Answer:
true
Explanation:
In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.
Part A:
<span>If early conditions of primeval earth had ammonia, methane, hydrogen in its atmosphere, then it is possible that amino acids such as glycine, α-alanine, and β-alanine may have been spontaneously formed from chemical reactions spurred by energy from lightning.</span>
<span>Their hypothesis was that the early conditions of primeval earth favored the spontaneous formation of organic molecules, from inorganic precursors, that may have been the origin of life. This theory is called abiogenesis. </span>
Part B:
<span>Miller Urey put methane, ammonia, hydrogen gases in a glass flask and a pool of water at the bottom of the glass flask. The flask was heated moderately to simulate the hot conditions then. Sparks were also occasionally induced in the flask to mimic lighting. The flask was then cooled slowly to simulate cooling of earth over time.After one day, they found the presence of some amino acids (glycine, α-alanine and β-alanine) was discovered in the water in the flask</span>
For decades, scientists believed that the atmosphere of early Earth was highly reduced, meaning that oxygen was greatly limited. Such oxygen-poor conditions would have resulted in an atmosphere filled with noxious methane, carbon monoxide, hydrogen sulfide, and ammonia. As the Earth cooled down, most of the water vapour condensed and formed the oceans.
To date, there remain widely held theories and studies of how life on Earth may have been built out of this deadly atmosphere cocktail.
Keratoacanthoma: a clinically distinct variant of well differentiated squamous cell carcinoma.
What is squamous cell carcinoma?
Squamous cell carcinoma (SCC) of the skin is the second most prevalent type of skin cancer, distinguished by aberrant, rapid squamous cell proliferation. Most SCCs are treatable if detected early.
Skin squamous cell carcinoma is also known as cutaneous squamous cell carcinoma (cSCC). Adding the word "cutaneous" distinguishes it as a skin cancer from squamous cell malignancies that can form inside the body, such as the mouth, throat, or lungs.
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Cholinergic
Both sympathetic and parasympathetic preganglionic neurons are cholinergic, meaning they release acetylcholine (Ach) at the synapse in the ganglion.
