Answer:
In eukaryotes, nucleosomes play major roles in chromatin organization and gene expression
Explanation:
In eukaryotic organisms, chromosomal DNA is packaged with the help of proteins called 'histones' to form chromatin. The nucleosomes represent the basic packing units of the chromatin. Each nucleosome is composed of a histone octamer containing each two histones H2A, H2B, H3 and H4 wrapped around by 147 bp of DNA. Nucleosomes act as scaffolds to form higher-order chromatin structures (i.e., 30-nm chromatin fibers and condensed chromosomes). Moreover, nucleosome histone proteins can be chemically modified at defined amino acid residues, and thus nucleosomes also provide an epigenetic layer of information that can promote or inhibit gene expression.
In conclusion, Both 'mutation is the basis of evolutionary genetic change' and 'mutations prevent the proper functioning of a gene' are True, but R is not the correct explanation of A (Option A).
<h3>What are genetic mutations?</h3>
Genetic mutations are any type of modification in the genetic material (DNA sequence) of an organism.
Mutations provide the raw material for evolution, but mutation can be beneficial, deleterious, or neutral depending on the environment.
In conclusion, both statements are True, but R is not the correct explanation of A (Option A).
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Answer:
a therapist
Explanation:
a therapist can perscribe medication to a patient that can alter the hormone levels in the brain that control the anxiety response
<h2>Answer:</h2>
Salivary amylase breaks the chemical bonds of starch to form sugar monomers.
<h3>Explanation:</h3>
- Amylase is one of the digestive enzymes which catalyze the breakdown of starch molecules into its monomers.
- A starch molecule is made of the Glucose molecules which are bonded with each other with glycosidic linkages.
- Salivary glands secrete saliva into the mouth cavity.
- Saliva contains amylase for the digestion of starch are known as salivary amylase.
- Steps in the digestion of sugars start from the action of this enzyme.