<span>Jul 7, 2008 - Ok, this includes "hierarchy structural levels biology." Principles in Biology ... What is the highest level in life's structural hierarchy? - Yahoo .</span><span>The structure of living organisms including those of entire populations and ... is life?'. In the biological sciences, the following hierarchical levels are recognized: ...</span><span>
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The correct answer is: B) G1
Normal cells (unlike cancer cells), move through the cell cycle in a regulated way in order to make sure that cells don't divide under conditions that are unfavorable for them. Information about their own internal state (nutrients, signal molecules, DNA integrity) is signal to go or not to go through the cell division. Because of that there are few checkpoints in the cell cycle at which the cell examines the signals and makes a “decision”. The major checkpoints are:
• The G1- the first point at which it must choose, once it passes the G1 checkpoint the cell enters S phase
• The G2-the cell checks DNA integrity and checks if replication is done well.
• The spindle checkpoint-at the transition from metaphase to anaphase.
The main function of cholesterol in our brain is that it initiates information synthesis and it also involved in excretion of glands. In addition, it signals the central nervous system when a new memory or knowledge is acquired although if it exceeds would cause mental disorders like Alzheimer's.
Answer:
Options 1, 3 and 4.
Because most newly synthesized proteins fold correctly, the accumulation of misfolded proteins (or fragments) tends to occur slowly, thus explaining the slow onset of disease.
An amyloid fibril is stabilized by hydrophobic interactions between aromatic residues.
4) Soluble proteins that misfold and form amyloid fibrils become insoluble.
Explanation:
Amloid fibrils are peptide or proteins that are formed during invivo or invitro conditions. They ate formed when soluble proteins combine together to for insoluble fibres that are resistant to degradation. They are found in extracellular tissues and posses pathological effect. They accumulate after nerve cells and causes several illness.
An amyloid fibril is stabilized by hydrophobic interactions between aromatic residues.
4) Soluble proteins that misfold and form amyloid fibrils become insoluble.
An amyloid fibril is stabilized by hydrophobic interactions between aromatic residues.
Soluble proteins that misfold and form amyloid fibrils become insoluble.
