6. You discover a new transmembrane ion channel and upon structural characterization you demonstrate that it is a homo-tetramer, in which each subunit possess 2 transmembrane a- perpendicular to the plane of the membrane and 20 amino acid residues are embedded in the lipid bilayer. a. Estimate the thickness of the membrane lipid bilayer. b. If the homotetramer has MW of 70 KDa, what percent of its mass would reside in the membrane-spanning portion? c. Upon conformational change one of the two helices in each subunit tilts to 45 degrees within the membrane in respect to the plane. How many amino acids in this helix are embedded in the membrane after the transition? d. What percent of the ion channel mass reside in the membrane-spanning portion after the conformational change occurs? e. Transmembrane pores and channels can also be formed by proteins that form B-barrel structures. B-barrels are constituted by ß-strands that spans the entire membrane. Assuming that these B-strands are perpendicular to the plane of the membrane, how many residues must a B-strand have to span the lipid bilayer? "
Plant Structure and Growth
Roots anchor, the plant, ingest minerals and water, direct water and supplements, and store food. These are two kinds of root frameworks.
Plant Life Cycle
Plants are part of the PLANT KINGDOM, which is one of the five kingdoms of life. Plants are divided into smaller classes based on common characteristics. Certain characteristics are shared by all plants. They are made up of a large number of cells. They also make their own food through a chemical process called photosynthesis, which involves the use of water, carbon dioxide, and solar energy. They pump life-giving oxygen into the air as a by-product.
Life Cycle of Plants
All the organisms that belong to the Kingdom Plantae are known as plants. They are multicellular and eukaryotic and can synthesize their food by photosynthesis, known as autotrophic organisms. They are classified based on certain characteristics, such as the plants bear flowers; some have only naked seeds and do not contain flowers. Some plants neither have seeds nor flowers, such as ferns and mosses.
Plant Morphology and Anatomy
The study of life and organisms is biology. The cell is recognized as the basic unit of life by biology. From ancient Greek, biology is recognized. Modern biology deals with the recent developments in Science.
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