:
After ovulation, the ovarian follicle converts into corpus hemorrhagicum. After some time, it converts into a temporary endocrine structure termed as corpus luteum. It maintains high levels of progesterone which is necessary for maintenance of uterus lining.
However, in absence of pregnancy or fertilisation, the corpus luteum starts degrading and convert into the structure termed as corpus albicans.
Through the process of photosynthesis, carbon dioxide is pulled from the air to produce food made from carbon for plant growth.
Answer:
directional selection, is a mode of negative natural selection in which an extreme phenotype is favored over other phenotypes, causing the allele frequency to shift over time in the direction of that phenotype.
