A protein exists in two forms that differ only in their folded shapes. Form A is found in normal brain tissue and performs normal cellular processes. Form B is found in animals with certain brain diseases and is thought to play a
causative role in these diseases. Form B is infectious, meaning that when it is introduced to normal brain tissue, it can
cause Form A to be converted to Form B, thereby increasing the amount of the disease form.
Based on this information and your knowledge about biology, select true or false for each of the following
statements.
True
False
Form A and Form B must be expressed from two different genes.
в
я
Form A and Form B folding are determined entirely by their amino acid sequences.
Form A likely functions differently than Form B because they have different shapes.
Form A to Form B conversion likely requires a change in Form A's amino acid sequence.

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."    

they dont have any evidence